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| 40050:THYROXINE (T4), FREE | |||||||||
| Alias Names: | FT4 , FREE T4 | ||||||||
| Methodology: | Chemiluminescent Immunoassay (CLIA) | ||||||||
| Edit Date: | 6/11/2010 | ||||||||
| Performed: | Daily | ||||||||
| Released: | Same day as tested | ||||||||
| CPT Code: | 84439 | ||||||||
| Specimen Collection Details | |||||||||
| Collection: | One 7.5 mL serum separator tube (SST). Also acceptable: One 4.5 mL light green top plasma separator tube (PST) or one 4 mL green top tube (heparin). | ||||||||
| Handling: | Centrifuge SST or PST and transport in original tube. Heparin must be centrifuged and the plasma separated into a plastic vial for transport. Refrigerate. Freeze if specimen cannot be assayed within 7 days. Allow no more than one freeze/thaw cycle. | ||||||||
| Stability: | 8 hours ambient, 7 days refrigerated, or 1 month frozen. | ||||||||
| Standard Volume: | 0.5 mL serum or plasma. | ||||||||
| Minimum Volume: | 250 µL serum or plasma. | ||||||||
| Transport: | Refrigerated, or frozen on dry ice. | ||||||||
| Rejection Criteria: | Specimen frozen/thawed more than once. | ||||||||
| Reference Range: | |||||||||||||||||||
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Male/Female – 11 months-adult
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0.61-1.27 ng/dL
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| No reference range established for infants less than 12 monts old. | |||||||||||||||||||