C. difficile LabID Event: Onset Category, Incident or Recurrent, and Rate (NHSN)
C. difficile LabID event category under the CDC NHSN protocol.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Specimen collection date
- 2026-03-20
- Where the specimen was collected
- Inpatient location
- Admission date
- 2026-03-17
- Earlier inpatient discharge from this facility
- No inpatient discharge from this facility before the specimen
- Previous C
- A previous positive, same patient and same location
- Collection date of the most recent previous positive
- 2026-03-06
Result: Healthcare facility-onset (HO): collected in an inpatient location on hospital day 4, which is day 4 or later. Recurrent (day 15, more than 14 and 56 or fewer days after the most recent event).
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Specimen collection date (YYYY-MM-DD)
- Where the specimen was collected
- Admission date (YYYY-MM-DD; inpatient specimens)
- Earlier inpatient discharge from this facility
- Date of that discharge (YYYY-MM-DD)
- Previous C.
- Collection date of the most recent previous positive (YYYY-MM-DD)
- Rate panel: number of events (optional)
- Rate panel: patient days (optional)
Full field descriptions
- Previous C. difficile positive
How this is calculated
Citation
CDC National Healthcare Safety Network. Multidrug-Resistant Organism and Clostridioides difficile Infection (MDRO/CDI) Module protocol, January 2026: duplicate test, onset categories (CO, CO-HCFA, HO), incident and recurrent definitions, and the rate per 10,000 patient days. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.