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 D
Explanation
Choice A reason:
"I try to respond to the baby quickly so she doesn't cry very long." This statement is incorrect because it indicates the parent's sensitivity to the baby's needs and responsiveness to the baby's cues, which are positive signs of appropriate caregiving.
Choice B reason:
"I have several friends who come by to help out with the baby." This statement is incorrect because having a support system in the form of friends who help with the baby is a positive factor that can reduce stress and promote a healthy postpartum period.
Choice C reason:
"I want to meet other parents to see if they are going through the same things." This statement is incorrect because seeking social support and connecting with other parents can be beneficial in reducing feelings of isolation and stress during the postpartum period.
Choice D reason:
"I think the baby should be sleeping through the night by now is the correct statement "I think the baby should be sleeping through the night by now," as a manifestation of increased risk for child abuse. This statement may indicate unrealistic expectations or frustration from the parent regarding the baby's sleep patterns.
It is common for newborns to wake frequently during the night for feeding and care, and their sleep patterns can vary significantly in the early weeks and months of life. Unrealistic expectations or frustration about the baby's sleep habits can contribute to increased stress for the parent, which might increase the risk of child abuse or neglect.
Correct Answer is D
Explanation
The correct answer is choice D. Shuffling gait. This is because shuffling gait is a common manifestation of pseudoparkinsonism, which is a condition that mimics the symptoms of Parkinson’s disease due to the use of certain medications that block dopamine receptors, such as haloperidol. Pseudoparkinsonism can cause slowed movements, muscle stiffness, tremor, and postural instability.
Choice A. Nonreactive pupils is wrong because this is not a typical feature of pseudoparkinsonism or Parkinson’s disease.
Nonreactive pupils can be caused by other conditions, such as brain injury, drugs, or eye diseases.
Choice B. Serpentine limb movement is wrong because this is a characteristic of tardive dyskinesia, another drug-induced movement disorder that can result from long-term use of dopamine receptor blocking agents. Tardive dyskinesia causes involuntary movements of the face, tongue, and limbs that are often writhing or twisting.
Choice C. Smacking lips is wrong because this is also a sign of tardive dyskinesia, not pseudoparkinsonism. Smacking lips is one of the orofacial movements that can occur in tardive dyskinesia due to abnormal muscle contractions.
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