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Harvey-Bradshaw Index (HBI) Calculator
x402
Harvey-Bradshaw Index (HBI) Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Calculates the Harvey-Bradshaw simple Crohn's Disease Activity Index score from one day of symptom and complication data
Price / call$0.005
Success—
StatusUnknown
How this service works
Harvey and Bradshaw 1980 simple Crohn's-disease activity index (one-day; items 1-3 previous day). Well-being 0-4, abdominal pain 0-3, liquid stools (1 point each; magent clamp 0-30), abdominal mass 0-3, plus 1 per listed complication (arthralgia, uveitis, erythema nodosum, aphthous ulcers, pyoderma gangrenosum, anal fissure, new fistula, abscess). magent sums only (max 48) and does not return later remission cutoffs. Not a Crohn's diagnosis or Best 1976 CDAI. magent does not examine the patient.
Output
A numeric Harvey-Bradshaw Index (HBI) total score between 0 and 48 (maximum), computed by summing: well-being (0–4), abdominal pain (0–3), one point per liquid stool (clamped at 30), abdominal mass (0–3), and one point per present complication (arthralgia, uveitis, erythema nodosum, aphthous ulcers, pyoderma gangrenosum, anal fissure, new fistula, abscess). The endpoint does not provide a remission classification or diagnosis.
Example use cases
Daily Crohn's symptom diary scoring
“My Crohn's patient kept a symptom diary yesterday: well-being 1 (slightly below par), abdominal pain 2, 6 liquid stools, no abdominal mass, and they have aphthous ulcers and arthralgia — can you calculate their Harvey-Bradshaw score?”
Remote patient monitoring HBI tracking
“Score the Harvey-Bradshaw Index for today's patient-reported data: well-being 3, abdominal pain 3, 8 liquid stools, abdominal mass 1, with a new fistula and abscess present, no other complications.”
Clinical trial eligibility pre-screen
“I need the Harvey-Bradshaw Index calculated: well-being 0 (very well), abdominal pain 0, 1 liquid stool, abdominal mass 0, and none of the listed complications are present — what's the total HBI score?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/harvey_bradshawWhen to prefer
Use this endpoint when you need a fast, deterministic computation of the Harvey-Bradshaw simple Crohn's Disease Activity Index from a single day of patient-reported or clinician-recorded data. Prefer this over manual calculation when building clinical decision support tools, patient monitoring apps, or research pipelines. Do not use for the full Best 1976 CDAI (which requires 7-day data), for diagnosis, or for determining remission thresholds beyond the raw score.
Side effects
- Missing required query parameters returns an error
- Out-of-range integer values (e.g. well_being > 4 or liquid_stools > 30) may be rejected or clamped
- Non-boolean values passed for complication flags cause validation errors
- Network or payment-related failures (x402 payment not accepted) block the response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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