ARUP's Laboratory Test Directory

Thyroglobulin, Fine Needle Aspiration (FNA) : 0020753

Mnemonic: THYROG FNA

Ordering Recommendation: Use with FNA biopsy of thyroid nodules to diagnose benign or malignant non-medullary thyroid nodules.
Methodology: Quantitative Chemiluminescent Immunoassay
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect: Fine needle aspiration in saline. Also acceptable: Non-viscous body fluids.

Specimen Preparation: Centrifuge to remove cellular material. Specimen must be non-viscous and free of particulate matter. Transport 0.5 mL saline needle rinse. (Min: 0.5 mL) Also acceptable: Heparinized specimens.

Storage/Transport Temperature: Frozen.

Remarks: Indicate source on test request form.

Unacceptable Conditions: Breast milk and salivary fluid. Specimens containing EDTA. Viscous specimens.

Stability (collection to initiation of testing): Ambient: 8 hours; Refrigerated: 48 hours; Frozen: 6 months
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).

See Compliance Statement B: www.aruplab.com/CS
CPT Code(s): 84432
Cross References: Fine Needle Aspiration (FNA), Thyroglobulin (Thyroglobulin, Fine Needle Aspiration (FNA))