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Vanderbilt Pathology Laboratory Services

Test Directory



FREE THYROXINE, BODY FLUID (BF4)

Department: Chemistry
Test Synonym(s): BF4, Amniotic fluid, fT4
CPT Codes: 84439
Methodology: Immunoenzymatic
Reference Range: Not established
Tube Type: Body fluid tube
Specimen: Amniotic fluid
Alternate Specimen: Body fluid
Pediatric Requirements: 1 mL Body fluid
Volume: 2 mL Body fluid
Minimum Volume: 1 mL Body fluid
Temperature: Refrigerated
Reasons for Rejection: Wrong specimen type
Days Performed: Daily
Times Performed: Continuous
TAT: 1 day
Significance: Measurement of fT4 in amniotic fluid may be useful for monitoring fetal goiter.
Special Instructions: This test requires approval from a medical director. The performance characteristics of the Beckman Coulter fT4 assay have not been validated in Amniotic or other body fluid. This test is FDA approved in serum, but not for use in body fluid.


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