Thyroglobulin, FNA




Test Mnemonic

FTHYG

CPT Codes

  • 84432 - QTY (1)

LOINC ®

53922-1

Aliases

  • Fine Needle Aspiration (FNA)

Performing Laboratory

ARUP


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.5 mLAspirate, fine needle in salineClean container FrozenCentrifuge to remove cellular material. Specimen must be non-viscous and free of particulate matter. Transport 0.5 mL saline needle rinse.

Alternate Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.5 mLAspirate, fine needleSodium or Lithium heparin (Green) FrozenCentrifuge to remove cellular material. Specimen must be non-viscous and free of particulate matter.

Minimum Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.5 mL     

Stability

Environmental Condition Description
Ambient8 hours
Refrigerated48 hours
Frozen6 months

Days Performed

Sun - Sat

Turnaround Time

2 - 3 days

Methodology

Name Description
Chemiluminescence Immunoassay (CLIA) 

Special Info

Use with FNA biopsy of thyroid nodules to diagnose benign or malignant non-medullary thyroid nodules. Unacceptable conditions: Specimen types other than those listed. Specimens containing EDTA. Viscous specimens. Indicate source on test request form. This test is New York DOH approved.

Clinical Info

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. Normal values are less than 10 ng/mL (Baloch ZW et al., CytoJournal 2008, 5:1).