Follicle stimulating hormone (FSH) - plasma
Last updated: Thursday, 15, April, 2004
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5 mL blood in lithium heparin tube.
| Reference Interval|
Method dependent, and related to menstrual cycle in females.
Female: 1.0-8.0 U/L
Adult male: 1.0-5.0 U/L (age related).
|Application||Investigation of gonadal hypofunction, suspected pituitary tumour.|
Levels are increased when pituitary secretion occurs in the absence of feedback inhibition by gonadal androgens or oestrogens (primary gonadal hypofunction, post-menopausal state, castration).
Increased levels may also be seen with pituitary gonadotroph tumours, although some tumours secrete only the α subunit.
Levels are decreased if ovarian or testicular failure is due to pituitary or hypothalamic disease.
Thorner MO et al and Carr