Collagen Type I C-Telopeptide (CTx)

Collagen Type I C-Telopeptide (CTx)

Test Code

17406
82523
CPT Code is subject to a Medicare Limited Coverage Policy and may require a signed ABN when ordering.
17406
82523
CPT Code is subject to a Medicare Limited Coverage Policy and may require a signed ABN when ordering.
Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano. Please provide SERVICE AREA INFORMATION to find available tests you can order.
In-home collection is not available in your area through Quest Mobile.

Clinical Significance

Collagen Type I C-Telopeptide (CTx) -

CTx is useful to assess bone resorption in patients with metabolic bone disease. The test is also useful in monitoring therapy to slow or halt osteoporotic bone loss.

Test Resources

Test FAQ

Biotin: Interference with Laboratory Assays

Test Details

Patient Preparation

A minimum of 12 hours fasting is required. Fasting morning collection 8-10 am (Diurnal variations cause elevated levels at night).

Dietary supplements containing biotin may interfere in assays and may skew results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.

Methodology

Immunoassay (IA)

Reference Range(s)

Adult Male
18-29 Years87-1200 pg/mL
30-39 Years70-780 pg/mL
40-49 Years60-700 pg/mL
50-68 Years87-345 pg/mL
Adult Female
18-29 Years60-640 pg/mL
30-39 Years60-650 pg/mL
40-49 Years50-465 pg/mL
>49 YearsNot established
Pediatric Male
5-9 Years574-1849 pg/mL
10-13 Years519-2415 pg/mL
14-17 Years435-2924 pg/mL
Pediatric Female
5-9 Years574-1849 pg/mL
10-13 Years519-2415 pg/mL
14-17 Years242-1291 pg/mL

LOINC® Codes, Performing Laboratory

Service Area must be determined

A minimum of 12 hours fasting is required. Fasting morning collection 8-10 am (Diurnal variations cause elevated levels at night).

Dietary supplements containing biotin may interfere in assays and may skew results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.

Methodology

Immunoassay (IA)

Reference Range(s)

Adult Male
18-29 Years87-1200 pg/mL
30-39 Years70-780 pg/mL
40-49 Years60-700 pg/mL
50-68 Years87-345 pg/mL
Adult Female
18-29 Years60-640 pg/mL
30-39 Years60-650 pg/mL
40-49 Years50-465 pg/mL
>49 YearsNot established
Pediatric Male
5-9 Years574-1849 pg/mL
10-13 Years519-2415 pg/mL
14-17 Years435-2924 pg/mL
Pediatric Female
5-9 Years574-1849 pg/mL
10-13 Years519-2415 pg/mL
14-17 Years242-1291 pg/mL
Service Area must be determined

Preferred Specimen(s)

1 mL serum

Minimum Volume

0.5 mL

Collection Instructions

Allow blood to clot (30-60 minutes) at room temperature. Centrifuge and separate the serum from the cells and transfer serum to a clean transport tube. Freeze as soon as possible.

Transport Container

Transport tube

Transport Temperature

Frozen

Specimen Stability

  • Room temperature: 16 hours
  • Refrigerated: 72 hours
  • Frozen: 90 days

Reject Criteria

Moderate to gross hemolysis • Grossly lipemic • Gross icteric

Setup Schedule

Service Area must be determined
1 mL serum
0.5 mL
Allow blood to clot (30-60 minutes) at room temperature. Centrifuge and separate the serum from the cells and transfer serum to a clean transport tube. Freeze as soon as possible.
Transport tube
Frozen
Room temperature: 16 hours
Refrigerated: 72 hours
Frozen: 90 days
Moderate to gross hemolysis • Grossly lipemic • Gross icteric
Service Area must be determined
Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano. Please provide SERVICE AREA INFORMATION to find available tests you can order.
In-home collection is not available in your area through Quest Mobile.
Test Details

Clinical Significance

Test Resources

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.

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