Efficacy of Short Time Intervals in Split-Dose Bowel Preparation of Oral Sulfate Solution for Colonoscopy

Inclusion Criteria: * Voluntarily participate and sign informed consent; * Subjects who require screening, surveillance, and diagnostic colonoscopy; * Subjects who take the oral sulfate solution for bowel preparation. Exclusion Criteria: * Subjects with serious cardiac and cerebrovascular diseases, bronchial and lung diseases, suffering from metabolic disease or endocrine disease, abnormal blood clotting mechanism, malignant tumor, electrolyte abnormalities, epilepsy, renal or liver dysfunction; * Subjects with ascites, suspected electrolyte abnormalities, or uncorrected dehydration. * Subjects with confirmed or suspected gastrointestinal obstruction, gastric retention, gastroparesis, gastric emptying disorder, or acute gastrointestinal bleeding; * Subjects with confirmed or suspected colorectal cancer, inflammatory bowel disease, toxic colitis, or toxic megacolon. * Subjects who had previously undergone colorectal resection. * Subjects with constipation or suspected severe gastric motility disorder; * Women with positive pregnancy tests or pregnancy plans, and women in lactation; * Subjects who have participated in any other clinical trials within the last 3 months; * Subjects with any other conditions that the investigator considered inappropriate for inclusion.