CD4 Absolute Count Unit Converter

The CD4 absolute count measures the number of CD4+ T cells (also called helper T cells or T4 cells) in a sample of your blood. These white blood cells play a central role in coordinating your immune response by signaling other immune cells to find and destroy bacteria, viruses, and other pathogens.

A normal CD4 count in healthy adults typically falls between 500 and 1,200 cells per cubic millimeter of blood. The count reflects the overall strength of your immune system and is most commonly used to monitor immune health in people living with HIV.

CD4 counts are also used in other clinical settings, including organ transplant monitoring, lymphoma diagnosis, and evaluation of primary immunodeficiency disorders such as DiGeorge syndrome.

CD4+ T cells originate from stem cells in the bone marrow and mature in the thymus gland. Once mature, they circulate through the blood, lymph nodes, and spleen, where they coordinate immune responses.