Question 1

What is the purpose of the International Normalized Ratio (INR) in coagulation studies?

Accepted Answer

To standardize prothrombin time results across different laboratories

Answer

To measure platelet count

Answer

To evaluate bleeding time

Answer

To assess activated partial thromboplastin time

Question 2

Which of the following INR values is generally considered therapeutic for patients on warfarin?

Accepted Answer

2.0 to 3.0

Answer

1.0 to 1.5

Answer

3.5 to 4.5

Answer

4.7 to 5.0

Question 3

What factor does the International Normalized Ratio (INR) primarily measure in the coagulation pathway?

Accepted Answer

Prothrombin

Answer

Factor XIII

Answer

Factor VIII

Answer

Fibrinogen

Question 4

What is the primary clinical significance of monitoring the International Normalized Ratio (INR) in patients?

Accepted Answer

To prevent thromboembolic complications

Answer

To assess liver function

Answer

To diagnose hemophilia

Answer

To measure blood oxygen levels

Question 5

Which of the following can significantly affect the International Normalized Ratio (INR) readings in patients taking warfarin?

Accepted Answer

Dietary vitamin K intake

Answer

Hydration status

Answer

Blood pressure medications

Answer

Age of the patient

Question 6

Which test is commonly used to calculate the International Normalized Ratio (INR)?

Accepted Answer

Prothrombin time (PT)

Answer

Complete blood count (CBC)

Answer

Activated partial thromboplastin time (aPTT)

Answer

Thrombin time (TT)

Question 7

In what clinical scenario is the International Normalized Ratio (INR) most commonly monitored?

Accepted Answer

Patients on anticoagulant therapy

Answer

Patients with high blood pressure

Answer

Patients undergoing liver function tests

Answer

Patients receiving chemotherapy

Question 8

What is the target INR range for patients with mechanical heart valves?

Accepted Answer

2.5 to 3.5

Answer

1.5 to 2.0

Answer

1.0 to 1.5

Answer

3.0 to 4.0

Question 9

What happens to the INR level when a patient takes antibiotics that affect gut flora?

Accepted Answer

It may increase due to decreased vitamin K absorption

Answer

It may fluctuate without any predictable pattern

Answer

It will remain unchanged

Answer

It will decrease due to increased clotting factors

Question 10

Why is the International Normalized Ratio (INR) important for patients undergoing surgical procedures?

Accepted Answer

To assess bleeding risk before surgery

Answer

To measure blood glucose levels

Answer

To evaluate liver enzyme levels

Answer

To determine blood type compatibility

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