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Dr. Andrew Rynne
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Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Accurate Is A Blood Pregnancy Test?

I had protected sex (not with my boyfriend) on October 3rd and then got my period on October 18th which is the day I was supposed to get it. After that, I have sex with My boyfriend and missed my period and am now pregnant. I took a hpt a few days before I was supposed to get my people and it was negative. Four days after I was supposed to get my period, it was positive. I had a blood test done to see how far along I am and they said at the time I was a little over 4 weeks. How accurate are those tests? Could I have gotten pregnant from the 3rd and still had my period and negative test?
Wed, 27 Jan 2016
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OBGYN,  's  Response
Hallow Dear,

Since your HPT and blood test both have reported your pregnancy, there is no dilemma about its diagnosis.

Blood test to detect pregnancy is estimating Beta hCG in the blood. This is highly specific and sensitive test. Its results are highly reliable.

The duration of pregnancy you have been informed by these tests is not the duration from the missed period; it is from the day of conception. There is a gap of about 2 weeks in these two. So you need not doubt your menstrual history nor should you doubt the accuracy of Beta hCG test.

I hope this helps you.

Dr. Nishikant Shrotri
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How Accurate Is A Blood Pregnancy Test?

Hallow Dear, Since your HPT and blood test both have reported your pregnancy, there is no dilemma about its diagnosis. Blood test to detect pregnancy is estimating Beta hCG in the blood. This is highly specific and sensitive test. Its results are highly reliable. The duration of pregnancy you have been informed by these tests is not the duration from the missed period; it is from the day of conception. There is a gap of about 2 weeks in these two. So you need not doubt your menstrual history nor should you doubt the accuracy of Beta hCG test. I hope this helps you. Dr. Nishikant Shrotri