{"id":"vitamin-d-25-hydroxy","name":"Vitamin D (25-Hydroxy)","shortName":"Vitamin D","aliases":["Vitamin D, 25-Hydroxy","Vitamin D, 25-Hydroxy, Total","Vitamin D 25-OH","25-OH Vitamin D","25-Hydroxyvitamin D","25-Hydroxy Vitamin D Total","25(OH)D","25(OH) Vitamin D","Vitamin D Total","Total Vitamin D","Calcidiol","Calcifediol","Vitamin D3+D2, 25-Hydroxy","Vit D 25-OH","VITAMIN D,25-OH,TOTAL,IA","25-hydroxy vitamin D2 + D3","Vitamin D (25 OH)"],"abbreviations":["25(OH)D","25-OHD","VitD"],"loinc":[{"code":"62292-8","primary":true},{"code":"35365-6","primary":false},{"code":"1989-3","primary":false},{"code":"14635-7","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"ng/mL","display":"ng/mL"},{"ucum":"nmol/L","display":"nmol/L"}],"referenceRanges":[{"population":"Adults","low":30,"high":100,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Typical US commercial-lab interval. It is a treatment-target convention, not the central 95% of a healthy population.","sources":[{"title":"Vitamin D, 25-Hydroxy, Total, Immunoassay (test code 17306)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/17306/vitamin-d-25-hydroxy-total-immunoassay?cc=MASTER","publisher":"Quest Diagnostics"},{"title":"Vitamin D, 25-Hydroxy (test 081950)","url":"https://www.labcorp.com/tests/081950/vitamin-d-25-hydroxy","publisher":"Labcorp"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The main form of vitamin D circulating in your blood, and the standard way to check your vitamin D status.","url":"https://bloodtesttracker.com/markers/vitamin-d-25-hydroxy","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}