{"id":"cd4-t-cells-percent","name":"CD4+ T Helper Cells, percent","shortName":"CD4 %","aliases":["CD4 %","CD4+ Percent","% CD4+","CD4 Cells %","T Helper Cells %","CD4 Percent","% CD4","CD4+ T Cells %","CD3+CD4+ %","CD3+CD4+ Percent","T4 Helper Cells %","Helper T Cells %","CD4+ T Lymphocytes, percent","Percent CD4 Lymphocytes"],"abbreviations":["CD4 pct"],"loinc":[{"code":"8123-2","primary":true}],"specimen":"whole-blood","units":[{"ucum":"%","display":"%"}],"referenceRanges":[{"population":"65+","low":35,"high":68,"unit":"%","unitDisplay":"%","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 share of your lymphocytes that are CD4+ T helper cells. It is read together with the CD4 count.","url":"https://bloodtesttracker.com/markers/cd4-t-cells-percent","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}