Quick Answer
For a healthy adult not living with HIV, a normal CD4 count is typically between 500 and 1,200 cells per cubic millimeter. For people with HIV, a CD4 count above 500 with an undetectable viral load indicates a strong immune system. Regular CD4 monitoring helps guide HIV management.
- Normal CD4 range for healthy adults is 500-1,200 cells/mm³.
- HIV attacks CD4 cells; untreated, counts fall.
- Antiretroviral therapy aims to keep CD4 above 500 and viral load undetectable.
- A CD4 count below 200 defines AIDS diagnosis.
- U=U means undetectable viral load prevents HIV transmission.
- CD4 testing uses a blood sample analyzed by flow cytometry.
The Short Version, Structured
CD4 cells are white blood cells that coordinate the immune response. HIV specifically infects and destroys these cells, weakening the body's defenses. Monitoring CD4 count helps clinicians assess immune health and track HIV progression. A normal count indicates a robust immune system, while a low count signals vulnerability to infections. Modern antiretroviral therapy can restore CD4 levels and achieve an undetectable viral load, allowing people with HIV to live long, healthy lives without transmitting the virus to partners (U=U).
Related Questions
Sources & Further Reading
- CDC — Sexually Transmitted Infections
- CDC STI Treatment Guidelines
- WHO — Sexually transmitted infections fact sheet
- MedlinePlus — Sexually Transmitted Diseases
Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.