Carryover and Cross-Contamination in Blood Collection
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Questions and Answers

What is carryover or cross-contamination in the context of blood collection?

  • The transfer of blood from one tube to the next during ETS blood collection
  • The process of filling specimen tubes from the bottom up to minimize contamination
  • The contamination of additive tubes with previous blood samples, affecting test results (correct)
  • The interference of heparin in coagulation tests

    • Which additive in tubes has been identified as the source of more carryover problems than any other additive?

  • EDTA (correct)
  • Oxalate
  • Heparin
  • Citrate

    • Why does heparin cause the least interference in tests other than coagulation tests?

  • Because it occurs naturally in blood (correct)
  • Because it does not affect the order of draw
  • Because it prevents carryover during blood collection
  • Because it is less prone to contamination

    • What strategy eliminates confusion and presents a sequence of blood collection that results in the least amount of interference from carryover?

    <p>Order of draw</p> Signup and view all the answers

    How can the chance of carryover be minimized during blood collection?

    <p>By making certain that specimen tubes fill from the bottom up and preventing contact with the back end of the needle within the tube holder</p> Signup and view all the answers

    According to CLSI, what may contaminate specimens for trace element tests?

    <p>Additives in blood collection tubes</p> Signup and view all the answers

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