1,25 Dihydroxy Vitamin D, Adult - Preferred for evaluating hypercalcemia or renal failure
| Abbrev Code: | VIT125 | ||
| Order Code: | LAB6615 | Order Name: | 1,25 Dihydroxy Vitamin D |
| Synonyms: | 1, 25 Dihydroxycholecalciferol, Vitamin D | ||
| Methodology: | Chemiluminescent immunoassay | ||
| CPT Codes: | 82652 x1 | ||
| Turnaround Time: | Testing is performed 2 times per week. Results are reported 3-7 days. | ||
| Special Instructions: | Verify with the physician whether they are diagnosing Vitamin D deficiency or evaluating the patient for hypercalcemia or renal failure. Order VITD (LAB535) for deficiency. | ||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 1 mL |
| Minimum\Peds Volume: | 0.8 mL |
| Container: | Red or gold (gel) Alternate Containers: Green (lithium heparin, gel), Purple (EDTA), Red (no gel) |
| Causes for Rejection: | Grossly hemolyzed, icteric or lipemic samples as well as samples containing particulate matter. |
Processing and Shipping
| Specimen Processing: | Centrifuge and aliquot 1 mL, 0.3 mL minimum. Store at room temperature or refrigerated. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | Stability: Samples are stable for 1 week at room temperature, 2 weeks refrigerated and 6 months frozen. |
| Test Performed at or Referral Lab | UM Specialty Core/Prot/Endo (Liaison D) |
Interpretive
| Reference Range: | Adult: 19.9 - 79.3 pg/mL
Pediatric reference ranges are not available; order 1,25 Dihydroxy Vitamin D to Mayo-Pediatric with same name for pediatric patients. |
| Use: | Vitamin D testing is not covered by government payers for screening. This test does not need to be ordered in combination with Total 25-Hydroxyvitamin D. This test is indicated for patients with renal failure, unexplained hypercalcemia or hypercalciuria (suspected granulomatous disease or lymphoma), suspected genetic childhood rickets or suspected tumor-induced osteomalacia. The recommended test for diagnosing Vitamin D deficiency is Total 25-Hydroxyvitamin D. |
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