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T3 Total
Test Code859
CPT Codes
84480
Preferred Specimen
1 mL serum collected in a serum separator tube (SST)
Minimum Volume
0.3 mL
Transport Container
Plastic screw-cap vial
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Methodology
Immunoassay (IA)
Setup Schedule
Set up: Daily; Report available: Next day
Reference Range
<1 Month | Not established | |
1-23 Months | 117-239 ng/dL | |
2-12 Years | 105-207 ng/dL | |
13-20 Years | 86-192 ng/dL | |
>20 Years | 76-181 ng/dL |
Clinical Significance
Total T3 measurements are used to diagnose and monitor treatment of hyperthyroidism and are essential for recognizing T3 toxicosis.