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In page Ovarian reserve:

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Although FSH and more recently Inhibin B have been shown to have some correlation with ovarian reserve, it is now well established that Anti-Mullerian Hormone or AMH is more useful biochemical test. High levels however can be present in women with Polycystic Ovarian Syndrome which compromises female fertility and therefore a combination of AMH and a transvaginal ultrasound to count the number of antral follicles is probably the best way to assess ovarian reserve and future fertility. This combination is sometimes referred to as the Biological Body Clock Test.