NCLEX-RN Hematologic System
Pharmacology Exam Questions & Answers
| 20 Original Nursing MCQs with Rationales
| ATI & NGN Style Study Guide
Question 1
Clinical Scenario
A 68-year-old male patient is admitted to the medical-surgical unit
with a newly diagnosed deep vein thrombosis (DVT) in his left lower
extremity. The healthcare provider prescribes a continuous
intravenous infusion of unfractionated heparin. The patient has no
known drug allergies.
Question Stem
Which laboratory value should the nurse monitor to determine the
therapeutic effectiveness of this medication?
A. Prothrombin time (PT)
B. Activated partial thromboplastin time (aPTT)
C. International Normalized Ratio (INR)
D. Platelet count
,Correct Answer
Correct Answer: B. Activated partial thromboplastin time (aPTT)
Detailed Rationale
The correct answer is B. Activated partial thromboplastin time
(aPTT) is the standard laboratory value used to monitor the
therapeutic effectiveness of unfractionated heparin. The therapeutic
goal for aPTT is typically 1.5 to 2 times the control value (usually 60-
80 seconds), which ensures adequate anticoagulation without
excessive bleeding risk. Option A (Prothrombin time [PT]) and Option
C (International Normalized Ratio [INR]) are used to monitor
warfarin therapy, not heparin. Option D (Platelet count) is monitored
in patients receiving heparin to detect heparin-induced
thrombocytopenia (HIT), a serious adverse effect, but it does not
measure the therapeutic anticoagulant effect of the drug. Nursing
considerations include obtaining baseline aPTT and platelet counts
before initiating therapy, monitoring aPTT every 6 hours during dose
adjustments, and assessing the patient for signs of bleeding (e.g.,
hematuria, petechiae, bleeding gums). Protamine sulfate must be
readily available as the specific antidote for heparin overdose. This
question emphasizes the critical nursing responsibility of laboratory
monitoring to ensure medication safety and prevent hemorrhagic
complications in patients receiving high-alert anticoagulant therapy.
Learning Objective
• Identify the appropriate laboratory monitoring parameters for
unfractionated heparin.
• Differentiate between laboratory values used for heparin versus
warfarin therapy.
,• Recognize the signs of bleeding that require immediate
intervention during heparin therapy.
Medication Safety Focus
Monitoring
Question 2
Clinical Scenario
A 55-year-old female patient is being discharged home after
treatment for a pulmonary embolism. She is prescribed warfarin 5
mg orally once daily. The nurse is providing discharge education
regarding diet and lifestyle modifications.
Question Stem
Which statement by the client indicates an understanding of the
teaching?
A. "I will eat a consistent amount of green leafy vegetables each
week."
B. "I will take ibuprofen for any headaches or muscle aches I
develop."
C. "I will switch to a hard-bristled toothbrush to clean my teeth more
effectively."
D. "I will stop taking the medication for a few days if I notice my
gums bleeding."
Correct Answer
Correct Answer: A. "I will eat a consistent amount of green leafy
vegetables each week."
, Detailed Rationale
The correct answer is A. Warfarin is a vitamin K antagonist. While
patients do not need to avoid vitamin K-rich foods (like green leafy
vegetables), they must consume a consistent amount day-to-day to
prevent fluctuations in the INR. Sudden increases in vitamin K intake
can decrease warfarin's effectiveness, while sudden decreases can
increase bleeding risk. Option B is incorrect because NSAIDs like
ibuprofen increase the risk of gastrointestinal bleeding and should
be avoided; acetaminophen is the preferred analgesic. Option C is
incorrect because a soft-bristled toothbrush and electric razor
should be used to minimize trauma and bleeding risk. Option D is
incorrect because patients should never adjust or stop their
warfarin dose without explicit instructions from their healthcare
provider, as this can lead to life-threatening thrombosis. Nursing
considerations include emphasizing the importance of regular INR
monitoring, recognizing signs of bleeding, and informing all
healthcare providers (including dentists) about warfarin use. This
highlights the critical role of patient education in maintaining
therapeutic anticoagulation.
Learning Objective
• Explain the relationship between dietary vitamin K and warfarin
therapy.
• Identify safe over-the-counter medication alternatives for patients
on warfarin.
• Recognize inappropriate patient actions that require corrective
teaching regarding anticoagulant use.
Medication Safety Focus
Patient education
Pharmacology Exam Questions & Answers
| 20 Original Nursing MCQs with Rationales
| ATI & NGN Style Study Guide
Question 1
Clinical Scenario
A 68-year-old male patient is admitted to the medical-surgical unit
with a newly diagnosed deep vein thrombosis (DVT) in his left lower
extremity. The healthcare provider prescribes a continuous
intravenous infusion of unfractionated heparin. The patient has no
known drug allergies.
Question Stem
Which laboratory value should the nurse monitor to determine the
therapeutic effectiveness of this medication?
A. Prothrombin time (PT)
B. Activated partial thromboplastin time (aPTT)
C. International Normalized Ratio (INR)
D. Platelet count
,Correct Answer
Correct Answer: B. Activated partial thromboplastin time (aPTT)
Detailed Rationale
The correct answer is B. Activated partial thromboplastin time
(aPTT) is the standard laboratory value used to monitor the
therapeutic effectiveness of unfractionated heparin. The therapeutic
goal for aPTT is typically 1.5 to 2 times the control value (usually 60-
80 seconds), which ensures adequate anticoagulation without
excessive bleeding risk. Option A (Prothrombin time [PT]) and Option
C (International Normalized Ratio [INR]) are used to monitor
warfarin therapy, not heparin. Option D (Platelet count) is monitored
in patients receiving heparin to detect heparin-induced
thrombocytopenia (HIT), a serious adverse effect, but it does not
measure the therapeutic anticoagulant effect of the drug. Nursing
considerations include obtaining baseline aPTT and platelet counts
before initiating therapy, monitoring aPTT every 6 hours during dose
adjustments, and assessing the patient for signs of bleeding (e.g.,
hematuria, petechiae, bleeding gums). Protamine sulfate must be
readily available as the specific antidote for heparin overdose. This
question emphasizes the critical nursing responsibility of laboratory
monitoring to ensure medication safety and prevent hemorrhagic
complications in patients receiving high-alert anticoagulant therapy.
Learning Objective
• Identify the appropriate laboratory monitoring parameters for
unfractionated heparin.
• Differentiate between laboratory values used for heparin versus
warfarin therapy.
,• Recognize the signs of bleeding that require immediate
intervention during heparin therapy.
Medication Safety Focus
Monitoring
Question 2
Clinical Scenario
A 55-year-old female patient is being discharged home after
treatment for a pulmonary embolism. She is prescribed warfarin 5
mg orally once daily. The nurse is providing discharge education
regarding diet and lifestyle modifications.
Question Stem
Which statement by the client indicates an understanding of the
teaching?
A. "I will eat a consistent amount of green leafy vegetables each
week."
B. "I will take ibuprofen for any headaches or muscle aches I
develop."
C. "I will switch to a hard-bristled toothbrush to clean my teeth more
effectively."
D. "I will stop taking the medication for a few days if I notice my
gums bleeding."
Correct Answer
Correct Answer: A. "I will eat a consistent amount of green leafy
vegetables each week."
, Detailed Rationale
The correct answer is A. Warfarin is a vitamin K antagonist. While
patients do not need to avoid vitamin K-rich foods (like green leafy
vegetables), they must consume a consistent amount day-to-day to
prevent fluctuations in the INR. Sudden increases in vitamin K intake
can decrease warfarin's effectiveness, while sudden decreases can
increase bleeding risk. Option B is incorrect because NSAIDs like
ibuprofen increase the risk of gastrointestinal bleeding and should
be avoided; acetaminophen is the preferred analgesic. Option C is
incorrect because a soft-bristled toothbrush and electric razor
should be used to minimize trauma and bleeding risk. Option D is
incorrect because patients should never adjust or stop their
warfarin dose without explicit instructions from their healthcare
provider, as this can lead to life-threatening thrombosis. Nursing
considerations include emphasizing the importance of regular INR
monitoring, recognizing signs of bleeding, and informing all
healthcare providers (including dentists) about warfarin use. This
highlights the critical role of patient education in maintaining
therapeutic anticoagulation.
Learning Objective
• Explain the relationship between dietary vitamin K and warfarin
therapy.
• Identify safe over-the-counter medication alternatives for patients
on warfarin.
• Recognize inappropriate patient actions that require corrective
teaching regarding anticoagulant use.
Medication Safety Focus
Patient education
