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HIV Viral Load - Topic Overview

Viral load is a measurement of how much HIV is present in your blood. A sample of blood is drawn and sent to a lab for testing. Results are expressed as the number of copies of the virus per milliliter of blood. Each virus is called a "copy" because HIV reproduces by making copies of itself (replicating).

The viral load test gives a more accurate picture than a CD4+ cell count of what the virus is doing in your body at the moment. (The CD4+ test measures the effect HIV is having on your immune system.) The viral load test is used to help decide when to start treatment with medicines (antiretroviral therapy) and when to change antiretroviral medicines.

Recommended Related to HIV/AIDS

The Difference Between HIV and AIDS

HIV is the virus that can become AIDS. AIDS is defined as the most advanced stage of the virus, where the immune system has become so damaged that you're vulnerable to infection and cancers that come from infections. Those are called opportunistic illnesses, because they take advantage of your weakened immune system. They are often fatal. 

Read the The Difference Between HIV and AIDS article > >

    This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

    WebMD Medical Reference from Healthwise

    Last Updated: April 05, 2012
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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