Painless colonoscopies are generally unaffected by blood tests and can be performed as needed. Painless colonoscopy refers to the administration of intravenous anesthetic drugs on top of the normal colonoscopy, and these drugs have no effect on blood tests. It mainly serves to anesthetize the nerves and has no effect on the blood components. Before painless colonoscopy generally need to draw blood to check the virus series, blood routine, liver function and other items, used to determine whether it is feasible to colonoscopy. Painless colonoscopy can clarify whether the intestinal mucosa has lesions and the nature of the lesions, but also can carry out biopsy of the local mucosa and treatment, which is currently an important examination for the diagnosis and treatment of intestinal diseases. For whether other tests can be performed after painless colonoscopy, it is recommended to further combine with the doctor’s opinion.