Test ID: Q0223
CPT code: 82652
Specimen Type: SERUM
Frequency: Mon, Wed, Fri; analytic time 4 days
Instructions: 1.0 mL serum from Red or SST (0.5 mL Minimum). Refrigerate.
Text: Vitamin D originating from dietary and endogenous sources is converted to25-hydroxyvitamin D in the liver, and subsequently to 1-25 Dihydroxy vitamin D in the kidney. Deficiencies of 1-25 Dihydroxy vitamin D, the most active form, cause hypocalcemia, osteomalacia, and related disorders. Measurement is useful in: differentiating primary hyperparathyroidism from hypercalcemia of cancer; distinguishing between vitamin D dependent and vitamin D resistant rickets; monitoring vitamin Dstatus of patients with chronic renal disease; and, assessing compliance to therapy.