Antimicrobial Days per 1,000 Days Present, per 100 Admissions, and SAAR (NHSN)
Antimicrobial use rates in the CDC NHSN definitions: antimicrobial days per 1,000 days present, per 100 admissions (facility-wide inpatient only), and the SAAR as observed over predicted days.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Scope
- Facility-wide inpatient (FacWideIN)
- Antimicrobial days
- 4200
- Days present
- 9000
- Admissions
- 1500
- Predicted antimicrobial days from the NHSN report
- 4000
Result: 466.67 antimicrobial days per 1,000 days present; 280 per 100 admissions; SAAR 1.05.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Scope
- Antimicrobial days
- Days present
- Admissions (facility-wide inpatient only; optional)
- Predicted antimicrobial days from the NHSN report (optional, for the SAAR)
How this is calculated
Citation
CDC National Healthcare Safety Network. Antimicrobial Use and Resistance (AUR) Module protocol, July 2026: Table 4 (antimicrobial days per 1,000 days present; per 100 admissions, facility-wide inpatient only) and the Standardized Antimicrobial Administration Ratio. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.