Free Androgen Index (FAI): The Bioavailable Testosterone Your Total Count Hides
What FAI measures, why SHBG is the dominant driver, how to calculate your score, and why a 6–12 month retest interval is required.
Does Sprinting Increase Testosterone?
How sprint exercise affects testosterone levels acutely and over time, and which biomarkers to test to understand your hormonal response to training.
Is High Testosterone Good?
Testosterone is essential for health in both sexes, but elevated levels carry distinct risks by context. Here is what the evidence shows.
Free Testosterone: What Moves It and How to Read It
Free testosterone reflects androgen availability at the tissue level. Here is what the evidence shows about the factors that influence it.
Does Lifting Weights Increase Testosterone?
A science-based look at the relationship between resistance training and testosterone, with guidance on which biomarkers to track.
Reading Your LH Result Across the Cycle and Between the Sexes
Learn what LH reveals about reproductive signaling and hormone balance.
Does Your AMH Level Really Predict Your Fertility?
What AMH measures, why a low result doesn't determine fertility outcomes, and which companion markers complete the ovarian reserve picture
Prolactin: Not Just the Breastfeeding Hormone
What prolactin measures, why the dopamine brake matters, and how to read elevated or low results.
Leptin: The Fat-Cell Hormone That Signals Fullness
See how leptin levels reveal your body's communication between fat stores and hunger signals.
Estradiol and the Rhythm of the Menstrual Cycle
What estradiol measures, how cycle phase affects the result, and what low or high values mean alongside LH, FSH, and progesterone.
Cortisol: Your Body's Daily Rhythm in One Hormone
What cortisol actually measures, how to read AM vs. late-night results, and the diurnal-pattern confounder most labs don't explain.
SHBG and How Much of Your Testosterone Is Free
What SHBG measures, how it controls free hormone availability, and what high or low levels signal about metabolism and thyroid function.
CRP/DHEA-S Ratio: What Inflammation Versus Recovery Reserve Reveals
What the CRP/DHEA-S ratio measures, why inflammatory load can outpace recovery capacity, and how to interpret your score as a personal trend over time.
Estradiol Ultrasensitive: When Standard Assays Aren't Enough
Why ultrasensitive estradiol testing matters for hormonal balance, reproductive health, and longevity in both sexes, and how to interpret results.
17-hydroxyprogesterone: The Steroid That Backs Up Behind a Blocked Enzyme
What 17-OHP measures, how the 21-hydroxylase pathway shapes results, and which companion markers decode a high or low value.
Cortisol-to-DHEA-S Ratio: Your Stress Hormone Against Your Repair Hormone
What the cortisol-to-DHEA-S ratio measures, why cortisol and DHEA-S diverge with age, and how to interpret your score.
Total Testosterone: Why the Number Often Doesn't Match How You Feel
Track total T with SHBG to understand real hormonal availability.
Testosterone and Estradiol (T:E2): What the Balance Reveals About Aromatase
What the testosterone-to-estradiol ratio reveals about aromatase activity and hormone balance.
Progesterone: Did You Actually Ovulate?
What progesterone measures, why mid-luteal timing is critical, and how to read low, normal, and high results.
IGF-1: Your 24-Hour Read on Growth Hormone Activity
What IGF-1 measures, why reference ranges are age-specific, and which markers clarify the GH-axis picture.
Free Testosterone: The Unbound Fraction Your Cells Can Use
The unbound testosterone fraction that reaches tissues and drives androgen activity.
Bioavailable Testosterone vs Total: Reading the SHBG Gap
Go beyond total testosterone to what's actually active.
Adiponectin: The Fat-Cell Hormone That Falls as Fat Rises
What adiponectin measures, why lower levels track with visceral fat and insulin resistance, and which companion markers complete the picture.
FSH and the Brain-to-Gonad Signal It Carries
See how FSH helps map reproductive age and endocrine health.
DHEA-S: The Adrenal Androgen That Fades With Age
What DHEA-S measures, why levels decline with age, the cortisol/DHEA-S ratio, and how to read your result in context.
Reading Your Total Testosterone Result: The Full Circulating Pool
Total testosterone is a blood measurement of the overall amount of the sex hormone testosterone circulating in your body. Testosterone is a steroid hormone (an androgen) made primarily in the testes (Leydig cells) and, in all sexes, in smaller amounts by the ovaries and adrenal glands (adrenal cortex). Available at 2,000+ lab locations and at-home (select states). See FAQs below
What Free Testosterone Measures: The Unbound Hormone Cells Actually See
Free testosterone is the small portion of the hormone testosterone that circulates in blood without being attached to carrier proteins. Testosterone is produced mainly in the testes and, in smaller amounts, in the ovaries and adrenal glands. Most of it travels bound to sex hormone-binding globulin and albumin; only a small fraction is unbound. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring Bioavailable Testosterone: The Androgen Your Cells Can Reach
Bioavailable testosterone is the portion of testosterone in your bloodstream that can readily reach and activate cells. Testosterone is made primarily in the testes and ovaries, with a smaller amount from the adrenal glands. In blood, most testosterone is bound tightly to a carrier protein, sex hormone–binding globulin (SHBG), which keeps it largely unavailable. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Reading Your T:E2 Result: The Androgen-to-Estrogen Balance, Measured
Testosterone/Estradiol (T:E2) blood testing measures the levels of two key sex hormones and expresses their balance as a ratio. Testosterone is the leading “androgen” made mainly in the testes in males and the ovaries in females, with smaller amounts from the adrenal glands (androgen). Available at 2,000+ lab locations and at-home (select states). See FAQs below
Testosterone / CRP, Measured: Anabolic Drive Against Inflammatory Tone
Testosterone / CRP blood testing measures two distinct signals from the same blood sample. Testosterone is a sex hormone (androgen steroid) made mainly by the testes and, in smaller amounts, by the ovaries and adrenal glands; it is synthesized from cholesterol and circulates in the bloodstream. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring Testosterone / ApoB: Hormone Status Meets Particle Load
Testosterone / ApoB blood testing measures two distinct molecules with big biological roles: testosterone, a steroid hormone, and apolipoprotein B (ApoB), a structural protein on cholesterol-carrying particles. Testosterone is made mainly in the testes, with smaller amounts from the ovaries and adrenal glands. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring SHBG: What Your Result Says About Free Sex Hormone
Sex hormone binding globulin (SHBG) is a carrier protein made by the liver that binds and transports sex hormones in the blood. It has a strong attraction for testosterone and dihydrotestosterone, and a moderate one for estradiol (sex steroids; hepatocyte-derived high-affinity glycoprotein). Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring Prolactin: Reading the Pituitary Hormone Under Dopamine's Brake
Prolactin blood testing measures the level of prolactin, a protein hormone (polypeptide) made mainly in the front part of the pituitary gland (anterior pituitary) by lactotroph cells. Its release is normally held back by signals from the brain’s dopamine system (hypothalamic dopamine). Prolactin naturally rises in pregnancy, after childbirth, with nipple stimulation, and during sleep. Available at 2,000+ lab locations and at-home (select states). See FAQs below
What Your Progesterone Result Shows About Ovulation and Luteal Function
Progesterone is a natural hormone made mainly by the ovaries after ovulation, and by the placenta during pregnancy; smaller amounts come from the adrenal glands (and testes). It is a cholesterol‑derived steroid (a C21 progestogen) that circulates in the bloodstream bound to carrier proteins. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring LH: The Pituitary Signal Behind Ovulation and Testosterone
Luteinizing hormone (LH) is a chemical messenger made in the front part of the pituitary gland in the brain (anterior pituitary). Its release is prompted by signals from the hypothalamus (gonadotropin-releasing hormone, GnRH). LH is a glycoprotein produced by specialized pituitary cells (gonadotrophs). Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring Leptin: Reading the Body's Fuel Gauge From Fat Tissue
Leptin blood testing measures the amount of leptin in your bloodstream. Leptin is a hormone made mainly by body fat (white adipose tissue) and released by fat cells (adipocytes) in proportion to stored energy. It is one of the key signaling proteins produced by fat (adipokine) and is encoded by the LEP gene. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring IGF-1: The Liver's Stable Read on Growth Hormone Activity
Insulin-like growth factor 1 (IGF-1) is a protein hormone that circulates in the bloodstream and carries out growth signals. Most IGF-1 is made by the liver after stimulation from growth hormone released by the pituitary gland. Many tissues also make small amounts locally. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Reading Your FAI: Estimating the Testosterone Your Tissues Can Use
The free androgen index (FAI) is a calculated number derived from a blood test; it is not a hormone itself. It uses two measured players: total testosterone, the main androgen made primarily by the testes or ovaries and also by the adrenal glands, and sex hormone–binding globulin (SHBG), a transport protein produced by the liver. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring FSH: What Your Result Reveals About the Pituitary-to-Gonad Signal
Follicle stimulating hormone (FSH) is a signaling hormone in your bloodstream, made by the front part of the pituitary gland at the base of the brain (anterior pituitary gonadotropin). Specialized pituitary cells release FSH under cues from the brain (gonadotropin-releasing hormone, GnRH). Available at 2,000+ lab locations and at-home (select states). See FAQs below
Ultrasensitive Estradiol, Measured: Reading Estrogen at Very Low Levels
Estradiol is the body’s primary estrogen (17β‑estradiol, E2). It is made mainly in the ovaries, with smaller amounts produced in fat tissue and the adrenal glands via aromatase, and in the testes in men; during pregnancy, the placenta becomes a major source. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring Estradiol: What Your Result Shows About Your Potent Estrogen
Estradiol blood testing measures the principal estrogen in the body, estradiol. This steroid hormone is made mainly by the ovaries before menopause, in smaller amounts by the testes, and to a lesser degree by the adrenal glands and body fat through conversion of androgens (aromatization). During pregnancy, the placenta becomes a major source. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring DHEA-S: Reading Your Adrenal Androgen Output in One Result
DHEA-S is the sulfated, storage form of the hormone DHEA made mainly by the adrenal glands. In blood, it appears as a stable pool that the body can draw on. Most DHEA-S comes from the adrenal cortex (zona reticularis), with smaller contributions from the ovaries or testes and the brain. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Reading Your Cortisol-to-DHEA-S Ratio: Stress Against Recovery in One Result
Cortisol-to-DHEA-S ratio blood testing compares two adrenal hormones in your bloodstream. Cortisol is the body’s primary stress hormone, made in the adrenal cortex’s middle layer (zona fasciculata) in response to adrenocorticotropic hormone (ACTH). DHEA-S is the stable, circulating form of DHEA (dehydroepiandrosterone sulfate), produced mainly in the inner layer (zona reticularis). Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring Cortisol: What Your Result Reveals About the Stress Hormone's Daily Rhythm
Cortisol is the body’s primary stress-response hormone, made by the adrenal cortex and guided by the brain’s HPA axis. It mobilizes fuel, maintains blood pressure and vascular tone, tempers inflammation, and fol Available at 2,000+ lab locations and at-home (select states). See FAQs below
Reading Your CRP / DHEA-S Ratio: Inflammatory Burden Against Adrenal Reserve
The CRP/DHEA‑S ratio is a composite blood marker that compares two signals: C‑reactive protein (CRP) and dehydroepiandrosterone sulfate (DHEA‑S). CRP is an acute‑phase protein made by the liver when inflammatory messengers rise (interleukin‑6 and related cytokines). DHEA‑S is the sulfated, long‑circulating form of the adrenal androgen DHEA, produced in the adrenal cortex (zona reticularis) and acting as a hormone precursor pool that tissues can draw on. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring Adiponectin: The Fat-Cell Messenger That Tracks Insulin Sensitivity
Adiponectin blood testing measures the level of adiponectin circulating in your blood. Adiponectin is a hormone-like protein (adipokine) made primarily by fat tissue (adipose tissue) and secreted by individual fat cells (adipocytes) into the bloodstream. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Reading Your AMH Result: What the Follicle Pool Reveals About Ovarian Reserve
Anti-Müllerian hormone is a signaling protein made by the ovaries’ small, growing egg sacs (granulosa cells of preantral and small antral follicles). It’s called “anti-Müllerian” Available at 2,000+ lab locations and at-home (select states). See FAQs below
Measuring 17-hydroxyprogesterone: The Steroid Bridge From Cortisol to Androgens
17-hydroxyprogesterone is a steroid building block made mostly by the adrenal glands, with smaller amounts from the ovaries and testes. It sits midway in the body’s pathway for making cortisol, the main stress hormone. The molecule is created when progesterone is modified by a specific adrenal enzyme (17α-hydroxylase, CYP17A1). Available at 2,000+ lab locations and at-home (select states). See FAQs below
What Does SIADH Look Like in Sodium and Water-Balance Testing?
SIADH disturbs water and sodium balance. Blood tests clarify diagnosis by measuring serum sodium and albumin, key indicators of dilutional hyponatremia and volume status. At Superpower, we provide in-clinic and at‑home blood tests for sodium and albumin. Home testing is available in selected states. (See FAQs below for more info).
Male Infertility: Hormones That Map the Testicular Axis
Blood testing clarifies male fertility signals by mapping hormone dynamics. At Superpower, we measure testosterone, SHBG, free androgen index (FAI), LH, and FSH to assess testicular and pituitary function. We offer in-clinic and at-home blood testing; home collection for male infertility is available in selected states. (See FAQs below for more info).
Male Hypogonadism: Reading the Brain–Testis Axis in Blood
Blood testing clarifies low testosterone symptoms by measuring the hormone axis that drives male reproductive and metabolic health. At Superpower, we test testosterone, free and bioavailable T, LH, and FSH. We offer in-clinic and at-home collection; home testing is currently available in selected states. (See FAQs below for more info).
Hyperprolactinemia: How Prolactin Levels Ripple Through the Hormone Axis
Prolactin controls reproductive and pituitary signaling; persistent elevation (hyperprolactinemia) can disrupt cycles, fertility, libido, and galactorrhea. Blood testing confirms abnormal prolactin physiology early. At Superpower, we provide prolactin testing for hyperprolactinemia in clinic and at home. Home blood testing is available in selected states. (See FAQs below for more info).
GH Deficiency: How IGF-1 Reflects the Growth Hormone Signal
Blood testing can uncover growth hormone problems by tracking the body’s GH effect over time. IGF-1 (insulin-like growth factor 1) reflects average GH activity. At Superpower, we offer IGF-1 testing for GH deficiency in-clinic and at home; home testing is available in selected states. (See FAQs below for more info).
Female Infertility: Mapping the Hormonal Checkpoints of Conception
Blood testing clarifies ovulation timing, ovarian reserve, and endocrine balance—core drivers of fertility (FSH, LH, estradiol, progesterone, prolactin, TSH). At Superpower, we offer in-clinic and at-home testing for Female Infertility; home collection is currently available in selected states. (See FAQs below for more info).
Female Hypogonadism: Mapping the Pituitary-Ovarian Axis in Blood
Blood testing clarifies ovarian–pituitary signaling in female hypogonadism, revealing cycle integrity and ovulatory function. At Superpower, we test LH, FSH, estradiol, and progesterone. We offer in-clinic and at-home blood testing; home testing for female hypogonadism is currently available in selected states. (See FAQs below for more info).
Cushing’s Syndrome: Tracing the Cortisol Excess Pattern
Blood testing helps confirm Cushing’s syndrome by revealing excess adrenal hormone activity—elevated cortisol and androgen pathway signals (DHEAS). At Superpower, we offer cortisol and DHEAS testing for Cushing’s, with both in-clinic and at-home options. Home testing is currently available in selected states. (See FAQs below for more info).
BPH: How PSA and Free PSA Reflect Prostate Biology
Blood testing for BPH matters because PSA patterns reflect prostate growth and inflammation, guiding risk assessment and monitoring (prostate-specific antigen: total and free). At Superpower, we offer PSA total and free PSA testing with in-clinic and at-home blood testing. Home testing available in selected states. (See FAQs below for more info).
Addison’s Disease: Reading the Adrenal Hormone Shortfall
Blood testing helps confirm Addison’s disease early by revealing low cortisol and disrupted salt balance. At Superpower, we test cortisol, sodium, and potassium to assess adrenal function (hypocortisolism, hyponatremia, hyperkalemia). We offer in-clinic and at-home testing. Home testing is available in selected states. (See FAQs below for more info).
Acromegaly: What IGF-1 and GH Reveal About Growth Drive
Acromegaly stems from excess growth hormone, causing tissue overgrowth and metabolic strain. Blood testing—especially IGF‑1—confirms abnormal hormone activity and guides evaluation. At Superpower, we offer IGF‑1 testing for acromegaly in‑clinic and at home. Home blood testing is currently available in selected states. (See FAQs below for more info).
Hormone Panel Testing: Complete Guide
Your hormones orchestrate everything from energy to mood, but most people only test them when something feels wrong.
Progesterone Test Normal Range Guide
Your progesterone levels tell a story about ovulation, fertility, and hormonal balance that changes dramatically throughout your cycle.
Testosterone Test: Complete Guide to Testing
Your testosterone levels reveal far more than just reproductive health, they're a window into energy, muscle function, and metabolic wellness.
Normal Testosterone Levels: Reference Ranges & Optimal Values
Understanding your testosterone results goes far beyond checking if you fall within the "normal" range.
Cortisol Test: What It Reveals About Your Stress
Your cortisol levels reveal how well your body handles stress and regulates energy throughout the day.
Progesterone Test Kit: At-Home Testing Guide
Your progesterone levels tell a story about ovulation, fertility, and hormonal balance that changes throughout your cycle.
Full Hormone Panel Test: Complete Guide
A comprehensive hormone panel reveals the intricate network of chemical messengers that control everything from energy to mood to metabolism.
DHEA Sulfate High: Causes & Health Impact
High DHEA sulfate levels often point to overactive adrenal glands or underlying hormonal conditions that affect how your body produces androgens.
Estradiol Test: Understanding Your Levels
This hormone biomarker reveals the intricate dance between your reproductive system and overall metabolic health.
DHEA Sulfate Levels: Normal vs Optimal Ranges
Your body's master hormone precursor reveals more about aging, stress resilience, and vitality than most people realize.
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