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Doctor insights on: Elisa Test

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My ELISA HIV test came up negative after 1month exposure. How accurate is this test?

My ELISA HIV test came up negative after 1month exposure. How accurate is this test?

90%: There's a period of time after a person is infected during which they won't test positive. This is called the “hiv window period.” The window period can be from 9 days to 3-6 months, depending on the person's body and on the HIV-test that's used. ...Read more

Elisa (Definition)

Enzyme-linked immunosorbent assay (elisa) is a test that uses antibodies and color change ...Read more


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What is the ELISA test?

What is the ELISA test?

Antibody test: Enzyme-linked immunosorbent assay. Commonly used to test for hiv, but has many other uses. ...Read more

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What is an elisa? I had an ELISA test, but I don't understand what it is.

What is an elisa? I had an ELISA test, but I don't understand what it is.

Radiation-free test: Elisa is a test that detects a foreign substance (antigen) or an antibody in blood. Elisa uses an enzyme bound to a 2nd antibody . In the final step the enzyme converts indicator material to a different color. The amount of color detected corresponds to the amount of antigen or antibody present. Elisa gives the same answer as rast without using radioactive radioisotopes. ...Read more

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Difference between elfa and ELISA test. Are both of them accurate.Lets say 1 year after possible risky behaviour?

Both accurate: As described in prior answer comparing elisa and elfa testing for hiv, they are both very accurate. Both will be positive if HIV antibodies are present, usually takes 1-3 months after exposure. But by 3 months, it is '99.99%' accurate. ...Read more

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If there is a cross- reactivity during an elisa test is it possible to end up with a false negative as a result?

If there is a cross- reactivity during an elisa test is it possible to end up with a false negative as a result?

False positives: Cross-reactivity can cause false positives (meaning that the test is positive but the actual substance tested for isn't there). The happens when an antigen (virus, protein or bacterium) is so similar structurally that it reacts with the same antibody that the test is designed for. For example, the antibody test for latex allergy can sometimes cross react with a protein in bananas! Crazy, huh? ...Read more

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For what HBSAg spot ELISA test taken ?

Hepatitis B: Presence of HbSAg indicates active hepatitis B viral replication in the body and an active infection. It can and should be treated. ...Read more

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Hiv 7months ELISA test negative 100% accurate?

Hiv 7months ELISA test negative 100%  accurate?

No: If positive, it will be followed up with a confirmatory test. If negative, you are almost certainly okay but if you are very worried you might be able to pay for a pcr assay, which is the gold standard. ...Read more