{"id":"vitamin-d-1-25-dihydroxy","name":"Vitamin D (1,25-Dihydroxy)","shortName":"1,25-Dihydroxy Vitamin D","aliases":["1,25-Dihydroxyvitamin D","Calcitriol","1,25(OH)2D","1,25-Dihydroxy Vitamin D, Total","Vitamin D, 1,25-Dihydroxy","Vitamin D, 1, 25-Dihydroxy","1,25 Dihydroxy Vitamin D","1,25-(OH)2 Vitamin D","1,25-Dihydroxycholecalciferol","1,25-Dihydroxyvitamin D2 and D3","Calcitriol (1,25-Dihydroxy Vitamin D)"],"abbreviations":["1,25(OH)2D","1,25-(OH)2D"],"loinc":[{"code":"1649-3","primary":true},{"code":"62290-2","primary":false},{"code":"14566-4","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"pg/mL","display":"pg/mL"},{"ucum":"pmol/L","display":"pmol/L"}],"referenceRanges":[{"population":"Adults","low":19.9,"high":79.3,"unit":"pg/mL","unitDisplay":"pg/mL","note":"ARUP (immunoassay; its page gives no age or sex split). Quest's LC-MS/MS test 16558 prints 18-72 pg/mL for adults (as listed by a hospital lab directory and by Fullscript), so labs differ slightly. This test has no standard reference material, so intervals are method-specific. A review lists 43-168 pmol/L (about 18-70 pg/mL) for the IDS RIA, 63-228 pmol/L (about 26-95 pg/mL) for the IDS iSYS immunoassay and 59-159 pmol/L (about 25-66 pg/mL) for LC-MS/MS. Use the interval printed on your own report. Mayo and Labcorp intervals were not opened.","sources":[{"title":"Vitamin D, 1,25-Dihydroxy (test 0080385)","url":"https://ltd.aruplab.com/Tests/Pub/0080385","publisher":"ARUP Laboratories"},{"title":"Calcitrol 1,25-Dihydroxyvitamin D (Quest Diagnostics send-out test 16558, adult interval as listed by Parkview Health Laboratory)","url":"https://lab.parkview.com/test-directory/calcitrol-1-25-dihydroxyvitamin-d/","publisher":"Parkview Health Laboratory"},{"title":"Vitamin D Metabolites: Analytical Challenges and Clinical Relevance","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC8892115/","publisher":"Calcified Tissue International","year":2022}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures calcitriol, the active hormone form of vitamin D, to look into calcium, kidney and bone questions rather than to check vitamin D status.","url":"https://bloodtesttracker.com/markers/vitamin-d-1-25-dihydroxy","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}