Bone metabolism

1,25-Dihydroxyvitamin D unit converter

Active vitamin D hormone (calcitriol); used in kidney and calcium disorders

Also known as: Calcitriol, 1,25(OH)2D

Converter

Enter a value in any unit and all other units fill in.

pg/mL pmol/L ng/dL

Worked example

29.16 pg/mL (middle of the reference range) = 70 pmol/L

Conversion formulas

pmol/L	pmol/L = pg/mL × 2.4	pg/mL = pmol/L × 0.4166
ng/dL	ng/dL = pg/mL × 0.1	pg/mL = ng/dL × 10

Good to know

1,25-dihydroxyvitamin D (calcitriol) is reported in pmol/L or in pg/mL.

pmol/L × 0.4166 = pg/mL (exact factor 0.41664).
Ranges differ a lot between assays, so compare your result only with the range printed on your own report.

Reference range

Unit	Adults
pg/mL	8.33 – 50
pmol/L	19.99 – 120
ng/dL	0.833 – 5

Source: Newcastle Hospitals Laboratories: 1,25-Dihydroxycholecalciferol · Last reviewed: 2026-10-19

Note from the source: 20-120 pmol/L (about 8-50 pg/mL) (Newcastle Hospitals Laboratories, referral to Glasgow Royal Infirmary). Older US ranges of about 18-78 pg/mL differ because assays differ

Frequently asked questions

How do I convert 1,25-Dihydroxyvitamin D from pg/mL to pmol/L?

pmol/L = pg/mL × 2.4. In the other direction: pg/mL = pmol/L × 0.4166.

What is the reference range of 1,25-Dihydroxyvitamin D?

For adults the range is 8.33 – 50 pg/mL (Newcastle Hospitals Laboratories: 1,25-Dihydroxycholecalciferol). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for 1,25-Dihydroxyvitamin D?

Common units are pg/mL, pmol/L, ng/dL.