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Test Code LAB127 Thyroxine, Free (FT4)

Specimen Requirement

1.0 mL serum or Lithium Heparin; SST and PST acceptable.

 

Avoid prolonged contact with red blood cells.

Specimen Stability

6 days at 2-8° C

6 days at -20° C

Testing Schedule

Daily

Reference Range

0.7 - 1.8 ng/dL

Testing Department

Chemistry

Method

Chemiluminescent Microparticle Immunoassay (CMIA)

CPT Code

84439