Good question: In one's 20's, the chances of pregnancy with tubal ligation as form of birth control is about 1 in 200. In one's 30's, it's about 1 in 300. As you can imagine, these are estimates based on studying large numbers of women. If you're the one who gets pregnant, of course it doesn't seem like 1 in 200! Mirena (levonorgestrel) iud is also about 1 in 200. Essure is the most effective, due to x-ray confirms block.
Answered 6/30/2014
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