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Test ID: Q0223

VITAMIN D, 1,25-DIHYDROXY

  • CPT Code: 82652
  • LOINC: 62290-2
  • 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.
  • Methodology: Chemiluminescence

 

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