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Geisinger Medical Laboratories Test Catalog
T4, TOTAL |
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ORDERING INFORMATION: |
Geisinger Epic Procedure Code: LAB3129 Geisinger Epic ID: 7016 | |
SPECIMEN COLLECTION |
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Specimen type: |
Plasma or serum | |
Preferred collection container: |
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Specimen required: |
2 mL of serum or plasma; 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: 12 months. | |
Rejection criteria: |
Stability limits exceeded. | |
TEST DETAILS |
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Reference interval: |
Adult T4 = 4.6-12.0 mcg/dL. | |
CPT code(s): |
84436 | |
| 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 thyroxine (T4). | |
Methodology: |
Electrochemiluminescence |
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Synonyms: |
T4, Total; T4(D), TOTT4
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Clinical significance: |
For diagnosis of hypothyroidism and hyperthyroidism. | |
Doctoral Director(s:) |
Hoi-Ying Elsie Yu, PhD, DABCC, FADLM Sheng-Ying (Margaret) Lo, PhD, DABCC |
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| Review Date: | 12/14/2022 | |