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FREE T4 THYROXINE
MessagePLEASE NOTE: SAMPLE TYPE CHANGE as of 10/23/2018
Gold SST or LG-RED (serum) preferred.
Mint Green (plasma) also acceptable for Free T4 (other thyroid tests require GOLD-SST).
Test Code
FT4
CPT Codes
84439
Preferred Specimen
PLASMA
Other Acceptable Specimens
SERUM
Transport Container
MINT
Transport Temperature
REF-2 DAYS
Setup Schedule
Set Up:
Report Available:
Report Available:
Reference Range
FREE T4 THYROXINE | ng/dL | 0Y 00M F 0.55-1.92 0Y 00M M 0.55-1.92 18 F 0.61-1.12 18 M 0.61-1.12 |
Clinical Significance
T4 circulates in the blood as equilibrium mixtures of free and protein-bound hormones. Changes in concentration or affinity of TBG or other transport proteins profoundly affect the total hormone concentration in serum. The free hormone is independent of these binding protein variations and remains almost constant
This test can be used to diagnose hyperthyroidism or hypothyroidism.
This test can be used to diagnose hyperthyroidism or hypothyroidism.
Performing Laboratory
LMH - Chemistry x3739 or 3764