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Test Code T4 T4

Aliases

Total T4, Thyroxine

Patient Preparation

No special patient preparation required

Collection Method

Venous collection

Minimum Volume

  • Adults: 0.8 mL
  • Pediatric: 0.6 mL

Container

Lt Green / Plasma Separator / Lithium Heparin

Preferred Specimen

Light Green Top (lithium heparin) plasma

Acceptable Specimens

Serum:

  • Gold Top SST
  •  
  • Red Top


Plasma:

 

  • Light Geen Top (lithium heparin)
  • Purple Top (K2 EDTA)
  • Dark Green Top (sodium heparin)

 

Reference or Target Ranges

4.5 – 11.7 ug/dL

Reportable Units

ug/dL

Critical Value

Not defined for this assay

Reasons for Rejection

 


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Hemolysis Threshold 2300 mg/dL
Icterus Threshold 37 mg/dL
Lipemia Threshold 2500 mg/dL
Other QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability

 


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Ambient 8 hours
Refrigerated (4°C to 8°C) 7 days
Frozen(-40°C to 0°C) 30 days

Performance Information

 


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Days and Time Performed 24/7
Expected Turn Around Time Routine: 4 hours
Stat Availability No
Performing Bench UH Chemistry
Methodology/Method Description Roche Cobas – Competition principle

CPT Codes

84436