T-cell helper (CD4) subset panel
A CD4 count is a blood test that measures the number of CD4 cells in a sample of your blood. CD4 cells are a type of white blood cell that circulates throughout the body in the blood. They're also called CD4 T lymphocytes or "helper T cells." That's because they help fight infection by triggering your immune system to destroy viruses, bacteria, and other germs that may make you sick.
Source: MedlinePlus, U.S. National Library of Medicine4 tests in this panel
| Test | Unit | Normal range | Source |
|---|---|---|---|
| CD3+CD4+ (T4 helper) cells | /µL | 430–1800 cells/µL * | ARUP Laboratories Test Directory |
| CD3+CD4+ (T4 helper) cells/cells | % | see test | ARUP Laboratories Test Directory, Mayo Clinic Laboratories (Pediatric Test Catalog) |
| CD45 (Lymphs) cells | /µL | — | |
| Lymphocytes | ×10⁹/L | 0.95–4.95 ×10⁹/L * | American Board of Internal Medicine (Laboratory Test Reference Ranges), Mayo Clinic Laboratories (Pediatric Test Catalog), Mayo Clinic Laboratories (Test Catalog) |
Adult reference ranges, attributed to the labs that publish them; * marks a range that varies by sex or age — see the test for the full breakdown. A dash means we hold no cited adult range for that test yet.