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To distinguish primary causes of gonadal failure from secondary causes, evaluate menstrual disturbances, and assist in infertility evaluations.
Serum collected in a gold-, red-, or red/gray-top tube.
|Age||Conventional Units and SI Units|
|Prepuberty||Less than 10 international units/mL|
|Male||1.4–15.5 international units/mL|
|Follicular phase||1.4–9.9 international units/mL|
|Ovulatory peak||6.2–17.2 international units/mL|
|Luteal phase||1.1–9.2 international units/mL|
|Postmenopause||19–100 international units/mL|