Quality Control ensures both precision and accuracy of patient sample results, meanwhile Quality Assurance enables laboratories to achieve and maintain high levels of accuracy and proficiency despite changes in test methods and the volume of specimens tested.

The Levey-Jennings chart is a graphical tool used to monitor the quality control data of laboratory tests. By plotting the data on the chart, it provides a visual representation to assess the performance of the test and determine if it is functioning effectively.

Accuracy is the degree to which the result of a measurement, calculation, or specification conforms to the correct value or a standard.

As for Precision, it is a measure of consistency and shows how close the measured values are to one another.

Systems and Analysis Design is the formal process of identifying and studying a problem then creating an effective solution.