VVitals Vault
Sign in
Bone

1,25-Dihydroxyvitamin D

The active form of vitamin D, made by the kidneys from the stored form under instruction from parathyroid hormone.

Unit pg/mLTypical adult range 19.9–79.3 pg/mL
What it is

The active form of vitamin D, made by the kidneys from the stored form under instruction from parathyroid hormone.

Why it matters

It answers a different question from ordinary vitamin D: not how much you have stored, but how hard your body is working to activate it.

Reading the number

This is not the test for vitamin D deficiency -- the stored 25-OH form is. Counter-intuitively, this value is often normal or high when stores are low, because PTH is pushing activation. Its half-life is hours, so it is a snapshot.

What moves it
parathyroid hormonekidney functionstored vitamin Dphosphate level
Read alongside
Vitamin DParathyroid hormone (intact)CalciumPhosphate
When to raise it

Worth reading with stored vitamin D and PTH rather than on its own.

Tracking only, not a diagnosis. The range above is a typical adult reference range — the range printed by the lab that ran your test is the one that applies to you. Discuss anything that concerns you with your doctor.

Also known as

On a report in another language.

A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under 1,25-Dihydroxyvitamin D.

1,25-Dihidroxi-Vitamina DCalcitriol1,25-OH-Vitamin D

Track your 1,25-dihydroxyvitamin d over time.

1,25-Dihydroxyvitamin D is one of 165 analytes Vitals Vault charts over time. Import a lab report in any language and this number lands on a timeline only you can read.

Continue with Google
Tracking only. This app is not medical advice. Always discuss results and future analysis with your doctor.

Catalog entry last updated 2026-08-28. Browse all 165 metrics.