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T3 Uptake
Test CodeTU
Preferred Specimen
Serum, 0.1 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
T3 Uptake is an indirect indicator of the thyroid status. T uptake and total T4 are used to estimate the amount of circulating free T4.