Specimen Collection and Processing

Question 1

any contamination of the blood with tissue fluid leads to

Answer 1

incorrect results

Question 2

for routine coagulation procedures, the ___ system is adequate

Answer 2

vacutainer blood collection system

Question 3

if only coagulation tests are ordered, a plain tube should be filled with

Answer 3

2 to 3 ml of blood

Question 4

when obtaining a blood specimen for special coagulation procedures, a two syringe technique may be applied using?

Answer 4

plastic syringes

Question 5

are generally not used for coagulation

Answer 5

capillary specimens

Question 6

all test tubes used for coagulation studies should have a ____ surface

Answer 6

noncontact surface

Question 7

it is recommended to use ___ and not glass or soda lime

Answer 7

siliconized surface

Question 8

the anticoagulant of choice for coagulation studies is ____

Answer 8

0.109 M sodium citrate

Question 9

alternate for 0.109 sodium citrate, but is not the recommended concentration

Answer 9

0.129 M sodium citrate

Question 10

the ratio of blood to anticoagulant

Answer 10

9 parts blood to 1 part sodium citrate

Question 11

blood specimens with a high hematocrit will contain ___ in relation to the volume of blood in the tube

Answer 11

less plasma

Question 12

the coagulation specimen should be centrifuged within _ of obtaining the sample

Answer 12

1 hour

Question 13

it is desirable to complete testing within ___ hours depending on the specific procedure

Answer 13

2-4 hours

Question 14

all pipets, test tubes, and reaction cups which come in contact with test plasma should have a

Answer 14

noncontact surface

Question 15

the plasma specimen should be in a stoppered container, this prevents?

Answer 15

loss of CO2 and resultant pH change of plasma

Question 16

for coagulation procedures, specimen will be tested within 2 hours of collection may be kept at?

Answer 16

room temperature

Question 17

if there is a delay beyond 2 hours it is advisable to

Answer 17

keep specimen on ice

Question 18

exceptions for the rule (> hour kept on ice), should be maintained at room temp

Answer 18

specimens for prothrombin time, factor VII assay, and platelet function studies

Question 18

tested or frozen within 30 minutes of collection

Answer 18

plasma for euglobin clot lysis

Question 18

with the exception of platelet function studies, plasma for coagulation testing should be

Answer 18

platelet poor

Question 19

poor plasma platelet count

Answer 19

less than 15,000 ul

Question 19

will routinely produce acceptable platelet poor plasma

Answer 19

15 minutes at 2500 x g centrifugation

Question 20

• contains an aqueous solution within a sealed unit, available in various sizes
• alternative method to crushed ice

Answer 20

kryorack

Question 21

kyrorack when placed in a freezer temperatures (-18C) for 8 hours, it maintains a temperature of

Answer 21

less than 8c for 8 hours at room temp

Question 22

is indicative of a traumatic venipuncture

Answer 22

hemolyzed plasma