|Test||VITAMIN D, 25-HYDROXY, TOTAL , SERUM|
|Methodology||Chemiluminescent Microparticle Immunoassay (CMIA)|
|Description||Useful for assessing a patient's Vitamin D status, evaluating hypo- and hypercalcemia, and investigating causes of osteomalacia. This test measures total 25-Hydroxy forms of Vitamin D (25OH -D2 plus 25OH-D3) circulating in the blood. This includes dietary and supplements of either 25OH-D2 or 25OH-D3, as well as 25OH-D3 produced through sun (UV-B) exposure.
NOTE: This test, when ordered on Medicare patients, is subject to the National Coverage Determination (NCD) policy. Please verify that the diagnosis code (ICD-9) you have chosen demonstrates medical necessity for the test as documented in the physician's patient record. The CMS web site or the NorDx Limited Coverage Documentation Guide are available to assist you with this verification. A properly executed Advance Beneficiary Notice (ABN) must be submitted with the specimen if medical necessity is not demonstrated by the ICD-9 code chosen.
|Specimen||Draw blood in a plain, red-top or serum gel tube. Spin down and send 1.0 mL (minimum 0.3 mL) of serum refrigerated.|
|Reference Values||< 13 ng/mL (Deficient)
13 - 24 ng/mL (Inadequate)
25 - 50 ng/mL (Sufficient)
> 51 ng/mL (Possibly harmful level - this is a suggested range according to the IOM/CDC 2011 guidelines, please interpret within the clinical context.)
|Analytic Time||1 Day|
|Day(s) Test Set Up||Monday through Friday|