Testosterone is the primary male sex hormone, responsible for the development of male sexual characteristics and maintaining functions such as sexual health, muscle mass, bone density, and mood. It’s produced mainly in the testes and regulated by the pituitary gland. As men age, their testosterone levels naturally decline, and maintaining balanced testosterone is essential for overall health.

Why is testosterone important?

In men, testosterone regulates sex drive (libido), bone mass, fat distribution, muscle mass and strength, and the production of red blood cells and sperm.

Low testosterone can lead to fatigue, muscle loss, and decreased libido, while high testosterone (especially due to steroids or tumors) can have negative effects on health. Testosterone also helps maintain mood and energy levels. Men with low testosterone often report symptoms like irritability, depression, or difficulty concentrating, which can affect their quality of life.

How can I better understand my testosterone levels?

Total testosterone quantifies, as the name suggests, the overall quantity of testosterone including molecules that are both free (unbound) and bound to proteins (mainly SHBG and albumin).

Total testosterone ranges vary based on many factors, including age.

Normal total testosterone in males:

• Age 20-49: 3.0 – 10.8 ng/mL
• Age 40-60: 3.0 – 8.9 ng/mL
• Age 60+: 3.0 – 7.2 ng/mL

SiPhox Ranges:

Testosterone, like many hormones, follows a diurnal rhythm, peaking in the morning and dipping in the early evening. Peak secretion occurs between 7 and 10 a.m., which is why testing testosterone levels in the morning helps to limit variations, particularly in younger men.

Low testosterone is more likely to affect those who are older, obese, have type 2 diabetes or HIV/AIDS, have sleep apnea, or have chronic conditions such as kidney or liver dysfunction. Since abnormally high or low testosterone levels may indicate problems with the testicles, pituitary gland, or hypothalamus, it is important to consult with your physician if you are concerned about your levels.

How can I maintain optimal testosterone levels?

If you need to maintain or adjust your testosterone levels, consider the following strategies:

Dietary Changes:  A diet rich in lean proteins, healthy fats, antioxidant-rich foods, and hormone-supporting herbs like ginger and turmeric can support testosterone regulation. Including honey can help to increase lower testosterone levels. Research suggests that macronutrient, vitamin, and mineral intake can impact testosterone synthesis. Zinc-containing foods like oysters and pumpkin seeds can also regulate testosterone.

Lifestyle Changes: Avoiding chronic stressors, getting more and higher-quality sleep, and lowering abdominal fat percentage through a healthy regimen can help in improving testosterone levels. Additionally, engaging in regular physical activity, including strength training and aerobic exercise, can help support hormone balance, muscle strength, and overall well-being. Practicing stress-reducing techniques such as mindfulness, meditation, deep breathing exercises, and adequate sleep can also help support hormone balance and overall health.

Supplementation: Supplements like fenugreek seed extract, ashwagandha roots and leaves, and  saw palmetto or boron can help to increase lower testosterone levels. Adequate zinc intake has also been shown to regulate both elevated and decreased hormone levels, including testosterone.

Where can I learn more?

• Andrew Huberman has a masterclass on testosterone for males.
• Harvard Medical School – Testosterone: What It Is and How It Affects Your Health
• Cleveland Clinic – Testosterone

DISCLAIMER: IF YOU ARE CONCERNED WITH ANY OF YOUR RESULTS, PLEASE CONSULT WITH YOUR PHYSICIAN.

While testosterone is a hormone primarily associated with male development and reproductive function, it is also present in females. Testosterone in females is an androgenic hormone produced in small amounts by the ovaries and adrenal glands. It plays a vital role in maintaining bone density, muscle mass, sexual function, and overall energy levels. While women have much lower testosterone levels than men, this hormone is still essential for health and vitality.

Testosterone also serves as a precursor to estrogen, which plays a significant role in the menstrual cycle and reproductive health.

Why is testosterone important?

Testosterone supports sexual desire, bone health, muscle strength, and mood in women. Low testosterone levels can contribute to fatigue, low libido, and muscle weakness, while high testosterone levels are associated with conditions like PCOS, leading to symptoms such as excessive hair growth, acne, and menstrual irregularities.

Proper testosterone levels are essential for maintaining optimal health, especially as women age.

How can I better understand my testosterone levels?

Total testosterone in females can vary depending on age, health status, and testing methods. Higher than normal testosterone levels in females, known as hyperandrogenism, may indicate conditions such as polycystic ovary syndrome (PCOS), adrenal disorders, ovarian tumors, or certain medications. Further evaluation, including additional tests and medical history assessment, may be necessary to determine the underlying cause. Lower than normal testosterone levels in females may result from conditions such as primary ovarian insufficiency (early menopause), adrenal insufficiency, pituitary disorders, or certain medications. Additional testing and medical evaluation are essential to identify the underlying cause and determine appropriate management.

How can I maintain optimal testosterone levels?

Maintaining balanced testosterone levels in women involves the following steps:

Dietary Changes: A diet rich in lean proteins, healthy fats, antioxidant-rich foods, and hormone-supporting herbs like ginger and turmeric can support testosterone regulation. Including honey can help to increase lower testosterone levels. Spearmint tea may reduce excess testosterone, especially in women with conditions like PCOS. Zinc-containing foods like oysters and pumpkin seeds can also regulate testosterone.

Lifestyle Changes:  Avoiding chronic stressors, getting more and higher-quality sleep, and lowering abdominal fat percentage through a healthy regimen can help improve testosterone levels. Additionally, engaging in regular physical activity, including strength training and aerobic exercise, can help support hormone balance, muscle strength, and overall well-being. Practicing stress-reducing techniques such as mindfulness, meditation, deep breathing exercises, and adequate sleep can also help support hormone balance and overall health.

Supplementation: Consuming saw palmetto or boron supplements can aid in increasing low testosterone in women. These supplements are not recommended in pregnancy or for individuals with kidney disease.

Where can I learn more?

• PubMed – Testosterone in Women
• Cleveland Clinic – Low Testosterone in Women
• Cleveland Clinic – Hyperandrogenism in Women

DISCLAIMER: IF YOU ARE CONCERNED WITH ANY OF YOUR RESULTS, PLEASE CONSULT WITH YOUR PHYSICIAN.

Free testosterone in females refers to the unbound portion of testosterone in the bloodstream, which is the biologically active form of the hormone. Although women produce testosterone in much lower amounts than men, it still plays a crucial role in maintaining sexual function, muscle mass, bone density, and overall energy levels.

Testosterone in females is primarily produced by the ovaries and adrenal glands. Even small fluctuations in free testosterone can have a significant impact on health, including symptoms such as low libido, fatigue, and muscle weakness.

Why is free testosterone important?

Free testosterone is crucial for sexual health, muscle maintenance, bone density, and overall vitality in women. It helps regulate libido, energy, and mood.

Low free testosterone can contribute to symptoms like low libido, fatigue, reduced muscle strength, and even depression. High levels, often seen in conditions like PCOS, can cause symptoms such as acne, excessive facial hair, and irregular periods.

How can I better understand my free testosterone levels?

Free testosterone is usually measured alongside total testosterone. Total testosterone includes both free and bound testosterone, but free testosterone is the active form that is available to tissues. Understanding the difference is important because a woman may have normal total testosterone but still experience symptoms of testosterone deficiency if their free testosterone levels are low.

Normal free testosterone levels for women can vary depending on age, health status, and menstrual phase.

Since testosterone levels vary throughout a woman’s life, with a decrease occurring after menopause, it is important to evaluate free testosterone levels in the context of a woman’s age and symptoms. Conditions like PCOS or adrenal disorders can lead to high free testosterone levels, whereas conditions such as ovarian insufficiency can cause low levels.

How can I maintain optimal free testosterone levels?

To maintain optimal free testosterone levels, consider these lifestyle and dietary strategies:

Dietary Changes: A diet rich in lean proteins, healthy fats, antioxidant-rich foods, and hormone-supporting herbs like ginger and turmeric can support testosterone regulation. Including honey can help to increase lower testosterone levels. Spearmint tea may reduce excess testosterone, especially in women with conditions like PCOS. Zinc-containing foods like oysters and pumpkin seeds can also regulate testosterone.

Lifestyle Changes:  Avoiding chronic stressors, getting more and higher-quality sleep, and lowering abdominal fat percentage through a healthy regimen can help improve testosterone levels. Additionally, engaging in regular physical activity, including strength training and aerobic exercise, can help support hormone balance, muscle strength, and overall well-being. Practicing stress-reducing techniques such as mindfulness, meditation, deep breathing exercises, and adequate sleep can also help support hormone balance and overall health.

Supplementation: Consuming saw palmetto or boron supplements can aid in increasing low testosterone in women. These supplements are not recommended in pregnancy or for individuals with kidney disease.

Where can I learn more?

• PubMed – Testosterone in Women
• Cleveland Clinic – Low Testosterone in Women
• Cleveland Clinic – Hyperandrogenism in Women

DISCLAIMER: IF YOU ARE CONCERNED WITH ANY OF YOUR RESULTS, PLEASE CONSULT WITH YOUR PHYSICIAN.

Free testosterone is the fraction of testosterone in the blood that is not bound to proteins such as SHBG and albumin. This bioactive form of testosterone plays a crucial role in many physiological processes, including sexual health, muscle mass, bone density, and mood regulation. Unlike total testosterone, free testosterone is the portion that is readily available to the body’s tissues to exert its effects.

Testosterone is primarily produced by the testes, under the regulation of the pituitary gland. Although only 1–2% of the testosterone in a man’s body is free, it is essential for driving bodily functions. Free testosterone levels naturally decline as men age, but maintaining balanced testosterone is crucial for overall health and vitality.

Why is free testosterone important?

Free testosterone is important because it represents the bioactive form of testosterone in the body. This fraction of testosterone is responsible for the development and maintenance of male sexual characteristics, muscle mass, bone density, and overall vitality. It regulates libido, energy levels, and mood.

Low testosterone levels in men can lead to fatigue, reduced muscle mass, low libido, and mood swings. However, the available free testosterone is what actually interacts with tissues to produce these effects, making it a critical measurement for assessing testosterone deficiency.

High or low levels of free testosterone can cause significant health issues:

• Low free testosterone can contribute to symptoms of fatigue, muscle loss, and low sexual desire, even if total testosterone is within the normal range.
• High free testosterone can cause issues such as acne, hair loss, and aggression, and is often seen in exogenous steroid users.

How can I better understand my free testosterone levels?

To better understand your free testosterone levels, it’s important to distinguish them from total testosterone. Total testosterone measures all the testosterone in your bloodstream, both bound and free, while free testosterone measures only the portion that is not bound to proteins and is available for tissue use.

Normal free testosterone levels for adult males can vary depending on age, time of day, and individual health. Free testosterone tends to be higher in younger men and decreases with age. Because testosterone follows a natural diurnal rhythm, it is highest in the early morning, which is why it is typically recommended to test testosterone levels in the morning.

How can I maintain optimal testosterone levels?

If you need to maintain or adjust your testosterone levels, consider the following strategies:

Dietary Changes:  A diet rich in lean proteins, healthy fats, antioxidant-rich foods, and hormone-supporting herbs like ginger and turmeric can support testosterone regulation. Including honey can help to increase lower testosterone levels. Research suggests that macronutrient, vitamin, and mineral intake can impact testosterone synthesis. Zinc-containing foods like oysters and pumpkin seeds can also regulate testosterone.

Lifestyle Changes: Avoiding chronic stressors, getting more and higher-quality sleep, and lowering abdominal fat percentage through a healthy regimen can help in improving testosterone levels. Additionally, engaging in regular physical activity, including strength training and aerobic exercise, can help support hormone balance, muscle strength, and overall well-being. Practicing stress-reducing techniques such as mindfulness, meditation, deep breathing exercises, and adequate sleep can also help support hormone balance and overall health.

Supplementation: Supplements like fenugreek seed extract, ashwagandha roots and leaves, and saw palmetto or boron can help to increase lower free testosterone levels. Adequate zinc intake has also been shown to regulate both elevated and decreased hormone levels, including testosterone.

Where can I learn more?

• Andrew Huberman has a masterclass on testosterone for males.
• Harvard Medical School – Testosterone: What It Is and How It Affects Your Health
• Cleveland Clinic – Testosterone

DISCLAIMER: IF YOU ARE CONCERNED WITH ANY OF YOUR RESULTS, PLEASE CONSULT WITH YOUR PHYSICIAN.

To get the most accurate insights from your SiPhox blood test—whether you’re using EasyDraw or finger prick—timing and preparation matter. Here’s how to prepare based on the panel you’re taking:

Best Time to Test

Test in the morning, ideally within 1–2 hours of waking up. This aligns with your body’s natural hormone rhythms (like cortisol and testosterone) and reduces variability.

Should You Fast?

Yes, fast for 8–12 hours before your test. Water is fine. Fasting improves accuracy for:

• Glucose & insulin (Core, Heart & Metabolic)
• Lipids like LDL and triglycerides
• Hormones like cortisol, DHEA-S, IGF-1, and even testosterone

Supplements & Meds

• Avoid supplements: Do not take any supplements for 24 hours before testing, especially biotin, B12, vitamin D, and adaptogens, which may skew results.
• Do not stop taking medications: Take your prescribed medications as instructed by your healthcare provider.

Exercise

• No intense exercise: Avoid intense workouts in the morning before your test.

Women-Specific Hormone Testing

We recommend following these guidelines to capture a more standardized baseline, but testing on other days can still be informative.

Click here to read more about Day 3 Hormone Testing

If you have menstrual cycles and are not on birth control:

Take the test on Day 3 of your period.

Count day 1 as the first day of full flow that starts before 5 pm.

Get your period at 3 pm on Monday? Test on Wednesday.

Get your period at 8 pm on Monday? Test on Thursday.

If you have menstrual cycles and are on birth control:

Users of continuous contraceptives like the minipill or hormonal IUD who still have regular periods should test on Day 3 of their periods. If you do not experience regular periods, it’s advised to wait three months after stopping contraceptives for hormone levels to normalize (please consult with your healthcare provider before stopping any medications).

If you have no menstrual cycles but are on birth control, any day is acceptable to test. 

If you do not undergo menstruation cycles due to menopause:

You can take the hormonal panel on any day.

Iron saturation is a blood test marker that measures the percentage of transferrin, the main protein that transports iron in the blood, that is currently carrying iron. It reflects how effectively your body is distributing available iron for essential functions

Why is Iron Saturation Important?

Iron saturation helps identify both iron deficiency and iron overload. It is critical for oxygen delivery through the formation of hemoglobin in red blood cells, energy production at the cellular level, and immune function.

Abnormal levels can indicate potential health issues:

• Low iron saturation (below 20%) may signal iron deficiency or anemia. Common symptoms include tiredness, lightheadedness, shortness of breath, and poor concentration.
• High iron saturation (above 50%) may indicate iron overload, which over time can contribute to conditions such as hemochromatosis, liver injury, joint pain, or heart dysfunction.

How can I better understand my iron saturation levels?

Iron saturation is calculated using serum iron and total iron-binding capacity (TIBC). This marker helps assess how efficiently iron is being distributed throughout the body. Here are the general ranges for iron saturation:

Lab Range:

• Out of range (low): <20%
• In range: 20%–50%
• Out of range (high): >50%

SiPhox Ranges:

• Out of range (low): <15%
• In range: 15%–55%
• Out of range (high): >55%

Iron saturation is typically interpreted alongside other iron-related markers such as serum iron, ferritin, and UIBC. While serum iron can fluctuate daily, iron saturation gives a more balanced view of iron availability and transport.

Understanding your iron saturation in context can help determine whether you are experiencing iron deficiency or iron overload, both of which may require lifestyle changes or medical treatment.

How can I maintain optimal iron saturation levels?

Maintaining balanced iron saturation involves managing both iron intake and absorption based on your current levels.

If your iron saturation is low:

• Eat iron-rich foods such as red meat, poultry, lentils, beans, tofu, and leafy greens.
• Pair iron with vitamin C (from citrus, peppers, or tomatoes) to improve absorption.
• Cook with cast iron cookware to naturally boost the iron content of your meals. This is especially effective when preparing acidic or liquid-based dishes.
• Avoid drinking tea, coffee, or calcium-rich beverages with meals, as they can block iron absorption.
• Consider iron supplements if recommended by your healthcare provider, especially if dietary changes are not sufficient.

If your iron saturation is high:

• Limit intake of red meat and iron-fortified foods to avoid excess iron.
• Avoid unnecessary iron supplements unless specifically prescribed.
• Reduce vitamin C supplementation, as it enhances iron absorption from food.
• Stay hydrated and maintain a balanced diet to support proper iron metabolism and transport.

Where Can I Learn More?

• NIH- Iron-Deficiency Anemia
• Mayo Clinic- Hemochromatosis
• Medscape – Iron Saturation

DISCLAIMER: IF YOU ARE CONCERNED ABOUT YOUR IRON LEVELS, PLEASE CONSULT YOUR PHYSICIAN.

A continuous glucose monitor (CGM) is a wearable sensor that tracks your glucose levels throughout the day and night, providing real-time data on how your body responds to food, activity, stress, and sleep. Unlike traditional fingerstick tests, CGMs measure glucose in interstitial fluid every few minutes, allowing for early detection of spikes, crashes, and trends that blood tests alone might miss. This data empowers users to make informed lifestyle changes to support stable blood sugar and long-term metabolic health.

Why is glucose important?

Glucose is the primary energy source for the body’s cells and is tightly regulated to maintain optimal function. Stable glucose levels are crucial for brain function, muscle activity, hormonal balance, and metabolic health. Chronically elevated or unstable glucose levels are associated with increased risk of diabetes, cardiovascular disease, and cognitive decline.

What is % of Glucose Readings Above the Range?

The % of Glucose Readings Above the Range reflects the proportion of time your blood glucose levels exceed the target range during continuous glucose monitoring. This metric is a key indicator of how often your body experiences hyperglycemia, or elevated blood sugar, over a given period.

How can I better understand my % of glucose readings above the range?

Even if your fasting glucose appears normal, a high percentage of readings above range may signal underlying metabolic stress or early-stage dysregulation. Here are the general ranges for fasting % of glucose readings above the range:

Lab Range:

• Out of range (low): <0 %
• In range: <0.5 %
• Out of range (high): >0.5 %

SiPhox Ranges:

• Optimal Range: <0.1 %
• Good Range: 0.1-0.5 %

Values above this range may indicate frequent episodes of hyperglycemia (high blood sugar), which can increase the risk of complications such as cardiovascular disease, kidney damage, and nerve dysfunction over time. Common symptoms of high glucose levels include increased thirst and urination, fatigue, blurred vision, slow healing of cuts and wounds, and frequent infections.

Values below this range suggest that elevated glucose excursions are infrequent or well-managed. This is generally favorable but should be considered in the context of other markers.

What is Average Glucose Level?

Average glucose level represents the mean of all glucose readings collected over a 2 week period. It gives a broader picture of daily glycemic exposure than individual measurements. This value is closely tied to hemoglobin A1c (HbA1c) and is a key indicator of long-term glucose control.

How can I better understand my average glucose levels?

Average glucose reflects the mean blood sugar level over a given period. Unlike a single fasting or post-meal reading, average glucose captures fluctuations throughout the day, including during meals, sleep, and periods of stress or physical activity. Here are the general ranges for average glucose level:

Lab Range:

• Out of range (low): <70 mg/dL
• In range: 70-110 mg/dL
• Out of range (high): >110 mg/dL

SiPhox Ranges:

• Optimal Range: 80-100 mg/dL
• Good Range: 70-80 mg/dL or 100-110 mg/dL

Values above this range may indicate chronic hyperglycemia and a higher risk of insulin resistance, prediabetes, or type 2 diabetes. Common symptoms of high average glucose include increased thirst and urination, fatigue, blurred vision, slow healing of cuts and wounds, and frequent infections.

Values below this range may suggest hypoglycemia or overtreatment with glucose-lowering medications. Symptoms of low average glucose include hunger, weakness, blurred vision, difficulty concentrating, dizziness, and in severe cases, confusion or loss of consciousness.

What is Estimated Fasting Glucose level?

Fasting glucose, also known as fasting blood sugar, is a critical marker of metabolic health and refers to the concentration of glucose in the blood after an overnight fast. SiPhox estimates your fasting glucose by taking an average of a sample of the lowest readings throughout a 24 hour period. It provides insight into the body’s ability to maintain and regulate blood sugar levels within a narrow range, even in the absence of food intake.

How can I better understand my fasting glucose levels?

Fasting glucose is typically measured after an overnight fast of at least 8 hours. Here are the general ranges for fasting glucose levels:

Lab Range:

• Out of range (low): <70 mg/dL
• In range: 70-125 mg/dL
• Out of range (high): >125 mg/dL

SiPhox Ranges:

• Optimal Range: 70-99 mg/dL
• Good Range: 99-125 mg/dL

Values above this range may indicate hyperglycemia (high blood sugar), while values below the range may suggest hypoglycemia (low blood sugar). Symptoms of high fasting glucose levels include increased thirst and frequent urination, fatigue, blurred vision, slow healing of cuts and wounds, and frequent infections. Symptoms of low fasting glucose include hunger, weakness, blurred vision, difficulty concentrating, confusion/disorientation, dizziness/lightheadedness, and nausea.

What is Glucose Variability?

Glucose variability describes how much your glucose levels fluctuate throughout the day. High glucose variability, especially frequent or large swings between highs and lows, has been linked to increased oxidative stress, inflammation, and blood vessel damage. These effects may raise the risk of complications such as heart disease, nerve damage, and eye disease, even when average glucose appears normal.. Studies show that reducing glucose variability can independently improve outcomes, especially in people with diabetes.

CGMs provide tools like standard deviation (SD) and coefficient of variation (CV) to help quantify variability:

• Standard deviation (SD) measures how far readings deviate from your average.
• Coefficient of variation (CV) expresses SD as a percentage of average glucose—values under 36% are generally considered acceptable.

Lower glucose variability is a sign of metabolic stability and better resilience to lifestyle factors like stress, sleep loss, or high-carb meals.

How can I better understand my glucose variability?

Glucose variability measures how much your blood sugar levels fluctuate throughout the day. Here are the general ranges for glucose variability:

Lab Range:

• Out of range (low): <0 %
• In range: <33 %
• Out of range (high): >33 %

SiPhox Ranges:

• Optimal Range: <25 %
• Good Range: 25-33 %

Values above this range indicate high glycemic variability, which has been linked to oxidative stress, inflammation, and increased risk of cardiovascular disease and diabetes complications. Symptoms may include energy crashes, brain fog, irritability, and cravings after meals due to rapid glucose swings.

Values below this range suggest more stable glucose levels, which is generally favorable. However, extremely low variability combined with low average glucose may indicate unrecognized hypoglycemia or overcorrection with medications.

How can I improve my glucose levels?

Use your CGM to identify patterns. Continuous glucose monitors offer powerful real-time insights. Tracking how meals, exercise, stress, and sleep affect your glucose allows you to fine-tune your habits and improve control.

Eat to minimize glucose spikes. A diet rich in fiber, lean protein, and healthy fats helps keep glucose stable. Avoid refined carbs and sugars, which tend to cause sharp elevations. Combining carbs with protein or fat can also slow glucose absorption.

Exercise regularly, especially after meals. Physical activity, especially walking or light movement after eating, enhances insulin sensitivity and reduces glucose spikes. Consistent exercise helps your muscles use glucose more efficiently, supporting long-term stability.

Improve sleep and manage stress. Poor sleep and high stress elevate cortisol, which can raise blood glucose levels. Prioritizing 7–9 hours of quality sleep and practicing stress-reducing techniques like meditation or deep breathing can improve glucose control.

Take your medications as prescribed. If you have diabetes, following your physician’s treatment plan is essential. This includes taking oral medications or insulin as directed, checking your glucose regularly, and attending follow-up visits. Medication adherence plays a critical role in preventing complications and keeping your glucose levels within a healthy range.

Where can I learn more?

• Cleveland Clinic – Diabetes Overview
• NIH – Continuous Glucose Monitoring
• PubMed – Glucose Variability and Health Risks
• diaTribe – Glucose Variability Guide

DISCLAIMER: IF YOU ARE CONCERNED WITH ANY OF YOUR RESULTS, PLEASE CONSULT WITH YOUR PHYSICIAN.

Why Day 3 of the Menstrual Cycle?

Day 3 of your cycle (with day 1 being the first day of your period) is considered an ideal time for hormone testing because it represents the body’s baseline hormonal state. At this early follicular phase, the reproductive hormones are at low, stable levels—unaffected by the mid-cycle ovulation surge or the hormonal changes of the luteal phase. Doctors often call day 3 the “baseline” since hormones like estrogen are at their most steady levels before they begin to rise later in the cycle. By checking levels at this time, providers can ensure an “apples to apples” comparison against standard reference ranges and get an accurate read on your body’s natural hormone balance before any dramatic cycle-driven fluctuations kick in [2].

Timing is critical because many hormone levels vary throughout the month. For example, follicle-stimulating hormone (FSH) and luteinizing hormone (LH) will spike around ovulation, and progesterone rises in the luteal (post-ovulation) phase. Testing in the middle or end of the cycle would give very different readings. By contrast, on about day 3, these levels are consistent and low, making it easier to detect abnormalities or imbalances. In fact, FSH levels can change from day to day in your cycle, so basic fertility evaluations specifically require an FSH blood test drawn on day 3 for a dependable measurement [3]. In short, day 3 provides a controlled checkpoint in the menstrual cycle when your hormones are at a baseline level. This baseline is invaluable for assessing reproductive health, because it allows doctors to spot warning signs (like unusually high or low levels) without the confounding effects of mid-cycle hormone surges.

It’s worth noting that if your cycle is a bit shorter or longer, some providers say testing on day 2 or day 4 is also acceptable – the goal is to capture that early follicular window.

What if I do not menstruate or am on birth control?

If you’re using hormonal birth control or in menopause, determining a true “day 3” can be challenging. Hormonal contraceptives often suppress your natural cycle, making it tough to pinpoint baseline hormone levels. Users of continuous contraceptives like the minipill or hormonal IUD who still have regular periods should test on Day 3 of their periods. To gain the most accurate picture, if you do not experience regular periods, it’s advised to wait three months after stopping contraceptives for hormone levels to normalize.

Perimenopausal and menopausal women may no longer ovulate monthly or have predictable periods, so hormone levels can be measured at any time.

Putting It All Together

Day 3 hormone testing provides a crucial baseline look at a woman’s reproductive hormones. By evaluating FSH, LH, estradiol, and prolactin at this early cycle stage, healthcare providers can gain insight into overall hormonal balance. Importantly, testing on day 3 standardizes the results — we know what “normal” looks like on day 3, which makes it easier to spot anything out of the ordinary. For instance, a normal FSH and estradiol with normal prolactin would suggest that the fundamental hormonal environment for fertility is sound. On the other hand, an abnormal result (such as a high FSH) might indicate a need to expedite or adjust fertility plans, or to investigate specific conditions further.

In conclusion, day 3 hormone testing is recommended because it offers a window into your reproductive system at rest, establishing a baseline against which potential problems can be measured. It’s a tried-and-true tool in gynecology and fertility medicine. By measuring FSH, LH, estradiol, and prolactin on cycle day 3, you can better understand your ovarian reserve and hormonal balance, ultimately helping to tailor recommendations or treatments to your needs. It’s all about catching your hormones at the right moment, so that you can get the clearest picture possible of your fertility health.

Where Can I Learn More?

1. One Fertility Clinic – Cycle Monitoring Day 3 Testing: Day 3 is known as the “baseline” since it captures hormone levels before they increase later in the cycle (Fertility Cycle Monitoring: Day 3 and Day 21 Tests).
2. Cleveland Clinic – FSH Blood Test Timing: FSH levels vary throughout the cycle, so testing is done on day 3 of the menstrual cycle to obtain a consistent baseline measurement (Follicle-Stimulating Hormone (FSH): What It Is & Function).
3. Center for Reproductive Medicine – Fertility Hormones Overview: High day-3 FSH is generally an indication of diminished ovarian reserve (fewer eggs), whereas normal-low FSH suggests a better ovarian response (What Hormones Are Tested for Female Fertility? | Blog) (What Hormones Are Tested for Female Fertility? | Blog).
4. IVF Orlando Blog – LH and Estradiol on Day 3: An elevated LH on day 3 may indicate polycystic ovary syndrome (PCOS), and an elevated estradiol level on day 3 can mask a high FSH (and may signal an ovarian cyst) (What Hormones Are Tested for Female Fertility? | Blog) (What Hormones Are Tested for Female Fertility? | Blog).
5. Endotext (NCBI/NIH) – Ovarian Reserve Testing: An abnormally high estradiol (>60–80 pg/mL) on day 3 can reflect diminished ovarian reserve and may artificially suppress FSH into a normal range (Ovarian Reserve Testing – Endotext – NCBI Bookshelf).
6. IVF Orlando Blog – Prolactin and Fertility: Elevated prolactin (hyperprolactinemia) can disrupt ovulation and cause irregular or absent menstrual cycles, making it harder to conceive (What Hormones Are Tested for Female Fertility? | Blog).
7. Reproductive Medicine Associates of NY – Day 3 Test Insights: Day 3 hormone tests (FSH, LH, estradiol) together assess ovarian reserve (quantity and quality of eggs), and are often combined with AMH testing for a fuller fertility evaluation (Know Your Numbers: Understanding AMH & Day 3 Test Results) (Know Your Numbers: Understanding AMH & Day 3 Test Results).

Laboratory Reference Ranges: How They’re Determined

Laboratory reference ranges are typically established through a standardized process:

• Testing a large sample of the local population
• Including people who aren’t necessarily in optimal health
• Using statistical analysis to include approximately 95% of results
• Creating a bell curve of results and setting ranges based on standard deviations
• Focusing primarily on identifying disease states rather than optimal health

This means these ranges are designed to identify clearly abnormal results rather than guide you toward optimal health. They reflect what’s common in the general population, not what’s ideal for your wellbeing.

Our SiPhox Grades: A Research-Based Approach

Our grading system is fundamentally different. We determine our ranges through:

• Comprehensive review of peer-reviewed clinical studies
• Analysis of research linking specific biomarker levels to health outcomes
• Evaluation of data from longevity and wellness research
• Integration of findings from multiple populations and health contexts
• Focus on identifying truly optimal ranges for health and performance

This evidence-based approach allows us to provide more refined and meaningful grades for those looking to improve their health beyond “average”:

Pay Attention (Red)

• Results requiring proactive attention and intervention
• Often still falls within standard laboratory “normal” ranges
• Our more stringent criteria serve as early warning signals
• Allows for preventive action before markers become out of range
• Based on clinical evidence of potential health impacts
• May indicate need for lifestyle changes or medical consultation
• Represents an opportunity for early intervention

Fair (Yellow)

• Results that fall short of evidence-based optimal ranges
• Based on studies showing room for health improvement
• May be “normal” by standard ranges but below optimal
• Indicates opportunity for targeted optimization

Good (Blue)

• Results aligned with positive health outcomes in research
• Better than population averages
• Supported by studies showing good health markers
• Represents solid foundation for wellness

Optimal (Green)

• Results matching levels seen in research on exceptional health
• Based on studies of longevity and peak performance
• Aligned with best documented health outcomes
• Represents evidence-based ideal targets

Why Our Approach Makes a Difference: A Practical Example

Let’s take Vitamin D as an example:

• Standard laboratory range: 25-100 ng/mL
• Our evidence-based optimization grades:
  • Pay Attention: < 30 ng/mL or > 100 mg/mL
  • Fair: 30-35 ng/mL
  • Good: 35-40 ng/mL
  • Optimal: 40-70 ng/mL

While a result of 32 ng/mL would be “within range” on a standard report, research shows better health outcomes at higher levels. Our grades reflect this scientific evidence rather than just population averages.

The Power of Evidence-Based Optimization

Our approach offers several advantages:

1. More nuanced understanding of your health markers
2. Grades based on actual health outcomes rather than population statistics
3. Targets derived from scientific research rather than averages
4. Focus on optimization rather than just avoiding disease

Remember: Standard ranges tell you if you’re similar to the general population. Our grades tell you how close you are to optimal health based on clinical evidence. This difference empowers you to make more informed decisions about your health journey.

Calcium is a vital mineral that plays a key role in bone strength, muscle function, nerve signaling, and blood clotting. Most of the body’s calcium is stored in bones and teeth, while a small but crucial amount circulates in the blood to support various physiological processes. Measuring blood calcium levels helps assess bone health, kidney function, and metabolic balance.

Why is Calcium Important?

Calcium levels in the blood must remain tightly regulated for the body to function properly. Low calcium (hypocalcemia) may indicate vitamin D deficiency, kidney disease, or issues with parathyroid function, leading to muscle cramps, tingling, and weakened bones. High calcium (hypercalcemia) can result from conditions like hyperparathyroidism, excessive vitamin D intake, or certain cancers, potentially causing fatigue, kidney stones, and abnormal heart rhythms. Regular calcium testing can help identify imbalances early and prevent complications.

How Can I Maintain Optimal Calcium Levels?

Maintaining balanced calcium levels requires proper nutrition, hormone regulation, and kidney health.

For Low Calcium:

• Increase calcium intake: Consume dairy products, leafy greens, almonds, and fortified foods.
• Boost vitamin D levels: Sun exposure or vitamin D supplements help with calcium absorption.
• Monitor parathyroid and kidney function: Dysfunction in these organs can affect calcium balance.

For High Calcium:

• Stay hydrated: Proper fluid intake helps prevent kidney stones and excessive calcium buildup.
• Limit calcium and vitamin D supplements: Excessive intake can contribute to hypercalcemia.
• Check for underlying conditions: If levels are persistently high, further testing for parathyroid or metabolic disorders may be needed.

Where Can I Learn More?

• Bone Health and Osteoporosis Foundation – Calcium and Vitamin D
• National Institutes of Health – Calcium Fact Sheet

DISCLAIMER: IF YOU ARE CONCERNED ABOUT YOUR CALCIUM LEVELS, PLEASE CONSULT YOUR PHYSICIAN.