Abstract:Objective To explore the application value of capsule endoscopy for gastrointestinal diseases in children. Methods Clinical data of children who underwent capsule endoscopy at the Department of Gastroenterology, Capital Center For Children''s Health, Capital Medical University from January 2021 to December 2023 were retrospectively analyzed. Lesion detection rates, capsule placement methods, and capsule transit times through different segments of the digestive tract were analyzed. Results A total of 490 children were included, with the age of 10.75 (7.94, 12.83) years. The youngest age was 1 year and 3 months, and the lowest body weight was 8.5 kg. Among them, 128 (26.1%) swallowed capsule endoscope independently, while 362 (73.9%) required endoscopic delivery of the capsule to the duodenum. Total small-bowel transit was completed in 478 cases (97.6%). The small-bowel transit time was 368.5 (253.3, 493.8) minutes. Capsule retention occurred in 2 cases (0.4%). The overall lesion detection rate of children''s digestive system diseases was 33.5% (164/490). The detection rate of lesions in the group under 7 years of age was higher than in those aged 7 years or older [42.1% (40/95) VS 31.4% (124/395), χ2=3.947, P=0.047]. Conclusion Capsule endoscopy offers a meaningful lesion detection rate in pediatric gastrointestinal evaluation, with a high rate of complete small-bowel examination and a low capsule retention rate, supporting its clinical utility. Lesion detection is higher in children under 7 years of age compared with older children. Endoscopic placement of the capsule into the duodenum effectively overcomes swallowing difficulties in young children, thereby expanding the applicability of this examination.