Background: Children with autism spectrum disorder (ASD) have a high prevalence of bladder bowel dysfunction (BBD), with symptoms including urinary incontinence, dribbling, voiding postponement, constipation, and encopresis. BBD is, however, underdiagnosed and has been studied prospectively in few studies. Methodology: All children, aged 2–14 years, diagnosed with ASD using the Childhood Autism Rating Score (CARS), were reviewed in the outpatient department and objectively evaluated for lower urinary tract symptoms using the dysfunctional voiding and incontinence symptoms score, and presence of constipation using the Rome IV criteria. The presence of voiding dysfunction and/or constipation was correlated with the severity of ASD. All children with BBD were advised standard urotherapy and followed up for improvement over the next 3 months. Adherence to the prescribed urotherapy was assessed using the Brief Adherence Rating Scale (BARS) adapted for children with ASD. Results: Of 54 children included, 40 (70.1%) were boys. The mean ± standard deviation of age was 7.5 ± 2.5 years. ASD was mild to moderate in 24 children and severe in 30 children. Nineteen (35.2%) patients had constipation, including four with mild-to-moderate ASD and 15 with severe ASD. Seventeen (31.5%) patients had voiding dysfunction, including nine who could not be toilet trained, and 12 of these patients had moderate-to-severe ASD. Ten (18.5%) patients had both constipation and voiding dysfunction. The presence of voiding dysfunction and/or constipation correlated with the severity of ASD (correlation coefficient 0.55). Adherence to urotherapy correlated inversely with CARS. Children with BARS score >70 showed improvement in constipation and/or voiding dysfunction. Conclusions: Children with ASD have a high prevalence of BBD, and the presence of BBD correlates strongly with the severity of ASD. Children with ASD should be evaluated for BBD and managed appropriately to prevent associated morbidity.
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