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Geisinger Medical Laboratories Test Catalog
T3, TOTAL |
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ORDERING INFORMATION: |
Geisinger Epic Procedure Code: LAB3126 Geisinger Epic ID: 21990 | |
SPECIMEN COLLECTION |
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Specimen type: |
Plasma or serum | |
Preferred collection container: |
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Specimen required: |
1 mL aliquot of plasma or serum; minimum 0.5 mL. | |
| SPECIMEN PROCESSING |
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Specimen processing instructions: |
Allow serum to clot. Centrifuge to separate serum or plasma within 2 hours of collection. | |
Transport temperature: |
Refrigerated (preferred) or frozen. | |
Specimen stability: |
Refrigerated: 7 days. Frozen: 1 month. | |
Rejection criteria: |
Stability limits exceeded. | |
TEST DETAILS |
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Reference interval: |
Total T3 = 80-200 ng/dL. | |
CPT code(s): |
84480 | |
| 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. | ||
Test includes: |
Total T3. | |
Methodology: |
Electrochemiluminescence |
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Synonyms: |
TOTT3G, Total Triiodothyronine
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Clinical significance: |
Total T3 measurements are used to diagnose and monitor treatment of hyperthyroidism and are essential for recognizing T3 toxicosis. | |
Doctoral Director(s:) |
Hoi-Ying Elsie Yu, PhD, DABCC Sheng-Ying (Margaret) Lo, PhD, DABCC |
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| Review Date: | 12/14/2022 | |