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Geisinger Medical Laboratories Test Catalog
THYROGLOBULIN, FINE NEEDLE ASPIRATE |
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ORDERING INFORMATION: |
Geisinger Epic Procedure Code: LAB1024 Geisinger Epic ID: 52021 | |
SPECIMEN COLLECTION |
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Specimen type: |
Preferred: FNA of thyroid tissue washings in sterile transport tube. Alternative specimen: Non-lymph node, non-nodal soft tissue, or cervical node washings. | |
Preferred collection container: |
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Specimen required: |
1 mL; minimum 0.8 mL. | |
Special notes: |
A 25-gauge needle is inserted obliquely within the transducer plane of view and moved back and forth (passes) through the nodule to compensate for patient movement and needle deflection. There is no suction device; cells move into the needle via capillary action. After collection of the cytology samples, withdraw between 0.10 and 0.25 mL of saline up through each needle and empty this fluid back through the needle into a tube. This is the needle washing used for analysis. Repeat the passes and saline washings from the same biopsied site and empty contents into the same tube. The washes from all needles are pooled (final volume 1 mL). Inspect specimen for visible blood or tissue contamination. If bloody, centrifuge specimen and transfer supernatant to a new tube to send to the laboratory. The supernatant, not the cellular materials, is used for analysis. If the specimen is clear, centrifugation is not necessary. | |
| SPECIMEN PROCESSING |
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Specimen processing instructions: |
Freeze immediately and transport frozen sample to laboratory directly. Do not send specimens in glass tubes. | |
Transport temperature: |
Frozen. | |
Specimen stability: |
Room temperature: 14 days. Refrigerated: 7 days. Frozen: 28 days. | |
Rejection criteria: |
Specimen in glass tubes unacceptable. | |
TEST DETAILS |
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CPT code(s): |
84432 | |
| Note: The billing party has sole responsibility for CPT coding. Any questions regarding coding should be directed to the payer being billed. The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only. | ||
Methodology: |
Chemiluminescence |
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Synonyms: |
Quest test code 16559, Tg FNA LOINC C, Thyro FNA
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Clinical significance: |
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. | |