Test Overview

Test Methodology

ELISA

Test Usage

This test is used for monitoring effectiveness of antiresorptive therapy in patients treated for osteoporosis or other metabolic bone disorders or as an adjunct in the diagnosis of medical conditions associated with increased bone turnover.

Reference Range*

All units are reported in nmol Bone Collagen Equivalents (BCE). Adult Male: 5.4-24.2 nmol BCE; Adult Female, Premenopausal: 6.2-19.0 nmol BCE.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

Some patients who have been exposed to animal antigens, either in the environment or as part of treatment or imaging procedures, may have circulating antianimal antibodies present. These antibodies may interfere with the assay reagents to produce unreliable results.

Test Details

Days Test Performed

Tuesday, Thursday

Analytic Time

2 - 6 days

Soft Order Code

FNTX

MiChart Code

NTx Serum (Sendout)

Synonyms

Synonyms

N-Telopeptides, Serum
Pyrrolinks-D, Serum
Crosslinked N-telopeptide of Type 1 Collagen, Serum
Type I Collagen (NTX), Serum
Collagen Crosslinks, Serum
FNTX
N-Telopeptide, Cross-Linked, Serum

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Laboratory

Sendout

Laboratory Reference

Mayo SNTX

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Specimen Requirements

Offsite Collection Instructions

Collect specimen in a red top or SST tube from a fasting patient (preferred). Centrifuge, aliquot serum into a plastic vial and freeze.

Contraindication

This test should not be used for the screening or diagnosis of osteoporosis. In patients with other clinical conditions known to affect bone resorption (eg; cancer metastases to bone), interpretation of serum NTx for monitoring response to osteoporosis therapy might be unreliable.

Fasting Specimen

A morning collection from fasting patients is preferred. If not possible, collect the baseline and subsequent specimens under the same circumstances (e.g., at same time of day).

Container

Yellow Top Tube

Normal Volume

0.5 mL serum

Minimum Volume

0.1 mL serum

Additional Information

Test sent to Mayo Medical Laboratories.

Billing Information

Fee Codes


CPT Code

82523

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