Evidence-Based Supplement & Herb Guides

Estriol Test in Pregnancy: Placenta Health, Fetal Screening, and Results

Learn what unconjugated estriol measures in pregnancy, how low and high results affect quad-screen risk, and which ultrasound, screening, or diagnostic follow-up may be offered.

An estriol test in pregnancy usually measures unconjugated estriol, or uE3, as one component of second-trimester prenatal screening. Estriol is an estrogen produced through...

Free Beta-hCG Test: First-Trimester Screening and Results

Understand free beta-hCG first-trimester screening, MoM values, high and low results, trisomy risk calculations, and follow-up testing options.

The free beta-hCG test measures one portion of human chorionic gonadotropin in maternal blood and is mainly used as part of first-trimester chromosome screening....

hCG Doubling Time Test: Early Pregnancy Levels, Trends, and Results

Learn how hCG doubling time is calculated, expected early pregnancy rises, slow or falling trends, ultrasound timing, and when ectopic symptoms need urgent care.

An hCG doubling time test is not a separate laboratory assay. It is an interpretation of two or more quantitative serum human chorionic gonadotropin...

Human Chorionic Gonadotropin (hCG) Blood Test: Positive, Negative, Levels, and Results

Learn how an hCG blood test reports positive, negative, and borderline results, how early pregnancy levels change, and when repeat testing or ultrasound is needed.

A human chorionic gonadotropin blood test detects hCG, a hormone made mainly by placental tissue after an embryo implants. Serum testing can identify very...

Human Placental Lactogen (hPL) Test: Placenta Function, Pregnancy Hormone, and Results

Learn what human placental lactogen does, why hPL testing is uncommon, what low or high results may mean, and how placental function is assessed in pregnancy.

Human placental lactogen, or hPL, is a protein hormone made by the placenta that helps shift maternal metabolism so the fetus has a steady...

Inhibin A Test in Pregnancy: Quad Screen, Down Syndrome Risk, and Results

Understand inhibin A in the quad screen, MoM values, high results, Down syndrome risk calculations, placental associations, and follow-up testing options.

Inhibin A is a placental and ovarian protein measured in maternal blood as one part of the second-trimester quad screen. The laboratory combines inhibin...

Miscarriage Hormone Test Panel: hCG, Progesterone, and Pregnancy Loss Results

Understand hCG and progesterone testing for suspected miscarriage, common result patterns, ultrasound follow-up, treatment limits, and urgent ectopic warning signs.

A miscarriage hormone panel usually means quantitative hCG testing, sometimes combined with progesterone, during an early pregnancy with bleeding, pain, uncertain development, or an...

Pregnancy Hormone Test Panel: hCG, Progesterone, Estradiol, Estriol, and Results

Understand hCG, progesterone, estradiol, and estriol pregnancy tests, what results can show, treatment effects, and when ultrasound or other testing is more useful.

A pregnancy hormone panel may include hCG, progesterone, estradiol, and estriol, but these tests answer different questions and are not routinely ordered together in...

Pregnancy-Associated Plasma Protein A (PAPP-A) Test: First-Trimester Screening and Results

Understand PAPP-A first-trimester screening, MoM values, low and high results, trisomy risk, placental associations, and appropriate follow-up.

Pregnancy-associated plasma protein A, or PAPP-A, is a protein produced largely by the placenta and measured in maternal blood during first-trimester screening. Laboratories combine...

Progesterone Test in Pregnancy: Low Levels, Miscarriage Risk, and Results

Understand progesterone testing in pregnancy, including low levels, miscarriage risk, result ranges, supplementation, and how hCG and ultrasound guide follow-up.

A progesterone blood test measures a hormone that helps prepare the uterine lining, support implantation, and maintain early pregnancy. The corpus luteum produces most...

Quad Screen Test: AFP, hCG, Estriol, Inhibin A, and Pregnancy Results

Learn how the quad screen uses AFP, hCG, estriol, and inhibin A, what positive pregnancy results mean, and which ultrasound or diagnostic follow-up may be offered.

The quad screen is a second-trimester maternal blood test that estimates the chance of certain fetal chromosome conditions and open neural tube defects. It...

Qualitative hCG Blood Test: Positive, Negative, Pregnancy, and Results

Understand qualitative hCG blood test results, including positive, negative, borderline, early pregnancy timing, false results, and when quantitative testing is needed.

A qualitative hCG blood test answers a focused question: is human chorionic gonadotropin detected above the assay’s decision threshold? The report is usually “positive”...

Quantitative hCG Blood Test: Pregnancy Levels, Doubling Time, and Results

Understand quantitative hCG blood test levels, expected rises, doubling time, falling results, ultrasound timing, and follow-up for early pregnancy and ectopic risk.

A quantitative hCG blood test measures the concentration of human chorionic gonadotropin in serum and reports a number, usually in milli-international units per milliliter....

Relaxin Blood Test: Pregnancy Hormone, Pelvic Changes, and Results

Learn what a relaxin blood test measures in pregnancy, why routine testing is uncommon, how pelvic changes are assessed, and what low or high research results may mean.

Relaxin is a peptide hormone produced mainly by the corpus luteum during human pregnancy, with additional local production reported in reproductive tissues. It participates...

Acromegaly Blood Test Panel: IGF-1, Growth Hormone, Oral Glucose Suppression, and Results

Understand acromegaly blood testing, including IGF-1, random growth hormone, oral glucose suppression, result patterns, confounders, and follow-up steps.

Acromegaly blood testing looks for persistent overactivity of the growth hormone system. The usual first test is insulin-like growth factor 1, or IGF-1, because...

ACTH Blood Test: High, Low, Pituitary Function, and Adrenal Results

Learn how an ACTH blood test is interpreted with cortisol, including high and low patterns, pituitary and adrenal causes, preparation, follow-up tests, and urgent symptoms.

An adrenocorticotropic hormone, or ACTH, blood test measures the pituitary signal that tells the adrenal glands to make cortisol. The result is most useful...