In 2-5% of individuals who have recently received an influenza vaccination, there may be a temporary false positive EIA.

It is possible to get a false positive test result. This happens when a doctor or laboratory has not performed a confirmatory antibody test before giving people their results. When a person has an antibody test, the lab usually runs two different kinds of tests. One is called an EIA test which is highly sensitive. It can sometimes overreact, so a positive result with the EIA is usually followed up with a RIBA test which is a sophisticated, highly-specific, antibody test.

False negative results are more common than false positives - and are primarily due to inaccuracies in timing of the test or carelessness in the test procedure itself. Please follow test instructions with circumspection and precision. A false negative result can also stem from using a diluted urine sample and/or from taking a test too early in pregnancy. First morning urine contains the most concentrated presence of hCG - which makes it the ideal sample for pregnancy testing.

Yes, a false positive test means the test looks as if it is positive, but it is really negative. This happens more often in people who have a low risk for the disease. It is important to confirm the test result a second time.

One limitation of T-scan is that is can sometimes yield false-positive results. That is, the T-scan will indicate cancer when cancer is not present. Researchers believe that the rate of false-positive results with T-scan imaging seems to be correlated to hormone status. In young, pre-menopausal women, the rate of false positives is correlated with estrogen levels over the menstrual cycle.

Yes, you might. The common culprit is Pseudoephedrine which is found in many OTC products and in cold and sinus medications. So you will need a laboratory confirmation as well as an MRO review by your physician to determine the source. No - because our rapid drug tests react to drugs and drug metabolites, not to these substances which have a different chemical structure.

Nonreactive indicates that the serum tested does not have detectable antibodies to HIV-1. There are several reasons for this: Person is in the window period immediately after infection when antibodies are not yet being produced. Person is in the final disease stages when the immune system is no longer capable of producing detectable antibody.

It is important to bear in mind that common diseases, such as atrial fibrillation and stroke, occur as a result of the interplay of both environmental (including lifestyle and other health and medical conditions) and inherited risk factors. As a result, having a specific genetic risk factor for a common disease does not mean that one will necessarily develop the disease; and not having a certain risk variant does not eliminate the possibility of developing the disease.

individual with two copies of the risk variants will receive a positive result for deCODE MI™, and those with only one or no copy of the risk variants will receive a negative result for the test. Back to top of page

A "false-reactive" (or "false-positive") test result means that the initial screening test was "reactive" but a more precise follow-up test was negative.

Yes. A false positive test means the test looks as if it is positive, but it is really negative. This happens more often in persons who have a low risk for the disease for which they are being tested. For example, false positive anti-HCV tests happen more often in persons such as blood donors who are at low risk for hepatitis C.

To test for the most common drugs of choice (marijuana/THC; Cocaine; Ecstasy or Morphine) all on one card:

No. Home pregnancy tests only check hCG levels, not progesterone. They are completely different hormones.

No. Clomid will not cause a false positive result on a hpt. The only infertility therapy that will cause a false positive is hCG. HCG is the hormone that all HPTs measure. If you are taking only clomid to assist you in Oing, and you get a positive result on a HPT, congratulations! you are pregnant.