A nurse is reviewing the laboratory results of a client who has been taking warfarin for 3 months. Which of the following laboratory results Indicates that the medication has been effective?
Hgb 14 g/dL
WBC count 10,000/mm3
INR 2.0
Platelets 150,000/mm3
The Correct Answer is C
A. Hemoglobin level: The hemoglobin level measures the amount of hemoglobin, the oxygen-carrying protein in red blood cells, in the blood. Warfarin is not directly responsible for increasing or decreasing the hemoglobin level. While warfarin can lead to bleeding complications in some cases, it does not specifically target the hemoglobin level, so it is not a direct indicator of the medication's effectiveness.
B. Platelet count: The platelet count measures the number of platelets in the blood, which are essential for blood clotting. Warfarin does not directly affect platelet production or count. It works by inhibiting the production of certain clotting factors, not by affecting platelets. Monitoring the platelet count is important, but it is not an indicator of warfarin's effectiveness in preventing excessive clotting.
C. Prothrombin time (PT) or activated partial thromboplastin time (aPTT): Prothrombin time (PT) and activated partial thromboplastin time (aPTT) are coagulation tests used to assess different types of anticoagulant medications, such as heparin. Warfarin's effect is measured using the International Normalized Ratio (INR). PT and aPTT are not specific to warfarin therapy and are not used to monitor its effectiveness. The INR is the appropriate laboratory test for assessing the efficacy of warfarin therapy.
D. International Normalized Ratio (INR): This is the correct answer. The International Normalized Ratio (INR) is the laboratory test used to monitor the effectiveness of warfarin therapy. The INR measures the time it takes for the blood to clot and reflects the anticoagulant effect of warfarin. A therapeutic INR within the target range (e.g., INR = 2.0 to 3.0 for most indications) indicates that warfarin has been effective in preventing excessive clotting and reducing the risk of complications associated with blood clots.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A nurse who is caring for a preschooler should question a prescription for tetracycline. Tetracycline is contraindicated in children under 8 years of age due to its potential to cause permanent discoloration and damage to developing teeth and bones. This adverse effect is known as tooth staining or dental hypoplasia.
Let's go through the other options:
A. Azithromycin: Azithromycin is an appropriate antibiotic for use in preschool-age children and is commonly prescribed for various bacterial infections. It does not pose the same risk of tooth staining as tetracycline, making it a safe option for this age group.
C. Cefuroxime: Cefuroxime is another antibiotic that is safe for use in preschoolers. It belongs to the cephalosporin class of antibiotics and is commonly prescribed for respiratory tract infections, skin infections, and other bacterial infections.
D. Gentamicin: While gentamicin is an effective antibiotic, its use in preschool-age children should be carefully monitored. Gentamicin can have potential ototoxic and nephrotoxic effects (damage to the inner ear and kidneys, respectively). However, its use is not strictly contraindicated in this age group, and it can be prescribed when necessary with appropriate monitoring.
Correct Answer is ["B","E"]
Explanation
The nurse should monitor the following laboratory tests to determine the effectiveness of epoetin alfa:
B. Hemoglobin: Epoetin alfa is a medication used to treat anemia by stimulating red blood cell production. Monitoring hemoglobin levels can help assess if the medication is effectively increasing red blood cell production and improving anemia.
E. Iron: Iron is essential for red blood cell production. Monitoring iron levels can help determine if the client has adequate iron stores to support the increased production of red blood cells stimulated by epoetin alfa.
The other options listed, A. Thyroid-stimulating hormone, C. Blood glucose, and D. Alanine aminotransferase, are not directly related to the effectiveness of epoetin alfa in treating anemia. Thyroid-stimulating hormone is related to thyroid function, blood glucose is related to blood sugar control, and alanine aminotransferase is related to liver function. While these tests may be important for monitoring the overall health of the client, they are not specific indicators of the effectiveness of epoetin alfa.
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