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If you have been tested for HIV infection, you may be told that the result is ‘reactive’. While this is sometimes described as a ‘positive’ result, it could be a false positive. The result indicates that the test has reacted to something in your blood and this should be investigated further.

It does not necessarily mean that you are HIV positive. Because false positives can happen, doctors never use a single test to give an HIV-positive diagnosis. If the result is reactive, the result is only preliminary and must be verified with a series of confirmatory tests.

These follow-up tests are best done by a healthcare professional who has access to the most accurate HIV testing technologies.

Glossary

false positive

When a person does not have a medical condition but is diagnosed as having it.

HIV

Human immunodeficiency virus, the virus which causes AIDS. There are two variants: HIV-1, and HIV-2. HIV-1 is by far the most common worldwide. See ‘subtype’ for more information.

home testing

The term may be used to describe either self-testing or self-sampling. 

on

Abbreviation of a Latin term meaning every night.

self-testing

In HIV testing, when the person testing collects their own sample and performs the whole test themselves, including reading and interpreting the result. 

Roger Pebody

Roger Pebody

Commissioning Editor

Roger joined aidsmap in 2008 and was Managing Editor from 2018 to 2024. As a freelancer, he now edits aidsmap’s news and conference coverage, as well as working on updates to About HIV pages. He is also a contributing science editor for TheBodyPro, a freelance journalist for The Lancet HIV, and a medical writer helping researchers prepare articles for peer-reviewed journals. He began working on HIV at Gay Men Fighting AIDS in the mid-1990s.

Basic information

Testing

Testing basics leaflet.

Better off knowing

Better off knowing

Very recent infection

Very recent infection

HIV testing

A close-up of a glass receptacle which contains a testing vial. This vial is labelled as being ready to receive blood for an HIV test. The image has a pink and purple filter over it. The image has a pink and purple filter over it.

False positive results on HIV tests

An empty vial marked with the word "HIV" resting in a test tube. The image has a pink and purple filter on it.

False negative results on HIV tests

A person wearing a surgical glove holds the hand of somebody else. This person is having their finger pricked with a fine needle. The needle has drawn a small amount of blood which is visible. The image has a pink and purple filter over it.

What is the window period for HIV testing?

A person wearing a surgical glove holds the hand of somebody else. This person is having their finger pricked with a fine needle. The needle has drawn a small amount of blood which is visible. The image has a pink and purple filter over it.

Sensitivity and specificity of HIV tests

A close-up of somebody's hand. They are wearing blue surgical gloves and holding a vial that contains a small amount of blood. The image has a pink and purple filter over it.

Home HIV testing (self-testing and self-sampling)

A man pricks his finger so that he can test himself for HIV. In front of him are the instructions for the test. He is concentrating on pricking his finger. The image has a pink and purple filter over it.