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Keywords/Mnemonics: FT4,T4 FREE, Free T4, thyroid
1 light green top plasma gel tube or 1 gold top serum gel tube. Send 1.0 mL (minimum volume 0.5 mL) serum or plasma refrigerated.
0.8 - 1.5 ng/dL
Thyroid autoantibodies in human serum may interfere and cause falsely elevated FT4 results.
Specimen not refrigerated.
View test details, including specimen collection, patient preparation & reference ranges.
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