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A member asked:
What are the chances of a negative blood test in early pregnancy?
6 doctors weighed in across 2 answers
Very low: It depends on how "early" you are referring to, but generally, the blood test for pregnancy is very accurate with a very low false negative rate.
Answered 9/9/2012
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Can be false 17 days: A serum pregnancy test can be falsely negative up to 17 days after intercourse. Because urine pregnancy tests are less sensitive, it could take up to 3 weeks before turning positive after insemination.
Answered 6/5/2013
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