The goal of this project is to improve standardization and systemization of laboratory testing processes using a quality improvement-based toolkit to assure patients undergoing laboratory testing in the ambulatory setting do so safely and without harm from laboratory testing mistakes. The primary objectives of this project are: Optimize the practicality and relevance of existing toolkits through iterative review and revisions from patient safety experts, primary care clinicians, staff, and patients; and Implement and evaluate the improved, practical toolkit in two medium and/or large primary care practices focusing the efforts on the most common diagnostic tests—primarily blood and urine tests.