CD4+ Count

T-Lymphocyte Measurement

Results

A CD4+ count is a blood test to determine how well the immune system is working in people who have been diagnosed with human immunodeficiency virus (HIV). CD4+ cell count results are generally available in 1 to 3 days, depending on the lab.

Total CD4+ count

Normal:	CD4+ cell counts in people who are not infected with HIV usually range from 600 to 1,200 cells per microliter (µL).
	A CD4+ cell count greater than 350 cells/µL usually indicates a low risk for opportunistic infections.
Abnormal:	A CD4+ cell count of fewer than 350 cells/µL indicates a weak immune system and an increased risk for opportunistic infections. Antiretroviral treatment for HIV may be offered when the CD4+ count is between 200 and 350 cells/µL.
	A CD4+ cell count of fewer than 200 cells/µL indicates acquired immunodeficiency syndrome (AIDS) and a high risk for opportunistic infections. Antiretroviral treatment is recommended at this time.

As the CD4+ count drops, it becomes more likely that acquired immunodeficiency syndrome (AIDS) will develop.

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Author:	Maria G. Essig, MS, ELS	Last Updated: March 1, 2007
Medical Review:	E. Gregory Thompson, MD - Internal Medicine Peter Shalit, MD, PhD - Internal Medicine
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