17 Questions
Which of the following is necessary for normal clot retraction?
Low levels of calcium
In thrombocythemia, what is abnormal in terms of clot retraction?
Platelet function
What is the purpose of the Hirscboeck method in platelet function analysis?
To observe clot retraction
What does the Steffani method aim to inspect in whole blood?
Clot retractility
In the Mac Farlane method, what is measured after incubating whole blood?
% of serum left after retraction
What parameter is measured in the Cartidges used in platelet function analysis?
Closure time
Which of the following is an aggregating agent used in platelet lumi-aggregometry?
Thrombin receptor activating peptide (TRAP)
What is the ratio of specimen to anticoagulant in platelet lumi-aggregometry?
9:1
Which syndrome is NOT associated with abnormal platelet function?
Rumple Leed syndrome
In platelet lumi-aggregometry, what is measured simultaneously with platelet aggregation?
Secretion of adenosine triphosphate (ATP)
Which of the following is NOT an agonist used in aggregometry systems that measure only aggregation?
Arachidonic acid
What is the visual method of choice for performing a manual platelet count according to the text?
Phase-contrast microscope
What is the diameter of the suction cup used in the Hess test for counting petechiae?
2cm
What is the minimum number of petechiae per 1 square inch considered a positive result in the tourniquet test?
10
Which method uses monoclonal antibodies to platelet-specific targets for platelet enumeration?
RBC/platelet ratio method
What is the diluting fluid used for leukocyte cell count according to the text?
Weak acid
Which test employs a suction cup on the upper arm at 200-250 torr pressure to count petechiae?
Hess test
Test your knowledge on clot retraction in the Platelet Function Analyzer (PFA) - 100/200. Learn about the process of whole blood clotting and factors affecting clot retraction such as fibrinogen levels, calcium, ATP, and platelet functionality.
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