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Test Code
TGFNA
Test Name
Thyroglobulin, Fine Needle Aspirate
CPT Codes
84432
Expected Turnaround Time
4 - 7 days
Clinical Utility

Clinically enlarged cervical lymph nodes with a history of thyroid cancer are usually assessed by fine-needle aspiration biopsy (FNAB) followed by a cytology. Thyroglobulin (Tg) is frequently elevated in malignant FNAB needle wash specimens and it's use may possibly augment or replace cytology.
Specimen and Container Info

Preferred Specimen Type: Fine Needle Aspirate

Alternate Specimen Type: Thyroid tissue washing, non-lymph node, non-nodal soft tissue, or cervical node washings

Collection Container: Sterile Container

Desired Specimen Volume: 1 mL
Collection Instructions
  1. Collect fine needle aspirate with a biopsy needle.
Processing and Submission Instructions
  1. Inspect specimen for visible blood or tissue contamination.
  2. If bloody, centrifuge specimen and aliquot 1 mL of supernatant to a sterile aliquot tube (screw cap). 
  3. If the specimen is clear, centrifugation is not necessary.
  4. Freeze immediately.
Transport Instructions

Transport to the laboratory frozen. 
Stability Requirements

Room Temperature

14 days

Refrigerated

7 days

Frozen

28 days
Causes for Rejection
  • Glass Tubes
Methodology
Beckman Coulter Chemiluminescent
Reference Intervals

 See patient report.
Alternate Names
  • Tg FNA 
Reference Lab
Quest Diagnostics Nichols Institute
Testing Schedule
Routine, 3 times per week
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
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