HIV Viral Load Test
An HIV viral load test measures the amount of HIV in your blood. It helps guide treatment decisions and checks how well your HIV medicines are working.
What this test measures
The test measures the amount of HIV genetic material (RNA) in a sample of your blood using molecular tests like PCR.
What your results mean
Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.
Higher-than-normal results
A high viral load means the virus is growing and your treatment is not working well. The higher the viral load, the more risk you have for infections and diseases related to a weak immune system. It may also mean you have a higher risk for developing AIDS.
Lower-than-normal results
A low viral load means your medicine is stopping the virus from growing and your infection is unlikely to get worse. An undetectable viral load means you have so little HIV that the test can't find it, meaning your medicines are working well and you are unlikely to spread HIV through sex.
Frequently asked questions
What is an HIV viral load test?
It measures the amount of HIV in your blood using molecular tests like PCR.
How is the test used?
It is mainly used to guide treatment decisions, check how well HIV medicines are working, and monitor changes in your infection.
What does an undetectable viral load mean?
It means the test cannot find HIV in your blood. Your medicines are working well, and you are unlikely to spread HIV through sex. But you are not cured and must keep taking your medicines.
What does a high viral load mean?
It means the virus is growing and your treatment is not working well. You may need a change in medicines.
Can this test diagnose HIV?
Yes, in certain cases, such as when the risk of HIV is very high or for testing newborns. But usually screening tests are used first.
Related lab tests
Sources
- MedlinePlus: HIV Viral Load — NIH MedlinePlus
Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.