Post-Analytical Variables in Phlebotomy
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Questions and Answers

What is the responsibility of the phlebotomist in relation to test results?

  • Controlling pre-analytical variables (correct)
  • Ensuring proper transport conditions
  • Analyzing the specimen
  • Managing post-analytical variables

    • What can cause hemolysis if done incorrectly during specimen collection?

  • Holding the syringe upright
  • Filling the tube slowly
  • Activating the safety device on the needle
  • Pushing on the plunger while filling the tube (correct)

    • Which type of variable can be affected by pre-analytical variables such as collection time or transport conditions?

  • Control variables
  • Analytical variables (correct)
  • Specimen variables
  • Post-analytical variables

    • Where do most errors in pre-analytical variables occur?

    <p>During specimen collection</p> Signup and view all the answers

    What effect do samples from patients on anticoagulants have on clotting times?

    <p>They have longer clotting times</p> Signup and view all the answers

    How quickly do samples with clot activators clot?

    <p>Within 30 minutes</p> Signup and view all the answers

    What is the principle of balancing samples in a centrifuge?

    <p>Every sample must be balanced by another of equal weight</p> Signup and view all the answers

    Why is repeated centrifugation of a specimen not recommended?

    <p>It may increase hemolysis of the sample and deterioration of analytes</p> Signup and view all the answers

    What danger does an unbalanced load in a centrifuge pose?

    <p>It can cause the rotor of the centrifuge to spin out of center, leading to damage and potential biohazard</p> Signup and view all the answers

    Amber-colored microtubes are used to collect samples to expose them to light.

    <p>False</p> Signup and view all the answers

    Samples are transported to the laboratory depending on the size of the institution and the degree of specialization within it.

    <p>True</p> Signup and view all the answers

    In larger hospitals, samples are hand-carried by the phlebotomist or another member of the laboratory team.

    <p>False</p> Signup and view all the answers

    A logbook at the drop-off and pickup area should include the patient's name, hospital number, specimen type, and the date and time of delivery.

    <p>True</p> Signup and view all the answers

    Some institutions use a pneumatic tube system for sample transport that travels within a network of tunnels.

    <p>False</p> Signup and view all the answers

    What is a common task for a phlebotomist when transferring serum or plasma to plastic transport tubes?

    <p>Matching patient information on the original tube with the transport tube label</p> Signup and view all the answers

    What are the potential consequences of improper sample collection in a laboratory setting?

    <p>Delays in reporting, unnecessary re-draws/retests, decreased customer satisfaction, increased costs, incorrect diagnosis/treatment, injury, and occasionally death.</p> Signup and view all the answers

    Why is specimen adequacy checking considered a critical factor in test result accuracy and usefulness?

    <p>Specimen adequacy checking is important to ensure that samples are not missing, coagulated, hemolysed, insufficient, or incorrect due to inappropriate collection and handling.</p> Signup and view all the answers

    What is a major factor leading to the rejection of samples in laboratory testing?

    <p>Insufficient volume</p> Signup and view all the answers

    What are some reasons for insufficient volume in samples collected from patients?

    <p>Ignorance of the phlebotomist, difficult sampling (e.g., in pediatric patients), debilitated cases, patients on chemotherapy, and those with difficult to localize veins.</p> Signup and view all the answers

    How can incorrect phlebotomy practices contribute to pre-analytical errors?

    <p>Incorrect phlebotomy practices can occur due to lack of knowledge or heavy workload, leading to pre-analytical errors.</p> Signup and view all the answers

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