Sample Preservation for Coagulation Testing
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Questions and Answers

What is the main purpose of sample preservation in routine coagulation testing?

  • To speed up the testing process
  • To ensure accurate measurement of coagulation parameters (correct)
  • To increase the volume of samples collected
  • To reduce the cost of testing

Which phase of coagulation testing is most susceptible to errors, according to the text?

  • Pre-analytical phase (correct)
  • Post-analytical phase
  • Analytical phase
  • Transportation phase

What is the optimum ratio of anticoagulant trisodium citrate to blood for sample collection?

  • 1:15
  • 1:10
  • 1:9 (correct)
  • 1:5

Which method is NOT mentioned as a way of obtaining specimens during the sample collection phase?

<p>Needle aspiration (D)</p> Signup and view all the answers

What is the primary consequence of errors in the pre-analytical phase of coagulation testing?

<p>Affected measurement accuracy (B)</p> Signup and view all the answers

What is the recommended method for mixing blood with the anticoagulant after collection?

<p>End-over-end inversions (C)</p> Signup and view all the answers

What are the two factors affecting sample transportation mentioned in the text?

<p>Temperature and length (C)</p> Signup and view all the answers

How long can plasma samples for Prothrombin Time (PT) be stored at 2-8°C if immediate testing is not possible?

<p>Up to 24 hours (D)</p> Signup and view all the answers

What is the recommended storage temperature for long-term storage of specimens in the text?

<p>-20°C (D)</p> Signup and view all the answers

Which phase of laboratory testing involves activities related to result interpretation, result verification, and result reporting?

<p>Post-analytical phase (D)</p> Signup and view all the answers

What is the recommended quality control material mentioned in the text for the Sysmex XP-300?

<p>Eightcheck-3WP with three levels: Normal(-N), Low(-L), and High(-H) (A)</p> Signup and view all the answers

In sample analysis using the Sysmex XP-300, what should be done after entering the sample ID?

<p>Set uncapped specimen to sample probe and press the Start Switch (D)</p> Signup and view all the answers

What is the recommended size range for platelets in the RBCs Histograms according to the text?

<p>2-30 fl (A)</p> Signup and view all the answers

What is the term used to refer to the actual number of each type of white blood cells in differential leukocytes count?

<p>Absolute count (B)</p> Signup and view all the answers

What is the method used to analyze the released haemoglobin from cells in the Sysmex XP-300?

<p>Spectrophotometric analysis at 555nm (B)</p> Signup and view all the answers

What is the principle behind the impedance principle of cell counting?

<p>Detection and measurement of changes in electrical resistance produced by cells as they traverse a small aperture (A)</p> Signup and view all the answers

What is the purpose of the pulse height analyzers in the automated hematology analyzer?

<p>To collect and sort pulses according to their amplitude (C)</p> Signup and view all the answers

In which phase of laboratory testing are result interpretation, result verification, and result reporting activities involved?

<p>Post-analytical phase (A)</p> Signup and view all the answers

What are the clinical significance of CBC tests include?

<p>Bone Marrow disorders, Leukemias, Auto-immune disorders (C)</p> Signup and view all the answers

What does the electronic impedance (resistance) principle of cell counting involve?

<p>Applying low-frequency electrical current between two electrodes to measure changes in electrical resistance produced by cells (A)</p> Signup and view all the answers

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