Hormone | PCOS | POI | Hypothalamic amenorrhoea |
Follicle-stimulating hormone (FSH) | Normal | High | Low or normal |
Luteinising hormone (LH) | Normal/high normal | High | Low |
Estradiol | Normal | Low | Low |
Testosterone | Normal or high | Normal or low | Low or normal |
Sex hormone-binding globulin (SHBG) | Normal or low | Normal | Normal |
Free androgen index | Normal or high | Normal or low | Low or normal |
PCOS, polycystic ovary syndrome; POI, premature ovarian insufficiency.