Cycle and ovulation
Perimenopause usually begins in the forties and brings shifting cycle length, hot flushes, sleep disturbance and mood change as hormone levels fluctuate. Fertility is much reduced but not zero, so contraception is still needed if pregnancy is not wanted, and AMH results in this phase should be interpreted with care.
Also known as: menopause transition
Sources
- Healthdirect Australia (healthdirect.gov.au)
Last reviewed: 10 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.