01
Choose one
1 point
Which laboratory test is used to adjust warfarin therapy?
Free Practice Quiz Question List
5 Laboratory Monitoring of Antithrombotic Therapy Online Quiz Questions
Use this free practice quiz with 20 questions to review 5 Laboratory Monitoring of Antithrombotic Therapy, test your knowledge, and prepare for your next test or exam.
20 questions
02
True or false
1 point
True or false: Most patients receiving standard low-molecular-weight heparin therapy need routine anti-Xa testing to adjust their dose.
- A
True
- B
False
03
Fill in the blank
1 point
A common target INR range for many warfarin indications is to , although the patient's prescribed target should be followed.
04
True or false
1 point
True or false: Routine PT/INR and aPTT tests measure the intended antiplatelet effect of aspirin and clopidogrel.
- A
True
- B
False
05
Choose one
1 point
A patient taking rivaroxaban has a prolonged PT. Can the INR be used to determine the intensity of treatment?
- A
Yes. INR standardizes the PT result for rivaroxaban just as it does for warfarin.
- B
Yes, if the PT is prolonged, the INR gives a reliable estimate of treatment intensity.
- C
No. INR is not a standardized measure of rivaroxaban intensity.
- D
No. A prolonged PT proves that the patient has excessive anticoagulation.
06
Written response
1 point
For unfractionated heparin, what assay may be preferred when a baseline abnormality or lupus anticoagulant makes aPTT unreliable?
07
Choose one
1 point
A patient taking apixaban has normal PT/INR and aPTT results. Does this prove there is no clinically relevant drug effect?
- A
Yes. Normal results prove that apixaban has no clinically relevant effect.
- B
No. Normal results do not reliably rule out a clinically relevant apixaban level.
- C
Yes, provided both tests are normal.
- D
No. These results prove that the patient has excessive apixaban activity.
08
Written response
1 point
Which assay is highly sensitive to dabigatran, so a normal result can help exclude a clinically relevant drug effect?
09
Choose all
1 point
A patient receiving intravenous unfractionated heparin has an unexpectedly prolonged aPTT. Which actions or checks should be considered before changing the dose? Select all that apply.
- A
Check the institutional heparin protocol and therapeutic range.
- B
Assume that any prolonged aPTT always means the dose must be reduced immediately.
- C
Review specimen collection and timing.
- D
Consider whether aPTT is reliable for this patient.
10
Choose all
1 point
Besides the anticoagulation assay, which findings are important to follow during heparin treatment? Select all that apply.
- A
Follow the platelet count.
- B
Follow hemoglobin and hematocrit.
- C
Use a single platelet value alone to determine whether HIT is present.
- D
Investigate evidence of blood loss.
11
Fill in the blank
1 point
When interpreting an anticoagulant test result alongside the medication, dose, and timing of the last dose, also consider function.
12
Choose one
1 point
A patient taking dabigatran has a prolonged thrombin time. What can that result alone establish about the amount of clinically important drug remaining?
- A
It proves that no dabigatran remains.
- B
It directly quantifies the amount of clinically important dabigatran.
- C
It does not, by itself, quantify how much clinically important dabigatran remains.
- D
It gives a standardized measure of dabigatran intensity equivalent to INR for warfarin.
13
Open ended
1 point
A patient taking an anticoagulant reports black stools and new dizziness, although the most recent coagulation test was normal. Explain how this should be interpreted and outline the immediate assessment priorities.
14
Choose one
1 point
What does a high INR generally indicate in a patient taking warfarin?
- A
A high INR generally indicates increased anticoagulant effect and bleeding risk.
- B
A high INR generally indicates inadequate protection from clotting.
- C
A low INR generally indicates increased anticoagulant effect and bleeding risk.
- D
The same INR target applies to every patient taking warfarin.
15
Choose one
1 point
Which statement about using the aPTT to assess low-molecular-weight heparin effect is correct?
- A
The aPTT is the standard measure of low-molecular-weight heparin effect.
- B
The aPTT is not a suitable measure of low-molecular-weight heparin effect.
- C
PT/INR is required to measure low-molecular-weight heparin effect.
- D
Thrombin time is required for routine monitoring of low-molecular-weight heparin.
16
Choose one
1 point
Which statement best describes the role of platelet-function testing for patients taking aspirin or clopidogrel?
- A
Platelet-function testing is required for every patient taking aspirin or clopidogrel.
- B
Platelet-function testing routinely determines the appropriate dose for these drugs.
- C
Platelet-function testing is reserved for selected clinical situations and does not routinely guide treatment.
- D
Platelet-function testing replaces assessment for bleeding or thrombosis.
17
True or false
1 point
True or false: A normal result on a routine clotting test reliably excludes the effect of every anticoagulant.
- A
True
- B
False
18
Choose one
1 point
When laboratory assessment of dabigatran effect is clinically necessary, which testing approach can measure the effect?
- A
A dilute thrombin time or an ecarin-based assay
- B
PT/INR alone
- C
Platelet count alone
- D
A routine aPTT as a precise measure of the drug level
19
Written response
1 point
What prothrombotic adverse reaction should be considered when a patient has a substantial platelet fall during heparin exposure?
20
Written response
1 point
If a drug level is needed for a patient taking rivaroxaban, which assay should be used when available?
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