Using a Youden Plot

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

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Using a Youden Plot

  • Controls are run and plotted.
  • Plots that lie near the 45-degree reference line and within the one and two standard deviation squares show acceptable results.
  • Points that lie near the 45-degree reference lines but outside the 2SD square indicate a systematic error.
  • Points that lie far from ether 45-degree reference line indicate a random error.