control charting, which is a form of internal quality control, and proficiency testing, which is a form of external quality control. The main focus is on control charts, as they are the simplest and ...

<a href="https://www.medindia.net/health-infographics/diabetes-control-chart.htm"> <img data-src="https://www.medindia.net/health-infographics/images/diabetes-control ...