Perimenopausal pregnancy rate
Fertility around the perimenopause is reduced.
Pregnancy rate in those not using contraception is:
- 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
Reference:
- FSRH (September 2019). Contraception for Women Aged Over 40 Years.
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