Sources and References

Full reference list for bristolstoolchart.com - Updated September 2026

This site is written to be consistent with NHS and NICE guidance and with peer-reviewed gastroenterology literature. We update content when relevant guidelines are revised. Primary sources are prioritised throughout. Where consumer-facing NHS pages summarise clinical guidance, we link to the underlying clinical guideline where possible.

Primary Source

Lewis SJ, Heaton KW (1997). Stool Form Scale as a Useful Guide to Intestinal Transit Time. Scandinavian Journal of Gastroenterology, 32(9):920-924. DOI: 10.3109/00365529709011203. [The original 1997 paper that established the Bristol Stool Form Scale and its correlation with colonic transit time.]

NHS and NICE Guidelines

NHS England (2023). Bristol Stool Chart for Carers [web version]. NHS England. Available at: england.nhs.uk [Published July 2023 as part of NHS England's constipation campaign for people with a learning disability and their carers. Its instruction reads: if a poo does not look like type 3 or type 4 it could be constipation.]
NICE (2008, updated 2017, reviewed April 2025). Irritable bowel syndrome in adults: diagnosis and management. NICE guideline CG61. National Institute for Health and Care Excellence. [Covers IBS diagnosis, Bristol scale use, low-FODMAP, and treatment pathway. Recommendation 1.2.1.6 addresses probiotics without naming a strain; 1.2.3.1 gates psychological interventions to refractory IBS.]
Schmulson MJ, Drossman DA (2017). What Is New in Rome IV. J Neurogastroenterol Motil, 23(2):151-163. [Source for the Rome III to Rome IV change in the IBS subtype denominator: percentages are taken over days with abnormal bowel movements rather than over all bowel movements.]
NICE (2019). Ulcerative colitis: management. NICE guideline NG130. [Reproduces the Truelove and Witts severity index: severe disease is 6 or more bowel movements a day with blood plus at least one feature of systemic upset.]
NICE Clinical Knowledge Summaries. Irritable bowel syndrome: how common is it? Last revised July 2025. cks.nice.org.uk [Source for the 5-20% general-population prevalence estimate and the Rome IV versus Rome III comparison.]
NHS UK. How to get more fibre into your diet. Last reviewed 2 March 2026. nhs.uk [Source for the 30g adult fibre target and the ~20g average adult intake.]
BNF. Constipation treatment summary. bnf.nice.org.uk [Source for bulk-forming laxatives as first line in short-duration constipation, and the class list: bran, ispaghula husk, methylcellulose, sterculia.]
NICE (2015, last updated April 2026; colorectal FIT-guided referral pathway from 2023). Suspected cancer: recognition and referral. NICE guideline NG12. [Sets the 2-week-wait referral criteria for suspected bowel cancer, referenced throughout the red flags section.]
NICE (2010, updated 2017). Constipation in children and young people: diagnosis and management. NICE guideline CG99. [Covers paediatric constipation management including macrogol as first-line treatment.]
NHS UK. Constipation. nhs.uk/conditions/constipation/ [NHS patient-facing guidance on constipation causes, treatment, and when to see a GP.]
NHS UK. Diarrhoea and vomiting. nhs.uk/conditions/diarrhoea-and-vomiting/ [NHS patient-facing guidance on acute diarrhoea, rehydration, and when to seek care.]
NICE (2015). Addendum to CG61: linaclotide for irritable bowel syndrome with constipation. [Linaclotide (Constella) is licensed in the UK for moderate to severe IBS-C in adults only, not chronic idiopathic constipation. NICE's earlier standalone evidence summary ESNM16 (2013) has been withdrawn and replaced by guideline CG61, so CG61 is the live reference.]
NICE (2010, reviewed 2014). Prucalopride for the treatment of chronic constipation in women. Technology appraisal TA211. [NICE recommendation for prucalopride (Resolor) where other laxatives have failed.]

Rome IV Criteria

Drossman DA, ed. (2016). Rome IV: Functional Gastrointestinal Disorders - Disorders of Gut-Brain Interaction. Rome Foundation. [The definitive reference for IBS diagnostic criteria using Bristol types. Subtyping criteria (IBS-C, IBS-D, IBS-M) are drawn directly from this source.]
Mearin F, Lacy BE, Chang L, et al. (2016). Bowel Disorders. Gastroenterology, 150(6):1393-1407. [Published Rome IV chapter on bowel disorders including IBS classification using Bristol scale.]

Gastroenterology and Clinical Evidence

Longstreth GF, Thompson WG, Chey WD, et al. (2006). Functional Bowel Disorders. Gastroenterology, 130(5):1480-1491. [Rome III criteria - precursor to Rome IV, establishes importance of Bristol scale in clinical classification.]
Gibson PR, Shepherd SJ (2010). Evidence-based dietary management of functional gastrointestinal symptoms: The FODMAP approach. J Gastroenterol Hepatol, 25(2):252-258. [Key reference for low-FODMAP diet evidence in IBS management.]
Pimentel M, Lembo A (2020). Microbiome and Its Role in Irritable Bowel Syndrome. Dig Dis Sci, 65(3):829-839. [Reviews gut microbiome in IBS pathophysiology.]
Quigley EM (2019). Prebiotics and Probiotics in Digestive Health. Clin Gastroenterol Hepatol, 17(2):333-344. [Evidence review of probiotic strains in gastrointestinal conditions.]
Gatta L, Scarpignato C (2017). Systematic review with meta-analysis: Rifaximin is effective and safe for the treatment of small intestine bacterial overgrowth. Aliment Pharmacol Ther, 45(5):604-616.
Camilleri M, Acosta A, Busciglio I, et al. (2015). Effect of colesevelam on faecal bile acids and bowel functions in diarrhoea-predominant irritable bowel syndrome. Aliment Pharmacol Ther, 41(5):438-448. [Bile acid diarrhoea treatment evidence.]

Paediatric Sources

Tabbers MM, DiLorenzo C, Berger MY, et al. (2014). Evaluation and treatment of functional constipation in infants and children: evidence-based recommendations from ESPGHAN and NASPGHAN. J Pediatr Gastroenterol Nutr, 58(2):258-274.
NHS Best Start in Life (formerly Start for Life). Baby poo guide. nhs.uk/best-start-in-life [NHS consumer guidance on infant stool patterns by age and feeding type. The start4life.com address now redirects here.]

Bowel Cancer and Red Flags

Bowel Cancer UK (2023). Bowel cancer symptoms. bowelcanceruk.org.uk [Patient-facing symptom guide from the UK's specialist bowel cancer charity.]
Cancer Research UK. Bowel cancer statistics. cancerresearchuk.org [UK bowel cancer incidence, screening, and outcomes data.]

IBD References

Crohn's and Colitis UK. Information and support for IBD. crohnsandcolitis.org.uk [The UK's leading IBD patient charity. Clinical resources for Crohn's disease and ulcerative colitis.]
Feuerstein JD, Cheifetz AS (2017). Crohn Disease: Epidemiology, Diagnosis, and Management. Mayo Clin Proc, 92(7):1088-1103.
Ordas I, Eckmann L, Talamini M, et al. (2012). Ulcerative colitis. Lancet, 380(9853):1606-1619.