Nutrition
Vitamin D
Vitamin D status is commonly assessed using 25-hydroxyvitamin D.
Understanding the result
This differs from the active 1,25-dihydroxy form. Confirm which assay appears on the order and report.
Reading your report
Use the units, method and reference interval on your laboratory report. Your clinician can interpret the result alongside your history and other findings.
Sources & further reading
Educational summary · September 2026