QAPI 176: Improving Diagnostic Accuracy: Evidence-Based Strategies to Decrease ED Blood Culture Contamination.

Background

• Blood culture  contamination is a persistent problem in emergency departments (EDs), contributing to unnecessary antibiotic exposure, excessive diagnostic testing, and increased length of stay.
• National benchmarks define <3% contamination as acceptable, yet emerging evidence supports a more ambitious goal of ≤1%. 
• In early 2023, contamination rates at two EDs within a two-hospital system exceeded

Methods

• This project was conducted in two busy EDs (44,000–60,000 annual visits). 
• A baseline one-week audit found multiple failure points including inadequate skin antisepsis, lack of initial blood diversion, syringe draws, improper fill     volumes, and inconsistent bottle inoculation techniques. 
• A multifaceted intervention began in June 2023 and included: 
   
  1. Standardized blood culture collection kits
   
  2. Adoption of a passive BDD (Kurin Lock®)
   
  3. Targeted staff education and hands-on competency training
   
  4. Elimination of line draws
   
  5. Real-time feedback with follow-up for contamination events.

 Results

• Contamination rates were evaluated for 12 months pre-intervention, during a 4-month pilot (Sept–Dec 2023), and over 12 months post-implementation. 
• These rates are displayed on Figure 1.
• Overall, there was a 67% decrease in ED A and a 29% decrease in ED B. 
• No missed bacteremias or adverse events occurred.

Conclusions

• Standardizing Blood culture contamination practices combined with implementation of a diversion device substantially reduced ED blood culture contamination rates.
• Contamination rates approaching the ≤1% target are achievable in high-volume emergency departments when evidence-based technology is paired with staff education and competency validation.
• Ongoing monitoring and real-time feedback helped sustain improvements, highlighting the importance of the continuous quality improvement process.

Practice Implications

• Reducing blood culture contamination supports diagnostic and antimicrobial stewardship by decreasing unnecessary antibiotics, repeat testing, and avoidable healthcare utilization.
• These findings support incorporating standardized kits, diversion devices, and ongoing feedback into ED protocols as part of broader diagnostic stewardship and patient safety initiatives.
• Embedding standardized blood culture collection protocols into orientation, annual competencies, and ongoing staff training can promote long-term adherence to best practices and help to sustain low blood culture contamination rates.

‍