PUBLIC LIBRARY / CALCULATOR

Harvey–Bradshaw Index

A simplified CDAI assessing clinical Crohn’s activity from a single day’s data, used to follow treatment response in clinic.

Calculate with transparency

Check the population, units and version. The result shows the formula or classification; it does not make an automatic treatment decision.

Preparing the form…

Check the method
Enter the data
Check the result

Method · Limits of application

HBI/Harvey–Bradshaw 1980: 5 domains, open liquid-stool count; not CDAI

Harvey–Bradshaw describes clinical activity in Crohn’s disease, including the number of liquid stools on the previous day and assessment of an abdominal mass and complications. It does not diagnose Crohn’s disease or replace assessment of inflammation or other causes of symptoms. Its relationship with CDAI is good but imperfect: Best 2006 analyzed 224 visits and documented prediction limits, so HBI cannot be converted to an exact CDAI. Response and remission findings from the cited studies belong to those trial populations and periods.

Conditions of use

Check the population, units, inclusion and exclusion criteria, and version in the original source. A result alone does not establish a diagnosis, discharge decision or prescription.

Documented parameters

General well-being (previous day)
Abdominal pain (previous day)
Liquid or very soft stools (previous day) · per day
Abdominal mass
Arthralgia
Uveitis
Erythema nodosum
Aphthous ulcers
Pyoderma gangrenosum
Anal fissure
New fistula
Abscess

4/4 reference cases checked. Numerical tests are not clinical validation.

Sources and documentation

Documented formula

Transcribed from the source or a recorded revision; this is not a clinical recommendation.

Well-being (0–4) + abdominal pain (0–3) + number of liquid stools the previous day + abdominal mass (0–3) + 1 point per present complication.

References

Identifier: harvey-bradshaw

Original clinical content: Brazilian Portuguese.

Method version

HBI/Harvey–Bradshaw 1980: 5 domains, open liquid-stool count; not CDAI

harvey-bradshaw@native-2026-10-05+340b9c0a2ccd

Source for the active edition

The bibliographic edition identifies the source. By itself, it proves neither full conformity of the formula nor clinical approval.

Synthetic cases checked (4)

Synthetic cases for checking the implementation, with no patient data.

Case 1

reference-001

Inputs

General well-being (previous day): Very well
Abdominal pain (previous day): None
Liquid or very soft stools (previous day): 2 per day
Abdominal mass: Absent
Arthralgia: No
Uveitis: No
Erythema nodosum: No
Aphthous ulcers: No
Pyoderma gangrenosum: No
Anal fissure: No
New fistula: No
Abscess: No

{
  "bem": "0",
  "dor": "0",
  "evac": 2,
  "massa": "0",
  "artralgia": false,
  "uveite": false,
  "eritema": false,
  "aftas": false,
  "pioderma": false,
  "fissura": false,
  "fistula": false,
  "abscesso": false
}

Expected result

{
  "score": 2,
  "level": "low",
  "verdict": "Remissão"
}

Actual result

{
  "score": 2
}

Case 2

reference-002

Inputs

General well-being (previous day): Slightly below normal
Abdominal pain (previous day): Mild
Liquid or very soft stools (previous day): 3 per day
Abdominal mass: Absent
Arthralgia: No
Uveitis: No
Erythema nodosum: No
Aphthous ulcers: No
Pyoderma gangrenosum: No
Anal fissure: No
New fistula: No
Abscess: No

{
  "bem": "1",
  "dor": "1",
  "evac": 3,
  "massa": "0",
  "artralgia": false,
  "uveite": false,
  "eritema": false,
  "aftas": false,
  "pioderma": false,
  "fissura": false,
  "fistula": false,
  "abscesso": false
}

Expected result

{
  "score": 5,
  "level": "mid",
  "verdict": "leve"
}

Actual result

{
  "score": 5
}

Case 3

reference-003

Inputs

General well-being (previous day): Poor
Abdominal pain (previous day): Moderate
Liquid or very soft stools (previous day): 8 per day
Abdominal mass: Definite
Arthralgia: Yes
New fistula: Yes
Uveitis: No
Erythema nodosum: No
Aphthous ulcers: No
Pyoderma gangrenosum: No
Anal fissure: No
Abscess: No

{
  "bem": "2",
  "dor": "2",
  "evac": 8,
  "massa": "2",
  "artralgia": true,
  "fistula": true,
  "uveite": false,
  "eritema": false,
  "aftas": false,
  "pioderma": false,
  "fissura": false,
  "abscesso": false
}

Expected result

{
  "score": 16,
  "level": "high",
  "verdict": "moderada"
}

Actual result

{
  "score": 16
}

Case 4

reference-004

Inputs

General well-being (previous day): Very poor
Abdominal pain (previous day): Intense
Liquid or very soft stools (previous day): 10 per day
Abdominal mass: Definite and tender
Uveitis: Yes
Abscess: Yes
Arthralgia: No
Erythema nodosum: No
Aphthous ulcers: No
Pyoderma gangrenosum: No
Anal fissure: No
New fistula: No

{
  "bem": "3",
  "dor": "3",
  "evac": 10,
  "massa": "3",
  "uveite": true,
  "abscesso": true,
  "artralgia": false,
  "eritema": false,
  "aftas": false,
  "pioderma": false,
  "fissura": false,
  "fistula": false
}

Expected result

{
  "score": 21,
  "level": "high",
  "verdict": "grave"
}

Actual result

{
  "score": 21
}

Code and reproducibility

This tool’s code on GitHub

Download code and tests

Sources, version and reproduction instructions

README

Local installation

Code license: Apache-2.0

Guidelines and conditions

This repository’s license applies to the code. Third-party instruments, questionnaires, data and models remain subject to their owners’ conditions.

The code tests are technical checks. Clinical approval and professional translation review are recorded separately.

Relationship with cancer research

General context — relationship to be defined

A resource for general clinical contexts. This edition does not assign a specific oncological relationship; selecting it for a study requires a justified question, population and purpose.