18 Questions
What is the distinctive feature of platelets?
Circular to ellipsoidal shape
Which of the following is NOT a function of platelets?
Respiration
In platelet chemistry, which amino acid is commonly found?
Aspartic acid
What is the primary method used for determining platelet count?
Rees-ecker method
Which test measures the adhesion of platelets to a wound surface?
Saizman method
What does the in vivo method of Brochgrevink measure?
Adhesion of platelets to collagen fibers
What is the purpose of the glass bead column method described in the text?
To measure the percentage of platelets retained from venous blood
In the test for adhesion of platelets to collagen fibers, what is the technique based on?
Enumeration of free and adherent platelets
What is the purpose of the platelet function tests described in the text?
To qualitatively and quantitatively evaluate specific platelet functions
What is the normal range for the clot retraction time according to the text?
30-60 minutes and complete in 18-24 hours
Which method is described in the text for the quantitative determination of clot retraction?
Macfarlane method
What is the normal range for the platelet factor 3 availability test described in the text?
37-51 seconds
Which of the following is the principle behind the clot retraction determination method?
Evaluating the volume of serum obtained from a clotted blood sample
What is the significance of the platelet count in the context of capillary fragility or resistance tests?
Platelets play a crucial role in maintaining capillary integrity and resistance
In the Rumpel-Leede or Hess test, what is the principle behind the formation of petechiae?
Increased venous pressure leads to intravasation of blood, forming petechiae
Which method is used to assess platelet adhesion to collagen fibers?
None of the above
What is the grading system used for evaluating the severity of petechiae in the Rumpel-Leede or Hess test?
1+ (1-10 petechiae), 2+ (11-20 petechiae), 3+ (21-50 petechiae), 4+ (50 and above)
Which technique is described as a negative pressure method for assessing capillary fragility?
Suction cup or petechiometer method
Test your knowledge on platelets including their origin, characteristics, distribution in the body, normal count, and functions in primary hemostasis. Explore concepts related to thrombocytosis and thrombocytopenia.
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