Calc Function

    • Calcs that help predict probability of a diseaseDiagnosis
    • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
    • Disease is diagnosed: prognosticate to guide treatmentPrognosis
    • Numerical inputs and outputsFormula
    • Med treatment and moreTreatment
    • Suggested protocolsAlgorithm





    Chief Complaint


    Organ System


    Patent Pending

    Bristol Stool Form Scale

    Classifies stool (correlates with intestinal transit time).
    When to Use

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    Separate hard lumps, like nuts (hard to pass)
    Sausage-shaped but lumpy
    Like a sausage but with cracks on its surface
    Like a sausage or snake, smooth and soft
    Soft blobs with clear-cut edges (passed easily)
    Fluffy pieces with ragged edges, a mushy stool
    Watery, no solid pieces, entirely liquid

    Diagnostic Result:

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    Next Steps
    Creator Insights


    Do you use the Bristol Stool Scale and want to contribute your expertise? Join our contributor team!

    Dr. Stephen J. Lewis

    About the Creator

    Stephen J. Lewis, MD, MB ChB (Aber), BSc(Hons), FRCP, is a gastroenterologist at Derriford Hospital in Plymouth, United Kingdom and an affiliate of the Bristol Nutrition Biomedical Research Unit in Bristol. He trained in infectious diseases at the Hospital for Tropical Diseases in London and worked with medical charities in West Africa. Dr. Lewis’ primary research interests include perioperative nutrition, infectious disease, irritable bowel syndrome, malabsorption, and intestinal infections.

    To view Dr. Stephen J. Lewis's publications, visit PubMed