18 Questions
What is the normal range for clot retraction?
48-64%
What is the computation formula for platelet estimate?
Cells/uL = Average no.of platelets x 20,000
Which method of determining clotting time has less contamination of plasma with tissue fluids?
Sabraze's Coagulation time using capillary tubes
What is the objective of Platelet Estimate mentioned in the text?
Platelet count determination
Which temperature is mentioned for placing the tube in the water bath during clotting?
37°C
What is the average volume of serum expressed as a percentage of the original volume of whole blood after clotting?
55%
Which component is bound by sodium citrate in the whole blood to prevent anticoagulation?
Calcium
What is the first step in the capillary method of clotting time?
Disinfect the area of puncture
What is the normal capillary clotting time in the slide or drop method?
2-4 minutes
In the capillary method of clotting time, when should the timer be started?
As soon as the second drop of blood appears
Which method uses a clean slide and is considered the simplest among all clotting time methods?
Slide or Drop Method
What does the plasma contain after centrifugation in Prothrombin Time (PT) - Quick Method?
Intrinsic coagulation factors except calcium and platelets
Which pathway of hemostasis does the prothrombin time (PT) evaluate?
Extrinsic and common pathways
What is the purpose of adding calcium, phospholipids, and an activator to plasma in the clotting process?
To activate factor VII
What initiates the activation of factor VII in the clotting process?
Tissue extract (Factors III)
Which test is used as a means for measuring the effect of anticoagulants, especially coumarin?
Prothrombin time (PT)
What converts fibrinogen into fibrin during the clotting process?
Activated thrombin
Which factors is the PT test dependent upon for monitoring anticoagulant therapy?
I, II, V, VII, and X
Learn the step-by-step procedure for determining blood clotting time using the slide or drop method, including disinfecting the area, puncturing to a specific depth, and observing fibrin strands. Test your knowledge on this important laboratory technique.
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