PSA Blood Test: What It Measures, Preparation, and Results
A PSA blood test measures prostate-specific antigen to help screen for or monitor prostate concerns. Learn how to prepare, what results mean, and what follow-up may involve.
Lab Test Guides
AMH Blood Test: What It Measures, Preparation, and Results
An AMH blood test estimates ovarian reserve and helps fertility clinicians plan treatment, but it cannot diagnose infertility by itself or predict natural pregnancy from one result. Learn how the test works, how to prepare, what low or high AMH may mean, and what to ask next.
Progesterone Blood Test: What It Measures, Preparation, and Results
A progesterone blood test measures progesterone in serum and is often used to help confirm ovulation, evaluate irregular cycles, or monitor selected pregnancy and fertility situations. Timing matters: day 21 only applies to a 28-day cycle.
Cortisol Blood Test: What It Measures, Preparation, and Results
A cortisol blood test measures a key adrenal hormone that follows a strong daily rhythm. Learn why timing matters, how to prepare, what high or low results can mean, and what follow-up tests may be needed.
Prolactin Blood Test: What It Measures, Preparation, and Results
A prolactin blood test measures a pituitary hormone involved in milk production and reproductive hormone signaling. Learn why it is ordered, how to prepare, what high or low results may mean, and what follow-up testing may be needed.
SHBG Blood Test: What It Measures, Preparation, and Results
An SHBG blood test measures sex hormone-binding globulin, a liver-made protein that affects how much testosterone and estrogen are available to body tissues. Learn when it is ordered, how to prepare, what high or low results can mean, and what to ask next.
DHEA-S Blood Test: What It Measures, Preparation, and Results
A DHEA-S blood test measures dehydroepiandrosterone sulfate, an adrenal androgen used to evaluate adrenal function and androgen-related symptoms. Learn what it checks, how to prepare, and how to read results.
Estradiol Blood Test: What It Measures, Preparation, and Results
An estradiol blood test measures the main form of estrogen in the blood. Learn why it is ordered, how to prepare, what can affect results, and how to compare testing options responsibly.
Testosterone Free Blood Test: What It Measures, Preparation, and Results
A free testosterone blood test measures the unbound fraction of testosterone available to tissues. Learn when it is useful, how to prepare, how results are interpreted, and how cash-pay ordering options compare.
Testosterone Total Blood Test: What It Measures, Preparation, and Results
A total testosterone blood test measures bound and free testosterone together. Learn when it is used, how to prepare, what results can mean, and how self-pay ordering options compare.