Which future corrective action would best reduce the problem of inaccurate blood typing?

Proficiency testing is an effective method to reduce the problem of inaccurate blood typing because it involves the assessment of laboratory staff's ability to perform tests accurately and consistently. In proficiency testing, samples with known results are sent to participating laboratories, which then report their findings. This process helps identify whether the laboratory personnel can accurately type blood samples and enhances their skills through feedback and remediation if needed.

By regularly participating in proficiency testing, laboratories can ensure that staff are knowledgeable about the latest techniques and adhere to best practices in blood typing. This kind of ongoing assessment helps maintain high standards of quality and accuracy in laboratory operations, ultimately reducing the incidence of errors in blood typing.

On the other hand, written testing evaluates theoretical knowledge but may not directly impact practical skills in blood typing. Calibration testing is important for ensuring that the instruments used are functioning correctly, but it does not necessarily address human factors that lead to inaccuracies. Evidence-based testing focuses on using proven methods and guidelines, which can be beneficial, but proficiency testing specifically targets the performance of personnel and is more directly linked to minimizing typing errors.