CDAI Calculator (Crohn’s Disease Activity Index)

Written by Great Medico

Updated September 24, 2026 •2 min read

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Liver and GI risk tools often combine familiar labs in ways that are not intuitive at a glance. CDAI Calculator (Crohn’s Disease Activity Index) makes that relationship explicit and returns the exact index or score implemented in this calculator.

What this calculator does

CDAI Calculator (Crohn’s Disease Activity Index) uses Sex, Liquid/very soft stools in last 7 days, Average abdominal pain (0–3), General well-being (0–4), Number of listed complications, Antidiarrheal/opiate use, and the remaining displayed fields to produce the remission / inactive range used by this calculator. It only uses the fields shown in this calculator; it does not silently add tests, diagnoses, symptoms, or clinical variables that are absent from the interface. Implements the Crohn’s Disease Activity Index (CDAI) weighted component formula.

How to use it

Enter or select Sex, Liquid/very soft stools in last 7 days, Average abdominal pain (0–3), General well-being (0–4), Number of listed complications, and the remaining displayed fields. Keep laboratory units consistent and use values from the clinical time point required by the named model. If an input is unknown, it is better to leave the calculation unresolved than to invent a value.

How the calculation works

The Crohn’s Disease Activity Index applies its weighted formula to seven-day stool frequency, abdominal-pain rating, general well-being, complications, antidiarrheal/opiate use, abdominal mass, hematocrit deficit, and percentage deviation from standard weight. The weighted components are summed for the CDAI total.

Example

Using the calculator’s prefilled demonstration values, the primary output is 70 points, labeled “Remission / inactive range”; Stool component is 28 and Pain + well-being is 12. That sample is useful for checking the calculation path, but real interpretation should use verified measurements from the same clinical or study context.

How to interpret the result

Read remission / inactive range as the result of the named liver/GI model. Use it for the population and purpose in which the model was validated, and avoid interpreting the number as a stand-alone diagnosis, prognosis, or treatment indication.

Limitations and notes

Cutoffs can differ by disease population and guideline, and lab values can change quickly with treatment or acute illness. Use trends, the correct indication, and confirmatory testing or specialist assessment when the result could change management.