T3 Free
| Abbrev Code: | FT3 | ||
| Order Code: | LAB137 | Order Name: | T3 Free |
| Synonyms: | Free T3; Triiodothyronine; FT3; Thyroid; TFT | ||
| Methodology: | Electrochemiluminescence immunoassay (ECLIA) | ||
| CPT Codes: | 84481 x1, 84481 x1 | ||
| Turnaround Time: | Performed and reported 24 hours/day. | ||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 2.5 mL |
| Minimum\Peds Volume: | 0.6 mL |
| Container: | Green (lithium heparin, gel) Alternate Containers: Green (lithium heparin, no gel), Green (lithium heparin, gel) on ICE, Red (no gel), Red or gold (gel) |
| Causes for Rejection: | Grossly hemolyzed. |
| Contraindications: | Large doses of biotin (10 mg or more per day) may cause clinically significant interference in free T3 levels. If interference is suspected, it is strongly recommended that biotin is discontinued for at least one week prior to retesting. |
Processing and Shipping
| Specimen Processing: | Separate serum or plasma from cells ASAP. Centrifuge and aliquot 1.25 mL, 0.2 mL minimum. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | 5 days at room temperature; 7 days refrigerated; 30 days frozen. Freeze only once. |
| Test Performed at or Referral Lab | Chemistry (Roche-UMMC East) |
Interpretive
| Reference Range: |
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