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T3, Free
Test CodeFT3
Preferred Specimen
Serum, 0.2 mL minimum
Transport Container
SST tube
Transport Temperature
Specimen stable for 8 hours at room temp., 2 days refrigerated and >2 days frozen
Reference Range
See report for normal ranges
Clinical Significance
Free T3 levels correlate with T3 secretion and metabolism. In hypothyroidism and hyperthyroidism free T3 levels parallel changes in total T3 levels.