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 A
Explanation
Choice A reason
The client is observed displaying a shuffling gait while walking in the hall is the correct answer. The nurse should recognize that observing a shuffling gait in a client who is taking antipsychotic medication is an adverse effect that must be reported to the healthcare provider. A shuffling gait is a movement disorder known as parkinsonism, which can be a side effect of some antipsychotic medications, particularly first-generation or typical antipsychotics.
Parkinsonism includes symptoms similar to Parkinson's disease, such as a shuffling walk, muscle stiffness, tremors, and difficulty with balance and coordination. It can occur as a result of blocking dopamine receptors in the brain, leading to an imbalance in dopamine levels.
Choice B reason:
The client mumbling quietly while alone is not correct because in the day room may be related to the symptoms of schizophrenia, and it does not indicate an adverse effect of the antipsychotic medication.
Choice C reason:
The client feeling light-headed when standing up quickly is not correct and it may be related to postural hypotension, which can be a side effect of some antipsychotic medications. While it should be monitored and reported if persistent or severe, it is not as urgent as reporting a shuffling gait.
Choice D reason:
The client stating that being in the sun hurts their eyes does not necessarily indicate an adverse effect of the antipsychotic medication. It may be related to other factors or unrelated to the medication.
Correct Answer is C
Explanation
The correct answer is Choice C.
Choice A rationale: While additional staff may be needed, the primary focus during a mass casualty event is triage and immediate care. Choice B rationale: Media relations are important, but the nurse's priority is direct patient care. Choice C rationale: Assessing incoming clients and determining their medical needs is crucial for prioritizing care and allocating resources effectively. Choice D rationale: Discharging stable clients may be necessary in extreme circumstances, but it is not the immediate priority. The focus should be on providing care to the influx of injured patients.
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