Exam 36: Hemostasis: Laboratory Testing and Instrumentation

A patient is admitted with prolonged epistaxis and prolonged bleeding from a recent tooth extraction.Initial screening workup reports prolonged APTT and BT,and abnormal aggregation on the PFA.Which of the following tests would not help define the disorder?

The anticoagulant of 3.2% sodium citrate is preferred over 3.8% because:

Each of the following is the purpose of the INR except:

Justify the need for a molecular marker test in the workup of a hemostatic problem.

In testing for thrombotic disorders,the ideal test would be:

Laboratory testing for von Willebrand factor contains variables that can result in difficulty in diagnosing the disease.Which of the following factors is identified as a variable that can contribute to this difficulty?

The platelet function analyzer standardized the bleeding time method by eliminating the variables of the method.Which of the following represents the variables of bleeding time?

The aPTT is the most common procedure used to monitor the unfractionated heparin therapy.Which of the reagents used in the test provides the activation of the formation of the fibrin clot?

A patient's laboratory coagulation test results in an immediate correction of the PT and aPTT after mixing studies and no correction after performing the PT and aPTT after a 2-hour incubation at 37°C.What is the possible deficiency or inhibitor?

Choose the correct statement regarding proper specimen collection for coagulation testing from the following choices:

Interpret the following results. -PT = 32 sec -APTT = 92 sec -TT = 20 sec. What is the most likely reason for these aberrant results?

A citrated blood sample is tested with the following results: -PT = 60.0 seconds -APTT = 100.0 seconds Pending further testing,the most probable reason for these results is not:

What effect does the administration of recombinant factor VIIa concentrate have on the PT levels?

A patient has prolonged PT and APTT.Which of the following tests would not be warranted to follow up these findings?

According to the International Society on Thrombosis (ISTH),the guidelines for diagnostic criteria for LA/aPL include the demonstration of which of the following?

List the tests that are commonly utilized in the workup of the following: a.von Willebrand's disease b.Hemophilia A c.Factor VIII inhibitor d.Bernard-Soulier syndrome e.TTP

Normal pooled plasma is used as the diluent in a mixing study because it:

Based on the following data,what is the patient's most likely factor deficiency? PT Prolonged APTT Normal TT Normal

Which of the following tests does not measure activation of the hemostatic mechanism using markers of fibrin formation and fibrinolysis?

Which of the following is needed to perform an activated partial thromboplastin time?