Tubal ligation is a surgical procedure that involves cutting, tying, or blocking the fallopian tubes to prevent pregnancy. It is a highly effective method of contraception, with a success rate of over 99%. However, there is a small chance that a woman may become pregnant after tubal ligation. The likelihood of pregnancy depends on several factors, including the type of tubal ligation performed and the length of time since the procedure.
One study found that the cumulative pregnancy rate after tubal ligation was 1.8% at 5 years and 3.7% at 10 years. This means that for every 100 women who have tubal ligation, 1-2 will become pregnant within the first 5 years, and 3-4 will become pregnant within the first 10 years.