This study investigated the changes in serum thyroid function and urinary iodine levels before and after the use of iodinated contrast to analyze the prevalence of thyroid dysfunction in the Chinese euthyroid adults after using iodinated contrast.

This study aims to monitor the thyroid function, urinary iodine level, and other indicators of patients after using iodine contrast agents, in order to analyze the prevalence of thyroid dysfunction after using iodine containing contrast agents, and investigate the impact of different iodine contrast agents on thyroid function, in order to provide evidence for the use of iodine contrast agents in clinical practice and the risk prevention of subsequent thyroid diseases.

Inclusion Criteria:

• patients who use iodinated contrast agent

Exclusion Criteria:

• patients with the following diseases: malignant tumor, critical illness (admitted to ICU), mental disease, hypothalamus-pituitary disease.
• administration of anti-thyroid drugs (methimazole, propylthiouracil), levothyroxine, compound iodine solution, amiodarone, immunostaining point inhibitor, tyrosine kinase inhibitor, interferon, interleukin-6, lithium, glucocorticoids β Receptor blockers, dopamine, dobutamine, bromocriptine, octreotide, phenobarbital, phenytoin sodium, rifampicin, and carbamazepine within the past 6 months

Patients who are identified of having undergone a radiological examination use of an iodinated contrast agent in Sun Yat-sen Memorial Hospital of Sun Yat-sen University