Failure rate ( female sterilisation )
Female sterilisation is 99% effective for pregnancy prevention (1)
There is a small risk of failure of sterilisation of less than 1 pregnancy in 100 women in the first year, and about 2 pregnancies in 100 women over 10 years. (2)
Sterilisation is best avoided immediately after delivery as operation is more difficult because the uterus is large and highly vascular, and the tubes are high in the abdomen. The failure rate is increased if the procedure is undertaken immediately post-partum (about 14 per 1000 cases).
References
- Hatcher R. Contraceptive technology. 21st ed. New York: Ardent Media; 2018.
- World Health Organization. Family planning - a global handbook for providers. 3rd edition. 2018 [internet publication].
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