Accuracy and Precision

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The page below is a sample from the LabCE course Introduction to Quality Control. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Accuracy and Precision

Quality control comprises both accuracy and precision.

Accuracy: refers to the closeness of the measured quantitative value to the reference value.
  • Systematic errors will affect a system's accuracy.
  • Bias is an estimate of systematic error.
Precision refers to the agreement of results upon replicate testing of a material or similar material under specified conditions.
  • Random errors will affect a test system's precision.
  • Standard deviation and coefficient of variation are measures of imprecision.