To ensure reliability of results, many other factors besides controls are monitored. These include:

• water quality
• analytic balance calibration
• glassware calibration
• centrifuge calibration
• thermometer calibration
• electric power stability
• heating bath temperatures
• refrigerator temperatures
• freezer temperatures
• expiration of reagents, standards, and controls
• instrument maintenance
• procedure manuals, including written step-by-step procedures of all tests performed by laboratory
• method selection, based on local population and clinician needs
• normal range verification based on the local population
• technical competencies of laboratory staff members