{"id":"cd4-cd8-ratio","name":"CD4/CD8 Ratio","shortName":"CD4/CD8 ratio","aliases":["Helper/Suppressor Ratio","T4/T8 Ratio","CD4/CD8","CD4:CD8 Ratio","CD4 CD8 Ratio","T4:T8 Ratio","CD3+CD4+/CD3+CD8+ Ratio","Helper to Suppressor Ratio","Helper:Suppressor Ratio","CD4/CD8 T-Cell Ratio","Relación CD4/CD8"],"abbreviations":["CD4/CD8","T4/T8","H/S ratio"],"loinc":[{"code":"54218-3","primary":true},{"code":"20607-8","primary":false}],"specimen":"calculated","units":[{"ucum":"{ratio}","display":"ratio"}],"referenceRanges":[{"population":"65+","low":0.8,"high":6.17,"unit":"{ratio}","unitDisplay":"ratio","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":"CD4 helper T cells divided by CD8 cytotoxic T cells. It shows how those two groups of T cells balance.","url":"https://bloodtesttracker.com/markers/cd4-cd8-ratio","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}