| Test Name: | T3, Total (Triiodothyronine) |
| Epic Order Code: | LAB137 |
| CPT Code: | 84480 | | |
| Specimen(s) Type: | Plasma or Serum; 0.5 mL |
| Acceptable Container(s): |   Tube tops are light green and gold. |
| Testing Schedule: | 24 hrs/day, 7 days/week |
| Turn Around Time: | STAT: 1 hour | | |
| | Routine: 2 hours |
| Collection Information: | No special patient preparation is required. Obtain specimen by standard collection procedures. |
| Transport Information: | Deliver to lab immediately. All specimens must be signed into the laboratory. |
| Reference Clients: | If unable to deliver to the lab within 1 hour, centrifuge the specimen and remove plasma/serum from the red cells. Store and transport at 2-8° C. Specimen must be received in the lab within 24 hours. |
| Causes for Rejection: | Improperly labeled, incorrect container, contaminated, insufficient quantity, incorrect/delay in transport. |
| Reference Range: | 0 - 4 days: 0.96 - 2.92 ng/mL |
| | 4 - 60 days: 0.62 - 2.43 ng/mL |
| | 2 mo - 2 yrs: 0.81 - 2.81 ng/mL |
| | 2 - 7 yrs: 0.83 - 2.52 ng/mL |
| | 7 - 12 yrs: 0.92 - 2.19 ng/mL |
| | 12 - 19 yrs: 0.83 - 2.15 ng/mL |
| | > 19 yrs: 0.80 - 2.00 ng/mL |
| Additional Information: | Therapy with amiodarone can lead to depressed T3 values. |
| | Phenytoin, phenylbutazone, and salicylates cause release of T3 from the binding proteins, thus leading to a reduction in the total T3 hormone level at normal free T3 levels. |