A nurse is reporting a client’s laboratory tests to the provider to obtain a prescription for the client’s daily warfarin.
Which of the following laboratory tests should the nurse plan to report to obtain the prescription for the warfarin?
INR.
Fibrinogen level.
aPTT.
Platelet count.
The Correct Answer is A
Warfarin is a vitamin K antagonist that inhibits the synthesis of factors II, VII, IX, and X in the liver. These factors are part of the extrinsic and common pathways of coagulation, which are measured by the prothrombin time (PT) and the international normalized ratio (INR). The INR is a standardized way of reporting the PT that accounts for the variability of different reagents and instruments. The INR is used to monitor the therapeutic effect of warfarin and to adjust the dose accordingly. The target INR range depends on the indication for warfarin, but it is usually between 2 and 3 for most conditions.
Choice B is wrong because fibrinogen level is not affected by warfarin.
Fibrinogen is a precursor of fibrin, which forms the final step of the coagulation cascade.
Fibrinogen level can be decreased in conditions such as disseminated intravascular coagulation (DIC), liver disease, or severe bleeding.
Choice C is wrong because aPTT is not affected by warfarin.
aPTT measures the intrinsic and common pathways of coagulation, which are mainly dependent on factors VIII, IX, XI, and XII.
These factors are not inhibited by warfarin.
aPTT is used to monitor the effect of heparin, a direct antithrombin agent that inhibits thrombin and factor Xa.
Choice D is wrong because platelet count is not affected by warfarin.
Platelets are cell fragments that adhere to damaged blood vessels and form aggregates to initiate hemostasis.
Platelet count can be decreased in conditions such as immune thrombocytopenia (ITP), heparin-induced thrombocytopenia (HIT), or bone marrow suppression.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
This is because the first priority for the nurse is to assess the cause of the vomiting and ensure that the NG tube is working properly. If the suction device is malfunctioning, it could lead to gastric distension, nausea and vomiting. The nurse should check the suction settings, tubing, canister and connections for any problems.
Choice A is wrong because replacing the NG tube is not the first action to take.
The nurse should first rule out other causes of vomiting before attempting to reinsert the tube, which could be uncomfortable and risky for the client.
Choice B is wrong because providing oral hygiene care is not the most urgent action to take.
While oral hygiene care is important for comfort and infection prevention, it does not address the underlying cause of vomiting or prevent further complications.
Choice C is wrong because administering an antiemetic medication is not the most appropriate action to take.
The nurse should first identify the cause of vomiting and correct it if possible.
Giving an antiemetic medication without resolving the problem could mask symptoms and delay treatment.
Correct Answer is A
Explanation
This client has a high risk of developing a pulmonary embolism, which is a life-threatening condition that requires immediate intervention. Tachypnea is a sign of respiratory distress and hypoxia, which can indicate a pulmonary embolism. The nurse should assess this client first and notify the provider.
Choice B is wrong because a client who has diabetes mellitus and an HbA1c of 6.8% is well- controlled and does not need urgent attention.
The normal range for HbA1c is 4% to 6%, and the goal for diabetic clients is less than 7%.
Choice C is wrong because a client who has epidural analgesia and weakness in the lower extremities is expected to have some degree of motor impairment due to the medication.
The nurse should monitor the client’s sensation, movement, and pain level, but this is not a priority over choice A.
Choice D is wrong because a client who has sinus arrhythmia and is receiving cardiac monitoring is not in immediate danger.
Sinus arrhythmia is a normal variation of heart rhythm that occurs with breathing.
The nurse should observe the client’s vital signs and cardiac rhythm, but this is not a priority over choice A.
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