Measurement of serum 25-OH vitamin D concentrations provide a good index of circulating vitamin D activity in patients not suffering from renal disease. Lower than normal 25-OH vitamin D levels can result from a dietary deficiency, poor absorption of the vitamin or impaired metabolism of the sterol in the liver. A 25-OH vitamin D deficiency can lead to bone diseases such as rickets and osteomalacia. Above normal levels can lead to hypercalcemia. This assay employs liquid chromatography tandem mass spectrometry to independently measure and report the two common forms of 25-hydroxy vitamin D: 25-OH D3 - the endogenous form of the vitamin and 25-OH D2 - the analog form used to treat 25-OH Vitamin D3 deficiency.
Fasting preferred, but not required
Collect blood in a standard red-top serum Vacutainer(R) tube. Allow
blood to clot at room temperature. Centrifuge and separate the serum
from the cells immediately.
Alternatively, collect blood in a serum separator tube, allow to clot
at room temperature. Centrifuge and remove from the gel within 48
Reported (Analytical Time)
The CPT codes provided are based on AMA guidelines and are for informational purposes only.
CPT coding is the sole responsibility of the billing party.
Please direct any questions regarding coding to the payer being billed.
Clarify code - only for Quest sites. Reject Criteria: Gross hemolysis; grossly lipemic; heparinized or EDTA plasma; serum not separated from serum separator tube gel or clot within 48 hours; grossly icteric Transport Temperature: Room temperature Methodology: Chromatography/Mass Spectrometry