Device Utilization Ratio (NHSN, Device Days Over Patient Days)
Device days divided by patient days for a central line, urinary catheter or ventilator: the NHSN device utilization ratio.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Device
- Central line
- Device days
- 310
- Patient days
- 1000
Result: Central Line Utilization Ratio 0.31: a device on 31% of patient days (310 central line days ÷ 1,000 patient days).
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Device
- Device days
- Patient days
How this is calculated
Citation
CDC National Healthcare Safety Network. Patient Safety Component Manual, January 2026: chapter 4 (CLABSI), chapter 7 (CAUTI) and chapter 10 (VAE), Device Utilization Ratio: device days divided by patient days. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.