At present, there is no data to support how many days the enhanced CT contrast agent is excreted, and it needs to be seen according to the individual’s physique as well as the specific situation. The main contrast agents for enhanced CT are iohexol and iophorol, which will make the enhanced CT examination clearer after entering into the blood circulation, and once in a while the use of them is not a great influence on health. The metabolism speed is mainly related to the kidney function, the better the kidney function, the faster the metabolism. If the patient’s kidney function is not very good or his/her own metabolism is very slow, the time of elimination will be prolonged. In addition, it is recommended that patients who need to do enhanced CT contrast agent go to regular hospitals and do it under the correct operation of doctors. Patients can also speed up the metabolism of contrast agent by drinking more water, eating fresh vegetables and fruits properly, and exercising properly.