Progesterone is a hormone produced mainly by the ovaries after ovulation and by the placenta during pregnancy. It prepares the uterine lining for implantation and helps maintain early pregnancy.
Category: Hormones
Also known as: progesterone, p4, serum progesterone
Reference range: 0.2–1.4 ng/mL (Source: ABIM)
Standard unit: ng/mL
High values may indicate
High progesterone levels may indicate pregnancy, ovarian cysts, adrenal disorders, or congenital adrenal hyperplasia. Certain forms of ovarian cancer can also produce excess progesterone.
Low values may indicate
Low progesterone levels may indicate anovulation (failure to ovulate), luteal phase defect, ectopic pregnancy, threatened miscarriage, or ovarian dysfunction.