N-Telopeptide, Cross-Linked, Urine
| Abbrev Code: | UNTELU | ||
| Order Code: | LAB3848 | Order Name: | N Telopeptide, Cross-Linked Urine |
| Synonyms: | NTx; Crosslinked N-telopeptide of Type 1 Collagen; N Telopeptide Crosslinked | ||
| Methodology: | Chemiluminescent immunoassay | ||
| CPT Codes: | 82523 x1 | ||
| Turnaround Time: | Specimens are sent to reference laboratory Mon-Sat; results are reported in 1-4 days. | ||
| Special Instructions: | For monitoring therapy, a baseline sample should be collected prior to initiation of therapy. Subsequent samples for comparison should be collected at the same time of day as the baseline sample. | ||
| Associated Links: | |||
Collection Instructions
| Specimen: | Urine, second morning void (preferred) or timed |
| Optimal Volume: | Submit entire collection; analysis requires 0.5 mL |
| Container: | Plastic leakproof container, sterile Alternate Containers: 3 L plastic jug |
| Collection Instructions: | Refrigerate during collection, Collect without preservative. |
| Causes for Rejection: | Collected with preservative, contaminated with blood or extensive hemolysis. |
Processing and Shipping
| Specimen Processing: | Mix collection well before aliquot is taken. Aliquot 1 mL, 0.5 mL minimum. |
| Shipping Instructions: | Ship on dry ice. |
| Stability: | 24 hours at room temperature; 7 days refrigerated; 2 years frozen. |
| Test Performed at or Referral Lab | Lab Sendouts (ARUP) |
| Referral Lab number: | 70062 |
Interpretive
| Reference Range: |
A decrease of 30-40% from the NTx baseline after 3 months of therapy is a typical response to anti-resorptive therapy. A reference range for children under 7 years of age is not provided by the reference laboratory.
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| Use: | Estimation of bone resorption. |
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