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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Systematic Error

Systematic error causes inaccurate results that are consistently low or high. Factors that contribute to systematic error include:

  • Change in reagent lot
  • Change in calibration
  • Wrong calibrator values assigned
  • Improperly prepared or deteriorating reagents
  • Pipettor maintenance error (not adjusted correctly or misaligned)
  • Deterioration of a photometric light source