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Doctor insights on: False Negative Pregnancy Test Rate

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Can pregnancy blood test give false negative. 3 days late, urine test negative and blood test negative too?

Can pregnancy blood test give false negative. 3 days late, urine test negative and blood test negative too?

False negative PG: A false pregnancy test is possible however, in this case you also have a negative blood pregnancy test which is far more accurate. ...Read more

Dr. Andrew Seibert
4 doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more


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Preg test positive but blood test negative missed period?

Preg test positive but blood test negative missed period?

Timing: It is possible that the urine pregnancy test detected HCG that was in the urine even as a pregnancy was failing (impending miscarriage) but by the time a blood test was done, the miscarriage had already occurred and the levels of the HCG pregnancy hormone were cleared. Alternatively, it could have just been a false (+) urine pregnancy test. ...Read more

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False positive stress test reason?

False positive stress test reason?

Body habitus: Most common cause of false positive stress test is body habitus. This commonly affects women because the heart rhythm needs to be picked up through their breast tissue. ...Read more

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Positive HIV screener test at blood donation... Negative IFA and Negative NAT... False positive?

Positive HIV screener test at blood donation... Negative IFA and Negative NAT... False positive?

Yes: The initial screening test for HIV is very sensitive, but not very specific. The back up screening tests are much more specific for HIV. ...Read more

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I took 7 home pregnancy test all positive but doctor test say negative and blood test was negative why?

I took 7 home pregnancy test all positive but doctor test say negative and blood test was negative why?

Please clarify: Perhaps the reason can be known when you tell us honestly why you kept testing at home even though the test told you a positive answer. Something must have clued you into the fact something was not normal. You tell us. ...Read more

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Is a four week negative HIV antibody test / negative PCR test reliable?

Is a four week negative HIV antibody test / negative PCR test reliable?

HIV diagnosis: Antibody titers have been reported to be delayed as long as six months, but this is very unusual. A negative pcr for viral RNA is virtually determinative of the absence of infection. ...Read more

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Home pregnancy test was positive but blood hCG came back negative. Ob perform a blood test again. Hcg 750 progesterone 21. Why first hCG was negative?

Home pregnancy test was positive but blood hCG came back negative. Ob perform a blood test again. Hcg 750 progesterone 21. Why first hCG was negative?

Lab error: Presuming the first blood pregnancy test was close to the second, one of them had to be a lab error, probably the first one that was negative. If there is any question about the health of the pregnancy, your doctor can follow the bhcg level to see if it is rising appropriately and obtain an ultrasound when the level is high enough.For more info www.Askyourgynecologist.Org. ...Read more

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Are false positive herpes test likely?

Are false positive herpes test likely?

No: A positive antibody means you're infected with herpes. That doesn't mean you're developing outrbreaks, but it does mean that you at least have latent herpes somewhere in your body. A positive culture or pcr for herpes means you have an active lesion. ...Read more

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Negative pregnancy test results, but still no period.

Negative pregnancy test results, but still no period.

Hormonal imbalance: Menstrual irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. Consult this site for more information on this topic. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/Pages/causes.aspx ...Read more

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Home pregnacy test posirive.( first response.) dr. Urine pregnacy test negative. But no period. Last period nov 17, 2013?

Home pregnacy test posirive.( first response.) dr. Urine pregnacy test negative.  But no period.  Last period nov 17, 2013?

Defer to your Doctor: Health tap is not a place to pit our anonymous advice against the professional there in person taking care of you. What did your doctor tell you about these results? Did they offer you a blood test? And as an aside on december 16, 2013, with an lmp of 11/17/2013 it surely seems early to be testing. ...Read more

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4 pregnancy test positives (first response early test & ept) today. Also had qualitative blood test today but negative. Could i still be pregnant?

4 pregnancy test positives (first response early test & ept) today. Also had qualitative blood test today but negative. Could i still be pregnant?

What did your doctor: What did the physician caring for you tell you? It is hard here to be asked a question as if you are testing us to know if your physician told you the truth. Either you had a nonviable pregnancy or the tests are incorrect. Your physician who is testing and examining you will know that truth. ...Read more

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Positive quantiferon gold test but negative xray?

Positive quantiferon gold test but negative xray?

See below: It means that you have been exposed to tb. A chest x-ray that is positive would indicate either past or active infection. ...Read more

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Positive blood serum pregnancy test June 27. Urine tests still neg. should I be concerned?

Positive blood serum pregnancy test June 27.  Urine tests still neg.  should I be concerned?

June 27? today 6/22: I think you meant 6/17? Serum pregnancy test can detect pregnancy quite a bit earlier than the urine test can... if you tested positive on 6/17 with serum, the urine test should be coming soon.. any question/concern, consult doc. Good luck. ...Read more

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Can pregnacy test give you a false postive than 3 negatives?

Can pregnacy test give you a false postive than 3 negatives?

Sure: The pregnancy tests available over the counter are accurate over 98% of the time, but occasionally false results do occur. ...Read more

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Negative pregnancy test but light period?

Mentral periods: Periods vary from 3 to 5 days, light and heavy. This is normal and depends on your health and activity level. However, if you had sex and are worried, make sue you did your pregnancy test correctly as per the instructions and repeat it a week later to double check the accuracy. If no sex, then no way pregnant. If not pregnant, do nothing about the light period. ...Read more

Dr. Stephen Sudler
482 doctors shared insights

Pregnancy Test (Definition)

A pregnancy test measures a hormone called human chorionic gonadotropin (HCG). HCG is a hormone produced during pregnancy. It appears in the blood and urine of pregnant women as early as ...Read more