Fine-Needle Aspiration Biopsy Needle Wash; Fluid
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Thyroglobulin, FNA Wash
Test ID: THYROG FL
Test
Method
Immunoassay
Platform
Roche
Specimens
Clinical Utility
Thyroglobulin (Tg) is a glycoprotein exclusively produced by the follicular cells of the thyroid; therefore, detection of Tg in athyrotic individuals facilitates detection of persistence, recurrence, or metastasis of thyroid carcinoma.
Most metastases of papillary thyroid cancer occur in the lymph nodes in the neck. Suspicious nodes undergo fine needle aspiration (FNA) cytological examination to determine diagnosis. However, 1 out of every 5 samples has inadequate cellularity, necessitating Tg testing in FNA-needle wash.
Test Version
27-Jan-2026
Specimen
Specimens
Fine-Needle Aspiration Biopsy Needle Wash; Fluid
Collection Containers
Sterile Container
Sample Volume
1.0 mL
Collection & Handling
Collection Instructions
Refer to Fine Needle Aspirate Biopsy Collection Instructions.
Provide source of fluid. Saline is the only acceptable fluid to wash the needle.
Handling Information
Centrifuge if necessary to remove blood and/or cellular material. Freeze within 8 hours of collection. Store and send frozen.
Stability
| Ambient | 8 hours |
|---|---|
| Refrigerated | 8 hours |
| Frozen | 90 days |
Test Version
27-Jan-2026
Performance / Interpretation
Method
Immunoassay
Platform
Roche
Results
| Name | Units | Reference Range | Conversion Factor | |
|---|---|---|---|---|
| Thyroglobulin | µg/L |
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The lab has not established reference intervals for thyroglobulin on other fluid types.
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Test Version
27-Jan-2026
Interface / Setup
HL7 Interface Codes
| Order Code | Result Codes | Units |
|---|---|---|
| THYROG FL | 62129Thyroglobulin, Fluid | ug/L |
Test Version
27-Jan-2026