Intervention to reduce inappropriate ionized calcium ordering practices: a quality-improvement project

Area of Science:

• Clinical Chemistry
• Quality Improvement in Healthcare
• Internal Medicine

Background:

• The clinical utility of ionized calcium (iCa) testing in non-critically ill patients remains unclear.
• iCa monitoring is resource-intensive and costly compared to total calcium measurements.
• Hypothesis: iCa tests are frequently ordered for routine monitoring without impacting patient management.

Purpose of the Study:

• To analyze iCa test ordering patterns among hospital-based internal medicine clinicians.
• To implement an intervention to modify iCa test ordering practices.

Main Methods:

• Quality improvement project utilizing retrospective chart review.
• Identified 100 consecutive patients with iCa tests ordered by internal medicine.
• Conducted an educational intervention on appropriate iCa testing.
• Assessed intervention impact by comparing pre- and post-intervention iCa test ordering rates.

Main Results:

• Internal medicine services accounted for 38% of iCa tests pre-intervention.
• Post-intervention, internal medicine services accounted for 13% of iCa tests, a 66% reduction (p=0.0007).
• The intervention significantly decreased iCa test ordering by internal medicine clinicians.

Conclusions:

• Clinician education is an effective strategy to reduce unnecessary ionized calcium monitoring.
• This intervention improved the appropriateness of iCa test utilization in hospitalized patients.
• Reduces laboratory resource consumption and healthcare costs.