{"id":"vitamin-a","name":"Vitamin A (Retinol)","shortName":"Vitamin A","aliases":["Vitamin A","Retinol","Vitamin A, Serum","Retinol, Serum","Vitamin A, Plasma","Vitamin A (Retinol), Serum or Plasma","Vitamin A, Serum or Plasma","Retinol, Serum or Plasma","Serum Retinol","Plasma Retinol","Vitamin A Level","Vitamin A, S"],"abbreviations":["Vit A"],"loinc":[{"code":"2923-1","primary":true},{"code":"14905-4","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"ug/dL","display":"µg/dL"},{"ucum":"umol/L","display":"µmol/L"},{"ucum":"mg/L","display":"mg/L"},{"ucum":"ug/L","display":"µg/L"}],"referenceRanges":[{"population":"18+","low":32.5,"high":78,"unit":"ug/dL","unitDisplay":"µg/dL","note":"Mayo Clinic Laboratories adult interval, set with fasting samples. ARUP prints a wider adult interval of 0.30 to 1.20 mg/L (30 to 120 µg/dL). Use the range printed on your own report.","sources":[{"title":"Vitamin A, Serum (test VITA)","url":"https://www.mayocliniclabs.com/test-catalog/overview/42357","publisher":"Mayo Clinic Laboratories"},{"title":"Vitamin A (Retinol), Serum or Plasma (test 0080525)","url":"https://ltd.aruplab.com/Tests/Pub/0080525","publisher":"ARUP Laboratories"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures retinol, the main blood form of vitamin A, which supports vision, immune defenses and skin and is mostly stored in the liver.","url":"https://bloodtesttracker.com/markers/vitamin-a","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}