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Doctor insights on: Hpt False Positive

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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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Dr. Heidi Fowler
934 doctors shared insights

Home Pregnancy Test (Definition)

Any one of several kits available to the public. They rely on a colorimetric reaction that, in the presence of at least 25 miu hcg, will indicate positivity ...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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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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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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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

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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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Mantoux test positive?

Mantoux test positive?

Work up needed: At the very least it may suggest that you have been exposed to tuberculosis. You should visit with your doctor to have questions asked about whether or not you have TB symptoms to suggest infection such as do you have a cough? Unexplained night sweats? Unexplained weight loss, fevers or chills and fatigue? You also need to have a chest x ray performed - since organism is usually inhaled. ...Read more

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Faint positive HPTs after but less than 2 quantitative test, getting faint positive hpts but negative blood test?

Faint positive HPTs after but less than 2 quantitative test, getting faint positive hpts but negative blood test?

False positive urine: You seems to have false positive urine pregnancy test.Blood test is more sensitive and if it is negative then you can rest assure that you are not pregnant. ...Read more

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Period 6 days late, 3 negative test. False?

Period 6 days late, 3 negative test. False?

Pregnancy is not the: Only reason for a late or missed period. Options include low body weight, obesity, marked weight ^ or v, over-exercise, endurance athletics, breast-feeding, ^ stress, illness, eating disorders (bulimia or anorexia), anovulatory cycle (no egg released), travel, hormone irregularities, drug use, meds (i.e., birth control) or medical problems. #1 reason is pregnancy. ...Read more

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Positive ovulation test yesterday, negative today? What's wrong?

Positive ovulation test yesterday, negative today? What's wrong?

Nothing: It is common for an ovulation test to turn negative after a positive. The test is seeking to identify a peak in a hormone known as lh. Once it peaks it immediately begins to fall so the test would be negative. Once you get a positive you can generally stoop testing. ...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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What causes false positive HCV antibody test results?

What causes false positive HCV antibody test results?

Misinformed?: Who told you that your hep c test was false? If you have no viral load that means you cleared an infection. Are you sure you are getting the right advice? ...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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First response faint positives mean pregnant?

First response faint positives mean pregnant?

FIRST RESPONSE Early: Result pregnancy test is reported to detect HCG up to 6 days prior to your anticipated period. 2 lines = pregnant ; 1 line = not pregnant. The intensity of the color usually is not of significance if the test is read within the directed time period. If you read some forms of pregnancy test after too long a period - an evaporation line could develop. ...Read more

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Ana screen, ifa positive a (negative) means?

Ana screen, ifa positive a  (negative)   means?

Nothing by itself: One person in four tests positive. The vast majority of these people have no problems. The clinical picture is key, and how high the titer is may be helpful. ...Read more

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Negative pregnancy test but positive 5 hours later, why?

Congratulations: It is very likely that you are pregnant. I hope this is what you want. Best wishes to the three of you. ...Read more

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Can ANA test be false negative for lupus?

Can ANA test be false negative for lupus?

Lupus: Has specific criteria for diagnosis, ANA is just one of them and canot be relied on by itself for a diagnosis. ...Read more