Exam 36: Hemostasis: Laboratory Testing and Instrumentation

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:

A patient has a prolonged APTT with a normal PT. There were no errors in specimen collection. What does this mean for the patient?

A patient with a fibrinolytic deficiency would:

Calculate the INR using the following data: Patient PT = 14.8 sec; normal PT sec = 12.2 sec; ISI = 1.3.

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

If blood is collected through an indwelling catheter, care must be taken to:

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

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

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

Prothrombin time measures the clotting factors in the:

Which of the following tests is used to assess platelet function in vivo?

A patient was drawn for PT and PTT testing. The laboratory professional noticed that the packed cell volume appeared abnormally elevated. A CBC was also drawn with the coag and the hematocrit was 63%. A new Na Citrate tube was prepared to correct for the elevated hematocrit and a repeat coag sample was drawn. How much anticoagulant is needed for a 4.5ml draw?

A hemophilic A patient has a severe bleed and is being treated with Factor VIII concentrate. When testing his post infusion, the factor VIII level does not increase. The problem could be:

Using the chromogenic methodology, a coagulation protein's activity level is related to:

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

Siemens BCS coagulation analyzers use what method of optical clot detection?

A patient has severe liver disease. What test results would you expect?

Interpret the following results. • PT = 32 sec • APTT = 92 sec • TT = >100 sec. What is the most likely reason for these aberrant results?

The purpose of the photodetector in immunologic methods on coagulation analyzers is to:

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?