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A 31-year-old female asked:

hi doctor, i drank an abortion pill, and started to bleed, i did another test afterwards and it still shows positive, please tell me why?

1 doctor answer2 doctors weighed in
Dr. Thomas Carzoli
Obstetrics and Gynecology 47 years experience
Half-life of HCG: After an abortion, the HCG levels start to fall. The half-life of HCG is 24-36 hours, so every 24-36 hours the level of HCG in your blood drops by 50%. Pregnancy tests vary in sensitivity to hcg, ranging from 10-100 miu/ml and the level of HCG also varies in pregnancy-e.g., 5 week pregnancy HCG could be 2500-6500. Thus, it may take a few weeks for the pregnancy test to become negative.

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Last updated Nov 15, 2020
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