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While most patients will respond to lifestyle and dietary changes and conventional therapy, some may require diagnostic studies.<\/jats:p><\/jats:sec><jats:sec><jats:title>Aim<\/jats:title><jats:p>To review the diagnostics studies used to evaluate children with functional constipation.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>There is no evidence to support the routine use of abdominal X\u2010rays in the evaluation of paediatric constipation. Colon transit by radiopaque markers (ROM) should be indicated when medical history does not match clinical findings, to guide colon manometry (CM) performance and to discriminate between faecal incontinence from functional constipation and non\u2010retentive faecal incontinence. Colon scintigraphy may be useful as an alternative to ROM. Lumbar spine MRI may be indicated to evaluate for spinal abnormalities. The role of defecography has not been properly evaluated in children. Anorectal manometry in children is indicated primarily to evaluate anal resting pressure, presence and quality of the recto\u2010anal inhibitory reflex and simulated defecation manoeuvres. The CM is indicated to guide surgical interventions after failing medical therapy.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The goal of these studies is to identify treatable causes of constipation. Most of these studies are designed to evaluate anatomy, transit and\/or colon\/rectum motility function and are primarily indicated in those who fail to respond to conventional therapy.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apt.17857","type":"journal-article","created":{"date-parts":[[2024,6,28]],"date-time":"2024-06-28T09:48:28Z","timestamp":1719568108000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Testing in functional constipation\u2014What's new and what works"],"prefix":"10.1111","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7128-6048","authenticated-orcid":false,"given":"Leonel","family":"Rodriguez","sequence":"first","affiliation":[{"name":"Section of Pediatric Gastroenterology, Hepatology and Nutrition, Yale New Haven Children's Hospital Yale University School of Medicine  New Haven Connecticut 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