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T4
Test CodeLAB126
Alias/See Also
Thyroxine, Total T4
CPT Codes
84436
Preferred Specimen
4.5 ml (1.5 ml minimum) lithium heparin (green); alternate-SST (gold) or Red (no additive)
Minimum Volume
1 ml (500 ul minimum) plasma; alternate-serum
Instructions
After centrifugation, if not in gel barrier tube, pour off serum into an aliquot tube
Transport Temperature
Room Temp.
Specimen Stability
Separated from cells: 8 hours room temp, 48 hours refrigerated
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Icteric: >20 mg/dL bilirubin, Hemolysis: >500 mg/dL hemoglobin, Lipemia: >3000 mg/dL triolein or >500 mg/dL cholesterol
Methodology
Competitive Binding Immunoenzymatic Assay
Setup Schedule
Mon- Sun
Reference Range
4.3-11.7 µg/dL
Clinical Significance
The clinical importance of total T4 determination is in the diagnosis and confirmation of thyroid disorders
Performing Laboratory
Piedmont Athens Regional