Platelet Enumeration and Function Quiz

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What is the distinctive feature of platelets?

Circular to ellipsoidal shape (correct)

Linear shape

Presence of a nucleus

Star-shaped

Which of the following is NOT a function of platelets?

Blood coagulation

Adhesion

Clot retraction

Respiration (correct)

In platelet chemistry, which amino acid is commonly found?

Glutamine

Arginine

Lysine

Aspartic acid (correct)

What is the primary method used for determining platelet count?

Rees-ecker method Signup and view all the answers

Which test measures the adhesion of platelets to a wound surface?

Saizman method Signup and view all the answers

What does the in vivo method of Brochgrevink measure?

Adhesion of platelets to collagen fibers Signup and view all the answers

What is the purpose of the glass bead column method described in the text?

To measure the percentage of platelets retained from venous blood Signup and view all the answers

In the test for adhesion of platelets to collagen fibers, what is the technique based on?

Enumeration of free and adherent platelets Signup and view all the answers

What is the purpose of the platelet function tests described in the text?

To qualitatively and quantitatively evaluate specific platelet functions Signup and view all the answers

What is the normal range for the clot retraction time according to the text?

30-60 minutes and complete in 18-24 hours Signup and view all the answers

Which method is described in the text for the quantitative determination of clot retraction?

Macfarlane method Signup and view all the answers

What is the normal range for the platelet factor 3 availability test described in the text?

37-51 seconds Signup and view all the answers

Which of the following is the principle behind the clot retraction determination method?

Evaluating the volume of serum obtained from a clotted blood sample Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

Which method is used to assess platelet adhesion to collagen fibers?

None of the above Signup and view all the answers

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) Signup and view all the answers

Which technique is described as a negative pressure method for assessing capillary fragility?

Suction cup or petechiometer method Signup and view all the answers