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Laboratory Test Detail

Last Updated: April 18, 2024 @ 9:13 am

2003

T4 TOTAL

Specimen:Collect:
  • One SST

Also Acceptable:
  • One Green Top (Li Heparin)
  • One Green Top (Na Heparin)
  • One Lavender (EDTA)
  • One Pink Top (EDTA)
  • One Red Top
Submit:
  • 1 mL (Min:0.5 mL) Serum . Submit Refrigerated. Submit in a Standard Transport Tube.

Also Acceptable:
  • 1 mL (Min:0.5 mL) Plasma . Submit Refrigerated. Submit in a Standard Transport Tube.
Special Handling:
  • Allow specimen to clot completely at room temperature
  • Avoid Repeated Freeze/Thaw Cycles
  • For patients receiving therapy with high biotin doses (>5 mg/day), no laboratory test specimen should be collected until at least 8 hours after the last biotin administration.
  • Minimize air exposure
  • Separate from cells ASAP
Stability:Ambient: 2 Hour(s); Refrigerated: 1 Week(s); Frozen: 1 Month(s); Incubated: Unacceptable
Methodology:
  • Electrochemiluminescence Immunoassay (ECLIA)
Performed:Mon-Fri
Reported:1-3 Day(s)
CPT Codes:
  • 84436
Interpretive Data:General Reference Range : 4.5-11.7 ug/dL

Biotin in specimens taken from patients on high-dose biotin therapy or supplements may intefere with this test and cause inaccurate test results. It is recommended that for patients receiving therapy with high biotin doses (> 5 mg/day), no laboratory test specimen should be collected until at least 8 hours after the last biotin administration.
Components:
  • 2003 - T4 TOTAL
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