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.
Methodology: Liquid Chromatography Tandem Mass Spectrometry
1 yellow-top SST tube. Suggested to be drawn following an overnight (8-10 hour) fast. Centrifuge red-top 30 minutes after draw. Refrigerate specimen after collection.
Analytical Time: 4 days
Days Set Up: Monday through Friday