{"id":"vitamin-c","name":"Vitamin C (Ascorbic Acid)","shortName":"Vitamin C","aliases":["Vitamin C","Ascorbic Acid","Vitamin C, Plasma","Ascorbate","Vitamin C (Ascorbic Acid), Plasma","Ascorbic Acid (Vitamin C), Plasma","Ascorbic Acid, P","Vit C"],"abbreviations":["Vit C"],"loinc":[{"code":"1903-4","primary":true},{"code":"14622-5","primary":false}],"specimen":"plasma","units":[{"ucum":"mg/dL","display":"mg/dL"},{"ucum":"umol/L","display":"µmol/L"},{"ucum":"mg/L","display":"mg/L"}],"referenceRanges":[{"population":"Adults","low":0.4,"high":2,"unit":"mg/dL","unitDisplay":"mg/dL","note":"Mayo Clinic Laboratories, heparin plasma by LC-MS/MS. ARUP prints 23-114 umol/L, which is about the same (0.41-2.01 mg/dL). In healthy people, blood levels level off at about 70-80 umol/L (1.2-1.4 mg/dL) with oral intake (Lykkesfeldt 2019), so results above that usually reflect recent supplements. Quest prints sex-specific adult intervals of 0.2-2.1 mg/dL (men) and 0.3-2.7 mg/dL (women), so labs differ at both ends; Labcorp was not opened. Use the interval printed on your own report.","sources":[{"title":"Ascorbic Acid (Vitamin C), Plasma - Test ID VITC (Mayo Clinic Laboratories Extended Catalog)","url":"https://www.testcatalog.org/show/VITC","publisher":"Mayo Clinic Laboratories"},{"title":"Vitamin C (Ascorbic Acid), Plasma (test 0080380)","url":"https://ltd.aruplab.com/Tests/Pub/0080380","publisher":"ARUP Laboratories"},{"title":"Micronutrient, Vitamin C (Quest Diagnostics test, adult intervals as listed by Fullscript)","url":"https://us.fullscript.com/labs/quest/micronutrient-vitamin-c","publisher":"Fullscript (listing Quest Diagnostics test data)"},{"title":"The Pharmacokinetics of Vitamin C","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC6835439/","publisher":"Nutrients","year":2019}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures vitamin C (ascorbic acid) in plasma, mostly to check whether you are low on this vitamin.","url":"https://bloodtesttracker.com/markers/vitamin-c","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}