T4, Free
| Abbrev Code: | FT4 | ||
| Order Code: | LAB127 | Order Name: | T4 Free |
| Synonyms: | Free T4 (Thyroxine); FT4 | ||
| Methodology: | Roche: Electrochemiluminescence immunoassay (ECLIA)
Vista: Chemiluminescence |
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| CPT Codes: | 84439 x1, 84439 x1 | ||
| Turnaround Time: | Varies by site. | ||
| Associated Links: | |||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 2.5 mL |
| Minimum\Peds Volume: | 0.6 mL |
| Collection Instructions: | Chemistry Tests Containers Chart |
| Causes for Rejection: | Gross hemolysis |
| Contraindications: | Large doses of biotin (10 mg or more per day) may cause clinically significant interference in free T4 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: | Centrifuge and aliquot 1.25 mL, 0.2 mL minimum. Store in refrigerator. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | Roche: 5 days at room temperature; 7 days refrigerated; 30 days frozen. Freeze only once.
Vista: 24 hours at room temperature; 14 days refrigerated; 3 months frozen. |
| Test Performed at or Referral Lab | Chemistry (CSC Maple Grove, Roche-Grand Itasca, Roche-Lakes, Roche-Northland, Roche-Range, Roche-Ridges, Roche-Southdale, Roche-St. John's, Roche-UMMC East, Roche-UMMC West) |
Interpretive
| Reference Range: |
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