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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Why Is HBCAB Is Negative With Positive Pregnancy Test?

Hi I have a unusual case..I was pregnant in 07 had my sone in july...got sick wne back into hosp in august had every test known to man...ok I get out everything is ok..I get pregnant again..go for prenatal testing ..what hbsag comes back positive..I say no way I just had a baby and that coudnt b right..so they test agagin...positive...on neither test did they do the confirmation...well we test again come up negative hbsag..reflex negative also..then fastfoward to next year I have another baby surface anitgen negative anf the year after another test says surface antigen negative...don t know what to make of all this ....oh igm hbeag,hbeab. And hbcab were all negative in the first test
Tue, 15 Sep 2015
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OBGYN,  's  Response
Hello, and I hope I can help you today.

HbSAG is a test for Hepatitis B exposure. It has nothing to do with pregnancy. It is a test done on every routine pregnancy screen, because in women with hepatitis, special medicine needs to be given to the baby at birth to prevent disease.

It sounds like you had one false-positive test during your second pregnancy (as the confirmatory test and all the others were negative) so you do not seem to have Hepatitis B. HbC is Hepatitis core antigen, which will only be positive normally if the HbSAG is positive, so it makes sense that this test was also negative.

So in summary, HbSAG and HBC tests are not affected by pregnancy- they just do the test while you are pregnant because the disease can affect a newborn baby. I suggest you get the vaccine against Hepatitis B if possible after the pregnancy so you will be immune as this is standard of care in most Western countries for all children and adults.

I hope this answered your question and best wishes,

Dr. Brown
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Why Is HBCAB Is Negative With Positive Pregnancy Test?

Hello, and I hope I can help you today. HbSAG is a test for Hepatitis B exposure. It has nothing to do with pregnancy. It is a test done on every routine pregnancy screen, because in women with hepatitis, special medicine needs to be given to the baby at birth to prevent disease. It sounds like you had one false-positive test during your second pregnancy (as the confirmatory test and all the others were negative) so you do not seem to have Hepatitis B. HbC is Hepatitis core antigen, which will only be positive normally if the HbSAG is positive, so it makes sense that this test was also negative. So in summary, HbSAG and HBC tests are not affected by pregnancy- they just do the test while you are pregnant because the disease can affect a newborn baby. I suggest you get the vaccine against Hepatitis B if possible after the pregnancy so you will be immune as this is standard of care in most Western countries for all children and adults. I hope this answered your question and best wishes, Dr. Brown