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PCOS: polycystic ovarian syndrome, OHSS: ovarian hyperstimulation syndrome.
| Investigations | PCOS | FSH-secreting adenoma with OHSS |
| Follicle-stimulating hormone (FSH) | Low | High |
| Luteinizing hormone (LH) | Elevated | Normal or low |
| Pelvic ultrasound | Mildly enlarged polycystic ovaries (cysts rarely >10 mm), | Grossly enlarged ovaries, with cysts measuring at least 15 mm) |
| Clinical hyperandrogenism | Usually, present | Unlikely |
