{"id":"cd3-t-cells-percent","name":"CD3+ T Cells, percent","shortName":"CD3 %","aliases":["CD3 %","CD3+ Percent","% CD3+","CD3 Cells %","T Cells %","CD3+ T Cells %","CD3 Percent","% CD3","Total T Cells %","T Lymphocytes %","CD3+ T Lymphocytes, percent","CD3 (T Cells) %","% T Cells","Percent CD3 Lymphocytes"],"abbreviations":["CD3 pct"],"loinc":[{"code":"20599-7","primary":true},{"code":"8124-0","primary":false}],"specimen":"whole-blood","units":[{"ucum":"%","display":"%"}],"referenceRanges":[{"population":"65+","low":62,"high":89,"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"}]}],"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 T cells, which carry a marker called CD3. The absolute count is usually more useful.","url":"https://bloodtesttracker.com/markers/cd3-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."}