MIDTERM: Clot Retraction Time (lab) Flashcards
Tube that is graduated to 5ml and is used in CRV, Mc Farlene method
Conical centrifuge tube
Tightening of the fibrin clot
Clot retraction
Terms applied to shrinkage of the blood clot
Syneresis
The separation of the blood clot from the wall of the test tube is normally observed after _____? And is complete after?
1 hour and 2 hours, respectively
The clot is approximately how many percent of the original blood volume?
50%
The reduction of the coagulum in mass and fluid serum being expressed from the clot is due to what?
Action of platelet on the fibrin network
State the principle of clot retraction
Clot retraction is directly proportional to platelets and inversely proportional to the hematocrit and fibrinogen levels
TRUE OR FALSE:
When fibrinolysis is very active, the fibrin may dissolved longer as it is formed and clot retraction will not be impaired.
FALSE. Fibrin dissolves almost as quickly as it is formed when fibrinolysis is very active, resulting to impaired clot retraction
In clot retraction time, how many ml of venous blood do you place in a test tube?
5mL
Ideal measurement of a coiled wire In clot retraction test.
1 mm thick with a 3cm diameter coil
In clot retraction time, how long do you incubate the venous blood?
37 degrees Celsius for 1 hour
In clot retraction time, how long do you allow the attached clot to drain?
2 minutes
Describe the characteristics of a normal clot
Firm, difficult to break up with blunt instruments and difficult to flatten out
In clot retraction time, what do you read in the last step?
Volume of the fluid remaining in the tube
Normal value in clot retraction time
44-67%
