4 Comparing anorectal function tests 95 function tests correlate poorly with DRE and with other anorectal function tests. When conservative treatment fails, further investigation is warranted, however these results should be interpreted with caution. What does this paper add to the literature? Anorectal function tests as the 3D high resolution anorectal manometry, balloon expulsion test, surface electromyography and transperineal ultrasound are all frequently performed in the diagnostic work-up in patients with defecation disorders. No previous study has compared these tests regarding their outcomes, nor has the interrater agreement been measured regarding the digital rectal examination by two experienced observers. Furthermore, transperineal ultrasound is in all probability not frequently used and therefore underexposed in the diagnostic workup of patients with dyssynergic defecation.
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