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Thyroglobulin, Fine Needle Aspiration (FNA)
Ordering Recommendation
Use with FNA biopsy of thyroid nodules to diagnose benign or malignant nonmedullary thyroid nodules.
New York DOH Approval Status
Specimen Required
Fine needle aspiration in saline.
Centrifuge to remove cellular material. Specimen must be non-viscous and free of particulate matter. Transfer 0.5 mL saline needle rinse to an ARUP Standard Transport Tube. (Min: 0.5 mL) Also acceptable: Heparinized specimens.
Frozen.
Specimen types other than those listed. Specimens containing EDTA. Viscous specimens.
Indicate source on test request form.
Ambient: 8 hours; Refrigerated: 1 week; Frozen: 6 months
Methodology
Quantitative Chemiluminescent Immunoassay
Performed
Sun-Sat
Reported
Within 24 hours
Reference Interval
By report
Interpretive Data
Thyroglobulin (Tg) is measured by the Beckman Coulter Access method. Results obtained with different assay methods or kits cannot be used interchangeably. The Tg result, regardless of concentration, should not be interpreted as absolute evidence for the presence or absence of papillary or follicular thyroid cancer. This test is FDA cleared but is not labeled for use with FNA fluid.
The performance characteristics of this test were determined by ARUP.
Normal values are less than 10 ng/mL (Baloch ZW et al., CytoJournal 2008, 5:1).
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA-certified laboratory and is intended for clinical purposes.
Laboratory Developed Test (LDT)
Note
Hotline History
CPT Codes
84432
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0020754 | Thyroglobulin, Fine Needle Aspiration | 53922-1 |
Aliases
- FNA TG
