Fertility Check: which blood markers matter?

Fertility assessment typically involves several blood markers. Anti-Müllerian hormone (AMH) is a key indicator of ovarian reserve. Follicle-stimulating hormone (FSH) and estradiol measured on day 2-4 of the menstrual cycle assess ovarian function. Luteinizing hormone (LH), progesterone, prolactin, and thyroid markers (TSH, free T4) are also important. Vitamin D and testosterone may be relevant. However, no single marker predicts fertility; they must be interpreted in clinical context. Consumer tests may offer these markers but often lack physician interpretation. Evidence is human-strong for AMH and FSH in predicting ovarian response, but less so for overall fertility outcomes. Caveat: results vary by age, cycle phase, and lab methods.