[Immediate effect of x-ray contrast media on thyroid hormone parameters]

Immediately after application of various contrast media a number of functional parameters of thyroid function were determined. Especially after application of Biliscopin which is strongly bound to plasma proteins, a significant rise of the free thyroid hormone fractions, a significant increase in the binding capacity of specific transport proteins and a decrease of the total concentration of thyroid hormones was noticed. It is therefore recommended that neither in the early phase within the first hour, nor in the late phase within 10 days after application of contrast media, blood for determination of parameters of thyroid function should be collected, since otherwise misleading results may be obtained.