Denise Richards reportedly feared she and her children could have HIV after her former husband, Charlie Sheen, privately disclosed his diagnosis to her in 2011, according to a report.

Richards was said to have been 'terrified' she might also test positive and arranged for herself and her children to be tested. The report said their tests were negative. These claims have not been independently verified.

Sheen publicly revealed that he had HIV in November 2015, four years after he said he had been diagnosed. The disclosure brought renewed attention to a question many people may have after learning a partner or former partner has HIV: how soon can a test detect the infection?

How Does HIV Testing Work?

HIV testing is the only reliable way to determine whether someone has HIV. The Centers for Disease Control and Prevention (CDC) recommends that everyone aged 13 to 64 be tested at least once as part of routine healthcare, while people with certain risk factors may need testing more frequently.

There are three main types of HIV tests: nucleic acid tests (NATs), antigen/antibody tests, and antibody tests.

NATs look for HIV's genetic material and can detect infection earlier than other tests. Antigen/antibody tests look for both HIV antigens and antibodies produced by the immune system, while antibody tests detect the body's immune response to the virus.

However, a test taken too soon after exposure may not detect HIV. This is known as the 'window period', the time between potential exposure and when a test can reliably detect infection. Different tests have different window periods, so someone who tests negative shortly after a potential exposure may need to test again later.

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When Should Someone Get Tested?

The timing depends on the type of test used and when the potential exposure occurred.

CDC guidance notes that NATs detect HIV earliest, followed by antigen/antibody tests and then antibody tests. People concerned about a recent exposure should speak with a healthcare professional about which test is appropriate and whether repeat testing is necessary.

Rapid HIV tests and self-tests can also provide results quickly and privately. However, a reactive self-test does not by itself confirm an HIV diagnosis; follow-up testing by a healthcare provider is required.

What if the Test Is Positive?

An HIV diagnosis today is very different from what it meant decades ago. There is no cure for HIV, but effective antiretroviral therapy (ART) can control the virus and help people live long, healthy lives. The CDC recommends starting treatment as soon as possible after diagnosis.

In the US, more than 1.1 million people are estimated to be living with HIV, and 38,793 people aged 13 or older received an HIV diagnosis in 2024.

Treatment can also dramatically reduce the risk of transmitting HIV. People who take ART and maintain an undetectable viral load do not transmit HIV through sex. This principle is commonly known as 'undetectable equals untransmittable', or U=U.

For anyone worried about a possible exposure, testing can provide an answer, but the right test at the right time matters. A healthcare professional can advise when testing should be performed based on the circumstances and timing of the potential exposure.

Frequently Asked Questions

  • What is the window period for HIV testing?
    The window period is the time between potential exposure to HIV and when a test can reliably detect the infection. Different tests have different window periods.
  • What should I do if my HIV test is positive?
    Start antiretroviral therapy (ART) as soon as possible to control the virus and maintain health. Consult with a healthcare provider for further guidance.
  • Can I use a self-test for HIV?
    Yes, rapid HIV tests and self-tests can provide quick and private results, but a reactive self-test requires follow-up testing by a healthcare provider.
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