A member asked:

Can a pregnancy blood test be done too early ?

3 doctors weighed in across 2 answers
Dr. Gerard Honore answered

Specializes in Fertility Medicine

Yes: 'too early' means before it can be reliable - i.e., less than 10-11 days after ovulation. This can be thought of as a false-negative.

Answered 9/16/2019

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Yes: Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.

Answered 9/20/2019

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