Medical Health Encyclopedia

Injury Disease Nutrition Poison Symptoms Surgery Test Special Topic

1 2 5 A B C D E F G H I J K L M N O P Q R S T U V W X

Blood test

Overview Risks Results

T (thymus derived) lymphocyte count

Alternative Names: T cell counts; CD4 count; CD3 count; T-lymphocyte count Normal Values: Lymphocytes make up 16-45% of white blood cells. Of those lymphocytes, about half are T cells, a quarter are B cells, and another quarter are natural killer cells. Helper T-cells, also known as absolute CD4+ or T4 count: more than 400 per microliter, or 32-68% of lymphocytes Suppressor T-cells, also known as absolute CD8+ or T8 count: 150-1000 per microliter Text Continues Below There are several ways to count T cells and the normal range may vary with the method used. What abnormal results mean: Greater-than-normal T-cell levels may indicate: Infectious mononucleosis (sometimes) Multiple myeloma Acute lymphocytic leukemia Less-than-normal T-cell levels may indicate: Congenital T-cell deficiency (rare) Congenital immunodeficiency disorders Acquired immunodeficiency disorders Leukemias Cancer Hodgkin's Acute viral infection Waldenstrom's macroglobulinemia AIDS Side effect of radiation therapy Effect of aging

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org). The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2004 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.