Hematology Exam 6 UPDATED Exam
ACTUAL Questions and CORRECT
Answers
What is the Ratio of anticoagulant to blood? - CORRECT ANSWER - 1:9
What is the Ratio of anticoagulant? - CORRECT ANSWER - .5 ml NA citrate
What is the Ratio of blood? - CORRECT ANSWER - 4.5 ml
What disrupts the coagulation cascade and prevents clotting by binding to the calcium in the
blood? - CORRECT ANSWER - Na citrate
How does Na citrate prevents clotting? - CORRECT ANSWER - by binding to the
calcium in the blood
In Na citrate, how will there be no regulation of the binding and the cascade cannot begin? -
CORRECT ANSWER - by reducing the amt of Ca
What inhibits clotting by forming complex with antithrombin III? - CORRECT
ANSWER - Heparin
What complex does Heparin form? - CORRECT ANSWER - antithrombin III
In specimen collection, why is it important to keep tubes capped and upright? - CORRECT
ANSWER - maintains pH
What kind of glass tubes should you use for Hemostasis specimen Collection? - CORRECT
ANSWER - •Plastic or silicone coated glass tubes
, If you was to use Plain glass tubes for Hemostasis specimen Collection what would take place? -
CORRECT ANSWER - -Plain glass activates intrinsic pathway & contact factors
prekallikrein, XI, & XII
When performing the order of draw what should you do before collecting in an anticoagulant
tube? And why? - CORRECT ANSWER - -Collect a plain red top with no anticoagulant
before an anticoagulant tube to decrease the risk of the blood clotting
During Coag what should you do to Catheters? - CORRECT ANSWER - •flush line with
saline, discard 1st 5 ml.
QNS stands for? - CORRECT ANSWER - quantity not sufficient
A short draw is when what? - CORRECT ANSWER - specimen is less than 90%
All tubes must be what? - CORRECT ANSWER - 90% full
If specimen is less than 90% full what should you do? - CORRECT ANSWER - reject and
redraw
What causes a false increase (prolonged) PT and PTT? - CORRECT ANSWER - short
draw
not mix specimen (bld clots)
When dealing with short draw excess anticoagulant binds to what? - CORRECT
ANSWER - Ca++
What causes a false increase (prolonged) PT and PTT? - CORRECT ANSWER - -not mix
specimen (bld clots)
ACTUAL Questions and CORRECT
Answers
What is the Ratio of anticoagulant to blood? - CORRECT ANSWER - 1:9
What is the Ratio of anticoagulant? - CORRECT ANSWER - .5 ml NA citrate
What is the Ratio of blood? - CORRECT ANSWER - 4.5 ml
What disrupts the coagulation cascade and prevents clotting by binding to the calcium in the
blood? - CORRECT ANSWER - Na citrate
How does Na citrate prevents clotting? - CORRECT ANSWER - by binding to the
calcium in the blood
In Na citrate, how will there be no regulation of the binding and the cascade cannot begin? -
CORRECT ANSWER - by reducing the amt of Ca
What inhibits clotting by forming complex with antithrombin III? - CORRECT
ANSWER - Heparin
What complex does Heparin form? - CORRECT ANSWER - antithrombin III
In specimen collection, why is it important to keep tubes capped and upright? - CORRECT
ANSWER - maintains pH
What kind of glass tubes should you use for Hemostasis specimen Collection? - CORRECT
ANSWER - •Plastic or silicone coated glass tubes
, If you was to use Plain glass tubes for Hemostasis specimen Collection what would take place? -
CORRECT ANSWER - -Plain glass activates intrinsic pathway & contact factors
prekallikrein, XI, & XII
When performing the order of draw what should you do before collecting in an anticoagulant
tube? And why? - CORRECT ANSWER - -Collect a plain red top with no anticoagulant
before an anticoagulant tube to decrease the risk of the blood clotting
During Coag what should you do to Catheters? - CORRECT ANSWER - •flush line with
saline, discard 1st 5 ml.
QNS stands for? - CORRECT ANSWER - quantity not sufficient
A short draw is when what? - CORRECT ANSWER - specimen is less than 90%
All tubes must be what? - CORRECT ANSWER - 90% full
If specimen is less than 90% full what should you do? - CORRECT ANSWER - reject and
redraw
What causes a false increase (prolonged) PT and PTT? - CORRECT ANSWER - short
draw
not mix specimen (bld clots)
When dealing with short draw excess anticoagulant binds to what? - CORRECT
ANSWER - Ca++
What causes a false increase (prolonged) PT and PTT? - CORRECT ANSWER - -not mix
specimen (bld clots)
