Hemostasis

Question 1

Why are platelets hard to count?

Answer 1

They easily disintegrate
Small, colorless, refractile bodies
Difficult to distinguish from debris
unevenly distributed in the blood
tend to attach to foreign surface
tend to clump with each other

Question 2

What factors are present in fresh plasma?

Answer 2

Factor I, II, V, VII, VIII, IX, X, XI, XII, XIII

(All factors)

Question 3

What factors are present in adsorbed plasma?

Answer 3

Factor I, V, VIII, X, XII, XIII

Question 4

Factors absent in adsorbed plasma

Answer 4

Factor IX, X, VII, III

Question 5

Factors present in aged plasma

Answer 5

Factor I, II, VII, IX, X, XI, XII, XIII

Question 6

What factors are absent in aged plasma?

Answer 6

Factors V and VIII

Question 7

Factors present in normal serum

Answer 7

Factor II (20%), VII, IX, X, XI, XII

Question 8

Factors absent in the normal serum

Answer 8

Factor I, V, VIII, XIII

Question 9

Why do normal serum and aged serum have an absence in Fibrinogen group?

Answer 9

They are consumed during the clotting process

Question 10

What differenciates the normal serum from the aged serum?

Answer 10

Aged serum has no Factor II

Question 11

What is the best indirect method of quantifying platelets?

Answer 11

Olef’s method

Question 12

What is the most accurate method of counting platelets?

Answer 12

Direct method

Question 13

What does the bleeding time test for?

Answer 13

Measures the time required for the bleeding to stop

Question 14

What is the method of testing the bleeding time using the pricking of the earlobe or the finger?

Answer 14

Duke method

Question 15

What is the normal value of duke method?

Answer 15

2-4 minutes

Question 16

What test uses aspirin to check for von Willeband deficiency?

Answer 16

Aspirin tolerance test

Question 17

What needle gauge is used for coagulation samples?

Answer 17

20-gauge

Question 18

What needle gauge is used when collecting more than 20 mL of blood?

Answer 18

19-gauge

Question 19

What is the blood to anticoagulant ratio of 3.8% trisodium citrate?

Answer 19

4:1

Question 20

What is the blood to anticoagulant ratio of 3.2% trisodium citrate?

Answer 20

9:1

Question 21

What is the coating used in syringes and evacuation tubes?

Answer 21

Silicon

Question 22

NV for whole blood clotting time:

Answer 22

7-15 minutes

Question 23

NV for capillary clotting time:

Answer 23

2-4 minutes

Question 24

What is the gold standard for the direct method of testing for primary hemostasis?

Answer 24

Becker-Cronkite method