ARUP's Laboratory Test Directory
| 0070140: Thyroxine |
| Test Mnemonic: T4 | |
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#ExistMethodology>
Methodology: Electrochemiluminescent Immunoassay
*ExistMethodology> #ExistPerformed> Performed: Sun-Sat *ExistPerformed> #ExistReported> Reported: Within 24 hours *ExistReported> |
| Specimen Required: | |
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#ExistCollect>
Collect: One 4 mL SST or PST. Also acceptable: One 3 mL lavender (EDTA).
*ExistCollect> #ExistTransport> Transport: 1 mL serum or plasma at 2-8°C. (Min: 0.5 mL) Submit specimen in an ARUP Standard Transport Tube. *ExistTransport> #ExistPedCollectTransport> Pediatric Collection/Transport: 0.2 mL serum or plasma at 2-8°C. *ExistPedCollectTransport> #ExistRemarks> Remarks: Allow serum to clot completely at room temperature. Separate serum or plasma from cells ASAP. *ExistRemarks> #ExistConditions> Unacceptable Conditions: Grossly hemolyzed specimens. *ExistConditions> #ExistStability> Stability: After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 month *ExistStability> |
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| Reference Interval: |
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#ExistRefRange> Cord blood: 6.6-17.5 µg/dL 5-9 years: 6.4-13.3 µg/dL 1-7 days: 11.0-21.5 µg/dL 10-14 years: 5.6-11.7 µg/dL 8-30 days: 8.2-16.6 µg/dL 15-20 years: 4.2-11.8 µg/dL 1 month-4 years: 7.2-15.6 µg/dL 21 years and older: 5.1-14.1 µg/dL *ExistRefRange> |
| CPT Code(s): | |
| 84436 |