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A solid phase radioimmunoassay for free triiodothyroninein serum was developed based on double-antibody coated tubes.The method was turned out to be reliable with good reproducibility,higher sensitivity and easy performance.The measurable range of FT3 in serum was 1.2 to 38pmol/L.The mean coefficients of variationwithin and between assays were 1.79%～3.18% and 4.72%～9.31%,respectively.The FT3 concentrations in euthyroid serum as determined by this methodwere 2.8 to 7.8pmol/L.The FT3 values determined by this new methodcorrelated well with those measured by a commercial radioimmunoassay(r=0.853).