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In page Tubal ligation:

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Overall, all pregnancies, including ectopic pregnancies, are less common among patients who have had a female sterilization procedure than among patients who have not.[1][2] However, if patients do have a pregnancy after tubal ligation, a greater percentage of these will be ectopic; approximately one third of pregnancies that occur after a tubal ligation will be ectopic pregnancies.[1] The likelihood of ectopic pregnancy is higher among patients sterilized before age 30 and differs depending on the type of sterilization procedure used.[citation needed]