Hemostasis

Question 1

Errors that requires rejection

Answer 1

Short draw
Specimen clot
Visible hemolysis
Lipemia or icterus
Tourniquet app. >1 min
Specimen storage

Question 2

Whole blood volume _________ of require volume submit to rejection

Answer 2

<90%

Question 3

Short draw results to

Answer 3

PT and PTT falsely increased

Question 4

A small clot interferes with ______________

Answer 4

Hemostasis test interference

Question 5

Pink or Red plasma indicates ____________ of platelets and coagulation

Answer 5

In vitro activation

Question 6

Hemolysis interferes with _______________

Answer 6

Optical endpoint coagulometer results

Question 7

Lipemia or icterus interferes with ________

Answer 7

Chromogenic substrate methods

Question 8

Tourniquet more than 1 min elevates

Answer 8

Concentration of VWF and fibrinogen

Question 9

Tourniquet more than 1 min shorten

Answer 9

Platelet integrity

Question 10

Refrigerator temperature causes

Answer 10

Precipitation of large VWF multimers
Activation of coagulation F7 and platelets
Destruction platelet integrity

Question 11

Storage at >25 degC causes

Answer 11

Deterioration of F5 and F8

Question 12

PT with no UFH stability

Answer 12

24 hours

Question 13

PTT with no UFH stability

Answer 13

4 hr

Question 14

Factor assay and whole blood aggregometry stability

Answer 14

4 hr

Question 15

PTT for monitoring UFH

Answer 15

Separate for 1 hr, test within 4 hr

Question 16

PT when UFH is present

Answer 16

Test for 4 hr, separate within 1 hr

Question 17

Optical platelets aggregometry stability

Answer 17

Wait for 30 mins, test within 4 hrs

Question 18

Stability if stored in household freezer

Answer 18

2 weeks

Question 19

Temperature storage for about 6 months or indefinite

Answer 19

-70degC