Testing & health monitoring

Information about both the tests that are used to diagnose HIV and those used to monitor the health of people living with HIV, including viral load and CD4 counts.

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Basic information

How do I know if I have HIV?

Where can I get an HIV test?

What does an HIV test involve?

Better off knowing Illustrated

Testing Illustrated

What does ‘reactive’ mean when testing for HIV?

What does ‘non-reactive’ mean when testing for HIV?

What does ‘indeterminate’ mean when testing for HIV?

What is p24 antigen?

CD4 and viral load Illustrated

What does undetectable mean?

Undetectable viral load Illustrated

Health checks Illustrated

Find a free HIV test near you

European test finder

HIV testing

Home HIV testing

What is the window period for HIV testing?

Sensitivity and specificity of HIV tests

False positive results on HIV tests

False negative results on HIV tests

CD4 cell counts

CD4/CD8 ratio

Viral load

What are logs in viral load results?

Blood tests before starting or changing HIV treatment

Other blood tests

Blood problems and HIV

How accurate are rapid, point-of-care tests for HIV? A research briefing

How accurate are fourth-generation combination tests for HIV diagnosis? A research briefing

How accurate are self-sampling kits for HIV? A research briefing

How accurate is self-testing for HIV? A research briefing

Are HIV tests accurate in people taking HIV treatment, PrEP or PEP? A research briefing