CD4 Count
A blood test that counts CD4 immune cells, showing the strength of the immune system in HIV.
Quick Summary
To assess immune health in people with HIV.
CD4 cells per cubic millimetre.
No preparation needed.
Overview
CD4 cells are attacked by HIV.
Low counts increase the risk of opportunistic infections.
What It Measures
CD4 count
Immune cell number.
How It's Performed
- 01
Preparation
Usually no special preparation. Tell the staff about medicines you take.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm with a thin needle.
- 03
Afterwards
Press on the spot for a minute. A small bruise is common; you can go back to normal activities.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| CD4 (adults) | 500–1,500 | cells/mm³ |
Interpreting Results & Next Steps
Discuss with Doctor
Normal ranges differ between laboratories, ages and sexes; always use the range printed on your report and ask your doctor what your results mean.
If values are Low:
Low counts mean a weaker immune system and higher infection risk.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- CD4 Lymphocyte Count(opens in a new tab) · MedlinePlus, US National Library of Medicine