The FSH‑LH‑prolactin‑TSH test is a blood panel measuring follicle‑stimulating hormone, luteinizing hormone, prolactin and thyroid‑stimulating hormone. It evaluates reproductive and pituitary function and screens thyroid status—used for menstrual irregularities, infertility, galactorrhea, or suspected pituitary/thyroid disorders. Timing matters (e.g., early follicular phase for FSH/LH; morning, fasting for prolactin). Abnormal results guide further testing.

FSH (follicle‑stimulating hormone) and LH (luteinizing hormone) tests assess reproductive function. In women, day‑3 FSH/LH levels gauge ovarian reserve and pituitary function; a mid‑cycle LH surge confirms impending ovulation. High FSH suggests diminished ovarian reserve; an elevated LH:FSH ratio can indicate PCOS. In men, these hormones evaluate sperm production and testicular function. Results guide fertility diagnosis and treatment planning.

A TSH test measures thyroid‑stimulating hormone to assess thyroid function, screen for hypothyroidism or hyperthyroidism, and monitor treatment. A prolactin test measures prolactin to evaluate unexplained breast milk production, menstrual irregularities, infertility, or symptoms suggesting a pituitary disorder (such as headaches or vision changes). Both tests detect hormonal imbalances and guide further endocrine evaluation.

Measure FSH and LH on cycle days 2–3 for baseline ovarian reserve and pituitary assessment; to confirm ovulation, test LH around the mid‑cycle surge (about day 12–14). Check prolactin when there are irregular periods, amenorrhea, or galactorrhea; draw prolactin in the morning (ideally fasting, at least 2 hours after waking), avoiding stress, nipple stimulation, or vigorous exercise beforehand.

A good result for conception is a day‑3 FSH roughly 3–10 mIU/mL (ideally under ~10), with lower values indicating better ovarian reserve. Day‑3 LH around 2–15 mIU/mL is typical; an appropriate mid‑cycle LH surge is required for ovulation. Very high FSH (>10–20) or an abnormal LH:FSH ratio (for example high LH in PCOS) can signal problems—discuss results with your clinician.

A prolactin test in females measures the blood level of prolactin, a pituitary hormone involved in milk production and reproductive function. It’s used to evaluate unexplained breast discharge (galactorrhea), menstrual irregularities, infertility, or suspected pituitary tumors. The test is a blood draw, often done in the morning and sometimes repeated. High prolactin can result from pregnancy, medications, hypothyroidism, or pituitary adenomas; low levels are uncommon.