What is a preanalytical error that can affect test results during a venipuncture procedure?

The correct answer is incorrect, as reading the requisition order does not qualify as a preanalytical error. Preanalytical errors refer specifically to issues that can occur before the actual analysis of the specimen, often related to sample collection, handling, or patient factors.

A prime example of a preanalytical error is incorrect patient identification, which can lead to mix-ups in results between patients. If the phlebotomist fails to properly confirm the patient's identity before drawing blood, this can result in testing the wrong individual's sample, ultimately affecting patient care and diagnosis.

Using expired tubes is also a significant preanalytical error, as using tubes that are no longer viable can compromise the integrity of the sample and yield unreliable results.

Inadequate tourniquet application can affect the venous blood flow during the venipuncture process, potentially leading to hemolysis or inaccurate concentration of analytes in the specimen.

Understanding the types of errors that can occur during the preanalytical phase is crucial for ensuring accurate laboratory results and enhancing patient safety.