Final answer:
The action that would be consistent with the National Database of Nursing Quality Indicators (NDNQI) measures in response to the marked increase in medication errors on the urology unit is to examine recent changes in staffing mixes.
Step-by-step explanation:
The action that would be consistent with the National Database of Nursing Quality Indicators (NDNQI) measures in response to the marked increase in medication errors on the urology unit is number 4: Recent changes in staffing mixes are examined to determine if the timing of changes coincides with the increase in errors.
This action aligns with the NDNQI measures as it focuses on investigating the staffing changes to identify any potential correlation with the increase in medication errors. By analyzing the timing of the changes, the nurse manager can identify if there are any staffing factors contributing to the errors and take appropriate action to address them.