Evidence-Based Supplement & Herb Guides

Estrone (E1) Test: Menopause, Estrogen Levels, High and Low Results

Understand estrone testing in menopause and other settings, why E1 may be high or low, how it differs from estradiol, and what follow-up is useful.

An estrone (E1) test measures an estrogen produced in the ovaries, adrenal-related pathways, and especially through conversion of androgens in fat and other tissues....

Fertility Hormone Test Panel: FSH, LH, Estradiol, AMH, Progesterone, Prolactin, and Results

Understand fertility hormone panels, the timing and meaning of FSH, LH, estradiol, AMH, progesterone, and prolactin, and the limits of normal results.

A fertility hormone test panel combines measurements that answer different questions about ovarian reserve, ovulation, pituitary signaling, and menstrual function. FSH and estradiol are...

Follicle-Stimulating Hormone (FSH) Test: High, Low, Normal Range, Fertility, Menopause, and Results

Understand FSH testing, normal cycle and menopause patterns, causes of high or low results, fertility limits, and how related hormones guide next steps.

A follicle-stimulating hormone (FSH) test measures a pituitary signal that supports ovarian follicle development and sperm production. In women, FSH changes across the menstrual...

Free Testosterone Test: High, Low, Normal Range, SHBG, and Hormone Balance

Understand free testosterone testing, how SHBG changes results, reliable measurement methods, causes of high or low levels, and safe follow-up steps.

A free testosterone test measures or estimates the small fraction of testosterone not bound to proteins. It is most useful when total testosterone and...

Gonadotropin-Releasing Hormone (GnRH) Stimulation Test: Puberty, Pituitary, and Results

Understand the GnRH stimulation test for early or delayed puberty, how LH and FSH responses are interpreted, protocol limits, and the next steps after results.

A gonadotropin-releasing hormone (GnRH) stimulation test evaluates how the pituitary releases luteinizing hormone (LH) and follicle-stimulating hormone (FSH) after a GnRH-type medicine. It is...

Infertility Blood Test Panel for Men: Testosterone, FSH, LH, Prolactin, Inhibin B, and Results

Learn how testosterone, FSH, LH, prolactin, and inhibin B are used in a male infertility blood test panel, including result patterns, ranges, preparation, and follow-up.

A male infertility blood test panel measures hormones that control testosterone production and sperm development. It commonly includes total testosterone, follicle-stimulating hormone (FSH), luteinizing...

Infertility Blood Test Panel for Women: FSH, LH, AMH, Estradiol, Prolactin, and Results

Understand how FSH, LH, AMH, estradiol, and prolactin are used in a female infertility blood test panel, including timing, result patterns, ranges, and next steps.

A female infertility blood test panel measures hormones involved in follicle development, ovulation, ovarian reserve, and pituitary signaling. It commonly includes follicle-stimulating hormone (FSH),...

Inhibin A Test: Pregnancy Screening, Ovarian Function, and Results

Learn how an inhibin A test is used in the pregnancy quad screen and selected ovarian evaluations, including MoM results, high and low values, follow-up, and limits.

An inhibin A test measures a protein hormone made by ovarian granulosa cells and, during pregnancy, mainly by the placenta. Its most familiar use...

Inhibin B Test: Ovarian Reserve, Sertoli Cell Function, Male Fertility, and Results

Learn how an inhibin B test reflects Sertoli-cell and ovarian follicle activity, including high and low results, male fertility, ovarian reserve, ranges, and follow-up.

An inhibin B test measures a reproductive hormone produced mainly by ovarian granulosa cells in women and Sertoli cells in the testes in men....

Luteinizing Hormone (LH) Test: High, Low, Normal Range, Ovulation, and Results

Learn how an LH test is used for ovulation, fertility, testosterone production, menopause, and puberty, including normal ranges, high and low results, and follow-up.

A luteinizing hormone test measures LH in blood or urine. LH is released by the pituitary gland and helps control ovulation, menstrual-cycle hormone production,...

Menopause Hormone Test Panel: FSH, Estradiol, LH, AMH, Symptoms, and Results

Learn when FSH, estradiol, LH, and AMH testing helps assess menopause and perimenopause, including result patterns, symptoms, limitations, and follow-up.

A menopause hormone test panel may include follicle-stimulating hormone (FSH), estradiol, luteinizing hormone (LH), and anti-Müllerian hormone (AMH). These markers reflect ovarian activity and...

Ovarian Reserve Test Panel: AMH, FSH, Estradiol, Inhibin B, and Results

Learn how AMH, FSH, estradiol, and inhibin B ovarian reserve tests are timed and interpreted, including low, high, and discordant results.

An ovarian reserve test panel estimates how the ovaries may respond to fertility treatment by measuring anti-Müllerian hormone (AMH), follicle-stimulating hormone (FSH), estradiol, and...

Ovulation Blood Test Panel: LH Surge, Progesterone, Estradiol, and Results

Understand how LH, progesterone, and estradiol blood tests track ovulation, when each test should be timed, and what high, low, or mismatched results mean.

An ovulation blood test panel uses luteinizing hormone (LH), progesterone, and estradiol to determine whether an egg is developing, whether an LH surge is...

PCOS Hormone Test Panel: Testosterone, DHEA-S, LH/FSH Ratio, Insulin, and Results

Learn how testosterone, DHEA-S, the LH/FSH ratio, insulin, and glucose tests are used in PCOS, what abnormal patterns mean, and which mimics must be excluded.

A PCOS hormone test panel may include total and free testosterone, sex hormone-binding globulin (SHBG), dehydroepiandrosterone sulfate (DHEA-S), LH, FSH, glucose testing, and sometimes...

Precocious Puberty Hormone Test Panel: LH, FSH, Estradiol, Testosterone, and Results

Learn how LH, FSH, estradiol, and testosterone are used to distinguish central from peripheral precocious puberty and what testing, imaging, and follow-up may involve.

A precocious puberty hormone test panel measures luteinizing hormone (LH), follicle-stimulating hormone (FSH), estradiol, or testosterone to determine whether a child’s reproductive hormone system...

Progesterone Blood Test: High, Low, Normal Range, Ovulation, and Results

Understand progesterone blood test timing, normal ranges, ovulation thresholds, and possible causes of high or low results in menstrual cycles, fertility care, and pregnancy.

A progesterone blood test measures a hormone that rises after ovulation and supports the uterine lining in early pregnancy. The result is most useful...

Prolactin Blood Test: High, Low, Normal Range, Fertility, Pituitary, and Results

Learn what high or low prolactin blood test results mean, how prolactin affects fertility and pituitary function, and when repeat testing, MRI, or treatment is needed.

A prolactin blood test measures a pituitary hormone best known for stimulating breast milk production. Outside pregnancy and breastfeeding, persistently high prolactin can suppress...

Reproductive Hormone Panel: Estrogen, Progesterone, Testosterone, FSH, LH, Prolactin, and Results

Learn how estrogen, progesterone, testosterone, FSH, LH, and prolactin results are interpreted together for fertility, periods, gonadal function, and pituitary health.

A reproductive hormone panel measures estrogen—usually estradiol—progesterone, testosterone, follicle-stimulating hormone (FSH), luteinizing hormone (LH), and prolactin. The panel can help evaluate irregular periods, infertility,...

Sex Hormone-Binding Globulin (SHBG) Test: High, Low, Normal Range, and Results

Learn what high or low SHBG blood test results mean, how SHBG changes free testosterone, common causes, normal-range limits, and appropriate follow-up testing.

A sex hormone-binding globulin (SHBG) test measures a liver-made protein that binds testosterone, dihydrotestosterone, and estradiol in the bloodstream. SHBG helps determine how much...

Testosterone Blood Test: High, Low, Normal Range, Fertility, and Results

Learn how total and free testosterone blood tests are timed and interpreted, including high and low causes, normal-range limits, fertility effects, and appropriate follow-up.

A testosterone blood test measures total testosterone and, when needed, free or bioavailable testosterone. Testosterone is produced mainly by the testes in men and...