The nurse is about to administer warfarin (Coumadin). Which of the following laboratory studies would be reviewed first?
Vitamin K level
Activated Partial Thromboplastin Time (aPTT) level
International Normalized Ratio (INR) level
Fibrinogen level
The Correct Answer is C
A. Vitamin K level is important for warfarin’s mechanism but is not routinely measured before administration.
B. aPTT monitors heparin therapy, not warfarin.
C. INR is the standardized test used to monitor warfarin’s anticoagulant effect and is the most important lab to check before giving warfarin.
D. Fibrinogen level assesses clotting factor but is not used to monitor warfarin therapy.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Serum bilirubin and calcium can be affected in pancreatitis but are not the primary diagnostic indicators.
B. Serum amylase and lipase are the primary enzymes used to diagnose acute pancreatitis. These enzymes are released by the pancreas, and their levels rise significantly in response to pancreatic inflammation. Lipase, in particular, is more specific to pancreatitis and remains elevated longer than amylase.
C. Creatinine and BUN assess kidney function and are not directly related to diagnosing pancreatitis.
D. Troponin and CK-MB are cardiac markers used to diagnose myocardial infarction, not pancreatitis.
Correct Answer is C
Explanation
A. Dependent positioning can increase the risk of venous pooling and thrombosis.
B. Doppler ultrasound may be used if there is a suspicion of thrombosis but is not a standard preventative intervention.
C. Early ambulation and leg exercises promote circulation and reduce the risk of deep vein thrombosis, which is increased by oral contraceptive use.
D. Stopping oral contraceptives pre- or postoperatively is a physician’s decision, not a nursing intervention.
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