free thyroxine ( ft4 ) values determined by direct radio-immunoassay and the free thyroxine index ( fti ) determined by indirect calculation were compared in 431 consecutive sera from patients with suspected thyroid dysfunction . sensitivity and specificity were similar for both tests in the thyrotoxic , hypothyroid and euthyroid ranges with appropriate thyroid-binding globulin ( tbg ) concentrations .
C0020676
hypothyroid
C0040132
thyroid