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
The correct answer is choice A. INR.
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.
Normal ranges:
- INR: 0.8-1.2
- Fibrinogen: 200-400 mg/dL
- aPTT: 25-35 seconds
- Platelet count: 150-450 x 10^9/L References:
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
The correct answer is choice B. The client should keep the medication in the original container.
Dabigatran is a blood thinner that is used to prevent strokes or blood clots in people with atrial fibrillation, a type of irregular heartbeat. Dabigatran is sensitive to moisture and can lose its potency if exposed to humidity or heat. Therefore, it is important to store it in the original bottle or blister package that has a desiccant (drying agent) in the cap or cover. The client should also close the cap tightly after each use and keep the bottle away from excessive moisture, heat, and cold.
Choice A is wrong because storing the medication in the refrigerator can expose it to moisture and cause it to break down. Choice C is wrong because crushing the medication and mixing it with applesauce can alter its absorption and effectiveness. Choice D is wrong because the medication can be used up to 60 days after opening the bottle as long as it is stored properly. The normal dose of dabigatran for stroke prevention in atrial fibrillation is 150 mg twice a day, unless the client has kidney problems or other factors that require a lower dose.
Correct Answer is B
Explanation
The correct answer is choice B. The nurse should sit in a chair next to the bed to place the client at ease. This position allows the nurse to maintain eye contact, show interest, and respect the client’s personal space. Sitting on the bed next to the client (choice A) is wrong because it invades the client’s privacy and comfort zone. Standing at the side of the bed (choice C) or at the foot of the bed (choice D) is wrong because it creates a power imbalance and may intimidate the client.
The nurse should also consider the client’s condition and preferences when choosing a position for the interview. For example, a client who is on bedrest may have difficulty hearing or seeing the nurse if they are too far away or at an awkward angle.
Therefore, the nurse should adjust their position accordingly and ask the client if they are comfortable with it.
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