Determination of Reference Intervals for Serum Total Vitamin D in Indian Population

Widespread vitaminD in sufficiency raises concerns regarding their liability of reference intervals for serum vitaminD levels. We sought to determine the reference intervals for serum vitamin D [25-hydroxyvitamin D [25 (OH) D]] deficiency [less than20ng/mL (20nmol/L) by global definition]. This was a retrospective study of laboratory data obtained from all patients at P. K. Das medical college from April 2015 to June-2016, through 2000 subjects. Patients taking vitaminD supplement were excluded. Total serum 25 (OH) D was determined by chemiluminescence method (CLIA) using AbbottimmunologyanalyzerArchitectI1000.