{"id":"cd4-t-cells-absolute","name":"CD4+ T Helper Cells, absolute","shortName":"CD4 count","aliases":["Absolute CD4","CD4 Absolute","CD4 Abs Cnt","CD4+ Cells, Absolute","T Helper Cells, Absolute","CD4 Count","CD4+ T Cell Count","CD4 T-Cell Count","Absolute CD4 Count","CD3+CD4+ Absolute","CD3+CD4+ Abs Cnt","CD4+ T Lymphocytes, Absolute","T4 Helper Cells, Absolute","Helper T Cells, Absolute","T4 Absolute","Absolute CD3+CD4+ Cells","Linfocitos T CD4 absolutos"],"abbreviations":["CD4 abs","Th cells"],"loinc":[{"code":"24467-3","primary":true},{"code":"32515-9","primary":false}],"specimen":"whole-blood","units":[{"ucum":"/uL","display":"cells/µL"},{"ucum":"10*9/L","display":"×10⁹/L"},{"ucum":"10*3/uL","display":"×10³/µL"}],"referenceRanges":[{"population":"65+","low":490,"high":1600,"unit":"/uL","unitDisplay":"cells/µL","note":"ARUP Laboratories interval for ages 65 and older.","sources":[{"title":"Lymphocyte Subset Panel 4 - T-Cell Subsets Percent and Absolute, Whole Blood (test 0095950)","url":"https://ltd.aruplab.com/Tests/Pub/0095950","publisher":"ARUP Laboratories"},{"title":"Lymphocyte Subset Panel 2 - CD4 Percent and Absolute (test 0095885)","url":"https://ltd.aruplab.com/Tests/Pub/0095885","publisher":"ARUP Laboratories"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The number of CD4+ T helper cells in a microliter of blood. These white blood cells help direct your immune response.","url":"https://bloodtesttracker.com/markers/cd4-t-cells-absolute","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}