title: Stool composition in factitial diarrhea: a 6-year experience with stool analysis.
abstract: OBJECTIVE
  To evaluate the utility of stool water analysis in the management of patients with chronic diarrhea.
  
  
  METHODS
  Retrospective analysis of 6 years of experience.
  
  
  METHODS
  A specialized laboratory in a major referral center.
  
  
  METHODS
  325 patients with diarrhea who were referred for stool chemistry analysis. Fecal analysis was requested by many internists and gastroenterologists. Patient records were reviewed to establish the final and most likely cause of diarrhea.
  
  
  RESULTS
  One third of patients provided samples that were inappropriate for analysis, but data from 202 persons were available. The usefulness of the general separation of cases of chronic diarrhea into those in which patients had predominantly osmotic pathophysiologies and those in which patients had predominantly secretory pathophysiologies was confirmed, but overlap and intra-individual variability limited the usefulness of this approach in individual patients. Thirty-five patients (17%) had a diagnosis of factitial diarrhea (30 because of laxative use and 5 because of fluid added to stools).
  
  
  CONCLUSIONS
  Among selected subpopulations, the chemical analysis of fresh stools has a role in the evaluation of obscure examples of chronic diarrhea. It is especially useful in identifying factitial diarrhea.
authors.affiliation: Mayo Clinic, Rochester, Minnesota, USA.
authors.forename: S
authors.initials: S
authors.lastname: Phillips
authors.forename: L
authors.initials: L
authors.lastname: Donaldson
authors.forename: K
authors.initials: K
authors.lastname: Geisler
authors.forename: A
authors.initials: A
authors.lastname: Pera
authors.forename: R
authors.initials: R
authors.lastname: Kochar
mesh_terms: D000293:Adolescent; D000328:Adult; D001834:Body Water / Q000737:chemistry; D002400:Cathartics; D002446:Celiac Disease / Q000150:complications / Q000175:diagnosis; D003092:Colitis / Q000150:complications / Q000175:diagnosis; D003967:Diarrhea / Q000209:etiology* / Q000503:physiopathology; D005243:Feces / Q000737:chemistry*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D019966:Substance-Related Disorders / Q000150:complications / Q000175:diagnosis
chemical_list: D002400:Cathartics