[The effect of contrast media containing iodine on selected in vitro thyroid test procedures (author's transl)].

The effect of 6 commonly used contrast media on the results of 3 different methods for determination of thyroid hormone concentration in the serum is examined in vivo. T4 determination by column chromatography proved to be very liable to distortion for contrast media. With some contrast media the Res-O-Mat-ETR test proved unreliable. T4 determination by means of protein binding analysis is not affected by contrast media in the direction of false raised values.