Quality control procedures may include the following:

• monitoring variables within the laboratory, like water quality, glassware calibration, and instrument calibration, that may affect results
• defining protocols for performing quality control for each test procedure
• participating in proficiency testing programs
• graphing quality control results
• performing daily and periodic analysis of quality control data and charts
• troubleshooting quality control errors
• documenting quality control errors, including the steps taken to resolve the problem and verification of success
• performing routine maintenance of laboratory instruments
• keeping records