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 C
Explanation
Answer and explanation.
The correct answer is choice C, hypertension. Hypertension is a contraindication to living kidney donation because it can increase the risk of kidney disease and cardiovascular complications in the donor. Hypertension can also affect the quality and survival of the donated kidney in the recipient.
Therefore, a potential donor with uncontrolled or poorly controlled hypertension should not undergo nephrectomy.
Choice A, osteoarthritis, is not a contraindication to living kidney donation.
Osteoarthritis is a degenerative joint disease that does not affect the kidneys or the cardiovascular system.
It may cause pain and stiffness in the joints, but it can be managed with medications and physical therapy. A potential donor with osteoarthritis can donate a kidney if they have normal kidney function and no other medical problems.
Choice B, primary glaucoma, is not a contraindication to living kidney donation.
Primary glaucoma is a condition that causes increased pressure in the eye and can lead to vision loss if untreated.
It does not affect the kidneys or the cardiovascular system. A potential donor with primary glaucoma can donate a kidney if they have normal kidney function and no other medical problems.
Choice D, amputation, is not a contraindication to living kidney donation.
Amputation is the surgical removal of a limb or part of a limb due to injury, infection, or disease.
It does not affect the kidneys or the cardiovascular system. A potential donor with amputation can donate a kidney if they have normal kidney function and no other medical problems.
Normal ranges for blood pressure are less than 120/80 mmHg for systolic and diastolic pressure, respectively.
Normal ranges for kidney function are eGFR above 60 mL/min/1.73 m2 and albuminuria below 30 mg/g.
Correct Answer is B
Explanation
A hematoma is a collection of blood outside a blood vessel that can cause swelling, pain, and bruising. It can indicate bleeding from the artery where the catheter was inserted, which can be a serious complication of cardiac catheterization.
The nurse should notify the provider immediately if a hematoma is observed.
Choice A is wrong because heart rate 90/min is within the normal range for adults and does not indicate a complication.
Choice C is wrong because bounding pulses in the affected extremity are expected after cardiac catheterization, as they indicate good blood flow to the area.
Choice D is wrong because report of discomfort at the insertion site is common and usually mild after cardiac catheterization.
The nurse can provide pain relief as needed, but does not need to notify the provider unless the pain is severe or persistent.
Normal ranges for heart rate are 60-100 beats per minute for adults. Normal ranges for blood pressure are 120/80 mmHg or lower for systolic pressure and 80 mmHg or lower for diastolic pressure. Normal ranges for oxygen saturation are 95-100% for adults.
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