A CD4 count, also known as a T-cell count, is a blood test that measures the number of CD4+ T lymphocytes in the body. These cells are crucial for the immune system and play a vital role in fighting infections, particularly HIV. 

Normal Range: 

• The normal range for CD4 counts is typically between 500 and 1400 cells per microliter (cells/µL). 

However, this range may vary slightly depending on factors such as age and overall health. 

Interpretation: 

• Low CD4 Count: A low CD4 count (below 500 cells/µL) may indicate: 

• HIV infection 

Other immune disorders  Certain medications 

High CD4 Count:

A high CD4 count (above 1400 cells/µL) is less common and may be associated with:

• Certain blood cancers 

Autoimmune disorders