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Diagnostic disagreement between tests of evacuatory function: a prospective study of 100 constipated patients

Evacuatory dysfunction (ED) is a common cause of constipation and may be sub‐classified on the basis of specialist tests. Such tests may guide treatment e.g., biofeedback therapy for ‘functional’ defecatory disorders (FDD). However, there is no gold standard, and prior studies have not prospectively and systematically compared all tests that are used to diagnose forms of ED.