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Vitamin D, 1, 25-dihydroxy Testing

Calcitriol; 1,25(OH) Vitamin D; 1,25-Dihydroxycholecalciferol
Sample Report
Specimen Type: Blood


This test is used to measure Vitamin D levels in the blood.  The Vitamin D 25-Dihydroxy test measures the active form of Vitamin D which if produced in the liver and kidneys through the conversion of Vitamin D 25-Hydroxy.  This test is not typically used as a routine measurement to assess if a person has a vitamin D deficiency because it may show normal results even if a person has an overall deficiency.  It is more useful when a person is suspected of having a condition which is producing an excess of vitamin D such as Sarcoidosis or certain types of Lymphoma.  This test may also be ordered to aid in the diagnosis or Parathyroid disorder or kidney failure.

For a test which is more commonly used to detect if a person may be suffering from a Vitamin D Deficiency, customers may order the Vitamin D 25-Hydroxy Test.

Turnaround time for the Vitamin D, 1, 25-dihydroxy is typically 2-3 business days.

Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.


The Vitamin D, 1, 25-dihydroxy test requires no isotopes be administered 24 hours prior to blood collection. Isotopes may be found in certain medications which may cause the testing to be rejected. Please contact the physician who is ordering your prescription to learn whether the medication you are taking may interfere with this testing.



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