perimenopausal pregnancy rate
Last edited 02/2020 and last reviewed 02/2020
Fertility around the perimenopause is reduced.
Pregnancy rate in those not using contraception is (1):
- 10-20 per 100 women years at 45
- 5 per 100 women years at 50
Women should be informed that although a natural decline in fertility occurs with age and spontaneous pregnancy is rare after age 50, effective contraception is required until menopause to prevent an unintended pregnancy.
- fertility naturally decreases as age increases, with women experiencing a relatively steep decline from the mid-30s onwards mainly due to diminishing quality and quantity of oocytes
- the chance of pregnancy for a woman having unprotected sexual intercourse (UPSI) over the course of a year is around 10-20% for women aged 40-44 and closer to 12% for women 45-49. Spontaneous pregnancy is rare in women over 50
- women over 40 who are sexually active should use contraception if they do not wish to become pregnant
- FFPRHC Guidance (January 2005) Contraception for women aged over 40 years Journal of Family Planning and Reproductive Health Care 2005; 31(1): 51-64
- FSRH (September 2019). Contraception for Women Aged Over 40 Years.