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Introduction Internal rectal prolapse is an irritating gastrointestinal disease and one of the causes of obstructive constipation in children under 15 years of age. This study aimed to introduce a new method and grading for diagnosing internal rectal prolapse in children. This study is based on the experience of the last ten years, which was re-evaluated as research using a control group. Method This is a prospective cross-sectional study. The results of the Delshad-Mash test were analyzed in 60 patients with internal rectal prolapse referred to (XXX) from January 2019 to June 2021. Another 60 children referred for non-digestive surgeries such as hernia and hypospadias with parental consent Were selected as a control group. The sensitivity of the Mesh Delshad test in diagnosing and measuring the degree of internal prolapse of the rectum was analyzed by placing the data in STATA software, version II. P < 0.05 was considered to show statistical significance. Results This study included 120 patients (52 girls and 68 boys) with a body age of 6 months–15 years and a mean age of 45 ± 4.7 years. The study group consisted of 60 patients with symptoms of internal rectal prolapse and 60 patients without the symptoms described in the file. The ROC curve was used to evaluate the accuracy of the test. The ROC curve showed that the sensitivity and specificity for the mesh test as a diagnostic indicator are 89.71% and 92.31%, respectively. The thickness of the folded (prolapsed) mucosa was measured and divided into four degrees according to the rectum’s internal prolapse. Conclusion According to the results and experiences obtained from this study, the Delshad Mesh method is beneficial for diagnosing internal rectal prolapse that has positive clinical symptoms. Highlights