Important Concepts in Quality Control: Random and Systematic Error

Systematic Error

  • Systematic error occurs when something alters the testing process, causing all results to be biased.
  • For example, systematic error may occur when improper standards are used or a dirty lens is present in a measuring device.
  • Both patient results and control measurements are affected by systematic error, making it more difficult to detect.
  • Changes in the statistical mean are an indication of a systematic error and must be investigated.

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