Common Factors of Specimen Rejection in the Laboratory

A general guide in rejecting laboratory specimens for clinical testing to ensure accuracy of every test performed.

If proper collection of samples is not correctly done in a clinical specimen, this may lead to inaccurate results.Below is a list of possible factors for specimen rejection:


  • Incorrect specimen collection, handling, storage, or labeling.
  • Wrong preservative or lack of preservative
  • Delayed specimen delivery
  • Incorrect or incomplete patient preparation
  • Hemolyzed blood samples
  • Incomplete sample collection, especially of timed samples
  • Old or deteriorating specimens

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