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HelpTest Code LAB127 Thyroxine (T4), Free
Department
CHEMISTRY
Primary Collection Container
Gold (SST)
Alternate Collection Container
Yellow Microtainer SST
Transport
Refrigerated
Preferred Transport Temperature
Refrigerated
Processing
Centrifuge and refrigerate.
Separate from cells if testing is delayed more than 8 hours.
Stability
Ambient: 5 days
Refrigerated: 7 days
Frozen: 30 days
Minimum Testing Volume
0.5 mL
Reference Range
0.8-1.8 ng/dL
Methodology
Roche e801 Electrochemiluminescence Immunoassay; Competition principle
Performed
Sunday – Saturday
Reported
As completed
CPT Codes
84439
Unacceptable Conditions
Gross hemolysis.
Plasma specimens.