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Calcitriol Unit Converter
1,25-Dihydroxyvitamin D (Calcitriol) is the biologically active hormonal form of Vitamin D. It is synthesized in the kidneys from 25-hydroxyvitamin D (Calcidiol).
Calcitriol levels are regulated by Parathyroid Hormone (PTH) and are distinct from “Total Vitamin D” levels. This test is typically reserved for diagnosing specific disorders of calcium metabolism or kidney failure. Note that Calcitriol circulates in much lower concentrations (pg/mL) than the storage form (ng/mL).
Mass Units (US)
StandardPicograms per milliliter (Common US Unit).
SI Units / Molar
Picomoles per liter (International Standard).
Clinical Context
Reference Ranges (Adults):
• US (Conventional): 18 – 72 pg/mL.
• SI (International): 43 – 173 pmol/L.
Interpretation:
• Low: Chronic Kidney Disease (kidneys cannot convert vitamin D), Hypoparathyroidism.
• High: Sarcoidosis, Lymphoma (extra-renal production), Primary Hyperparathyroidism.
Conversion Logic:
Molecular Weight of Calcitriol: ~416.64 g/mol.
1 pg/mL ≈ 2.40 pmol/L.
1 pmol/L ≈ 0.417 pg/mL.
Clinical References
How to Use This Converter
Follow these steps to normalize Calcitriol values.
Enter Values
Input your laboratory result. Ensure you are looking at 1,25-Dihydroxyvitamin D (pg/mL) and not 25-Hydroxyvitamin D (ng/mL).
Automatic Conversion
The calculator converts between mass units and the SI molar unit using the molecular weight of 416.64 g/mol.
Reset
Use the Clear button to reset all fields.
Frequently Asked Questions
Technically yes, but it is the *active* hormone form. Standard “Vitamin D” tests measure the storage form (25-OH), not Calcitriol (1,25-OH).
Yes. 1 picogram per milliliter is numerically identical to 1 nanogram per liter.