Final answer:
The action consistent with the National Database of Nursing Quality Indicators (NDNQI) measures in response to the marked increase in medication errors on the urology unit would be examining recent changes in staffing mixes to determine if they coincide with the increase in errors.
Step-by-step explanation:
The action consistent with the National Database of Nursing Quality Indicators (NDNQI) measures in response to the marked increase in medication errors on the urology unit would be option d, which is examining recent changes in staffing mixes to determine if they coincide with the increase in errors.
By examining the timing of staffing changes, the nurse manager can identify whether there is a correlation between the changes and the increase in medication errors. This information can help address any issues related to staffing that may be contributing to the errors and guide appropriate interventions.