Timedora
Free Practice Quiz Question List

2 Warfarin Therapy Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Warfarin Therapy, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

Warfarin is an oral vitamin K antagonist used to prevent and treat thromboembolism. True or false?

  1. A

    True

  2. B

    False

02
Written response
1 point

Which enzyme does warfarin inhibit to reduce activation of vitamin K-dependent clotting factors?

03
Fill in the blank
1 point

Warfarin reduces activation of the vitamin K-dependent clotting factors .

04
Choose one
1 point

Why does warfarin’s full antithrombotic effect take several days to develop?

  1. A

    Warfarin must accumulate in the bloodstream for several days before it can bind to clotting factors.

  2. B

    Existing circulating clotting factors are not immediately removed.

  3. C

    The body must first produce extra vitamin K.

  4. D

    The INR test cannot detect warfarin’s effect during the first few days.

05
Choose one
1 point

Which laboratory measure guides warfarin dose adjustment?

  1. A

    Activated partial thromboplastin time (aPTT) alone

  2. B

    Platelet count

  3. C

    Prothrombin time expressed as the INR

  4. D

    Serum vitamin K concentration

06
Choose all
1 point

Which factors can affect an individual patient’s warfarin dose needs? Select all correct answers.

  1. A

    Age

  2. B

    Body weight

  3. C

    Other medicines

  4. D

    Comorbidities

  5. E

    Genetic variation in CYP2C9 or VKORC1

  6. F

    Eye color

  7. G

    Blood type

07
True or false
1 point

If a patient misses a warfarin dose, the patient should double the next day’s dose to make it up. True or false?

  1. A

    True

  2. B

    False

08
Choose one
1 point

A patient with venous thromboembolism has an INR goal of 2–3. Which statement best explains how this goal relates to warfarin treatment generally?

  1. A

    An INR goal of 2–3 is required for every person taking warfarin.

  2. B

    An INR goal of 2–3 is common for some conditions, but it is not universal.

  3. C

    INR goals apply only to people taking warfarin for atrial fibrillation.

  4. D

    A mechanical heart valve always means that INR monitoring is unnecessary.

09
Fill in the blank
1 point

For a person taking warfarin, the general dietary goal is a of vitamin K.

10
Written response
1 point

Besides congenital malformations, what fetal complication is identified as a possible harm from warfarin during pregnancy?

11
Open ended
1 point

A patient whose warfarin treatment has been stable starts an antibiotic and sharply increases their intake of leafy greens. What should the patient do, and why?

12
Choose all
1 point

Which measures are supported as part of the general approach to major, life-threatening warfarin-associated bleeding? Select all correct answers.

  1. A

    Stop warfarin.

  2. B

    Give intravenous vitamin K.

  3. C

    Continue warfarin while waiting for the bleeding to resolve.

  4. D

    Give four-factor prothrombin complex concentrate (4F-PCC).

  5. E

    Use plasma if 4F-PCC is unavailable.

  6. F

    Use oral vitamin K alone as a substitute for urgent clinical management.

13
Choose one
1 point

A patient taking warfarin has an INR of 6 and no clinically relevant bleeding. Which approach best matches the guidance described for this situation?

  1. A

    Immediately give vitamin K to every such patient.

  2. B

    Temporarily withhold warfarin rather than routinely adding vitamin K, with clinician assessment and follow-up.

  3. C

    Continue the usual warfarin dose and do not recheck the INR.

  4. D

    Give plasma as routine treatment despite the absence of bleeding.

14
True or false
1 point

For a pregnant patient with a mechanical heart valve, stopping warfarin can also pose serious risks. True or false?

  1. A

    True

  2. B

    False

15
Choose one
1 point

Which laboratory test is used to guide warfarin dose adjustment?

  1. A

    Activated partial thromboplastin time

  2. B

    Prothrombin time expressed as the INR

  3. C

    Platelet count

  4. D

    Serum creatinine

16
Written response
1 point

Name one gene whose genetic variation can affect warfarin dose needs. Enter the gene symbol.

17
Choose one
1 point

A patient taking warfarin misses a dose. Which instruction is supported by the guidance in the material?

  1. A

    Double the next dose

  2. B

    Take extra doses over the next two days

  3. C

    Do not double the next day's dose to make up for it

  4. D

    Stop warfarin permanently

18
Choose one
1 point

A patient on stable warfarin starts an antibiotic and sharply increases their intake of leafy greens. What should they do?

  1. A

    Promptly contact the anticoagulation clinician for advice about monitoring and possible dose changes

  2. B

    Stop warfarin and avoid all leafy greens

  3. C

    Double the warfarin dose to offset the greens

  4. D

    Wait until the next routine appointment without mentioning the changes

19
Choose one
1 point

Which statement about warfarin dosing in older adults is supported by the material?

  1. A

    Older adults are generally less sensitive and often need higher doses

  2. B

    Older adults may be more sensitive and often need lower doses

  3. C

    Age has no possible effect on dose needs

  4. D

    Older adults should stop INR monitoring

20
Written response
1 point

Warfarin reduces activation of several vitamin K-dependent clotting factors. Which two anticoagulant proteins does it also reduce?