Validity and reliability

This page describes the factors that affect test results.

  • Preanalytical variables include physiological factors, patient preparation, specimen collection and transport.
  • Analytical variables include the precision and accuracy of the test method and factors which may interfere with a particular assay eg, lipaemia, in vitro haemolysis, and medications.
  • Post-analytical variables include data entry and calculations by laboratory staff, result validation, interpretation of the result, data transfer and the method used to report the results (electronic, paper or telephone).

Last Updated on Tuesday, 02 February 2010 15:57