What is an appropriate sample size concept for CDI audits?

• A. Determine sample size to achieve desired confidence level and margin of error for estimated metrics.
• B. Sample size is fixed at 100 charts for all audits.
• C. Sample size depends only on budget and staff.
• D. No sample size concept exists in CDI audits.

Answer: (A)

In CDI audits, planning the sample size means deciding how many charts to review so that the estimated metrics (like accuracy or compliance rates) have a known level of precision. You pick a desired confidence level (how sure you want to be about your estimate) and a margin of error (how close you want the estimate to be to the true population value). Then you determine the number of charts needed to meet those targets, often using a standard formula for proportions and adjusting for the population size if it's small. This approach ensures the audit results are statistically reliable rather than arbitrary. Fixed numbers, or letting budget and staffing alone drive the size, don’t guarantee the same precision across audits, and saying there’s no sample size concept ignores the essential need to estimate metrics with known accuracy.