The barium enema is a good initial screening test for Hirschsprung's disease in severely constipated children since it correlates well with manometry and biopsy. The enema is particularly useful in centers without easy access to pediatric gastroenterology services, and a normal enema in this setting allows the continuation of medical therapy with further evaluation only if there is a lack of response. An abnormal enema, however, requires referral to a facility equipped to perform confirmatory manometry or biopsy.
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