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 500 to 1,500 cells per microliter (mcL).
	A CD4+ cell count greater than 350 cells/mcL usually indicates a low risk for opportunistic infections.
Abnormal:	A CD4+ cell count of fewer than 350 cells/mcL indicates a weak immune system and an increased risk for opportunistic infections. Antiretroviral treatment for HIV is recommended when the CD4+ count is below 350 cells/mcL.
	A CD4+ cell count of fewer than 200 cells/mcL indicates acquired immunodeficiency syndrome (AIDS) and a high risk for opportunistic infections. Antiretroviral treatment is recommended.

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: February 17, 2009
Medical Review:	Caroline S. Rhoads, MD - Internal Medicine Peter Shalit, MD, PhD - Internal Medicine
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