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 will facilitate the insertion of the catheter and reduce the risk of complications such as infiltration, phlebitis, or hematoma. A straight vein will also allow the catheter to be inserted up to the hub, which reduces the risk of contamination along the length of the catheter.
Choice A is wrong because selecting a site on the client’s dominant arm can interfere with the client’s mobility and increase the risk of dislodging the catheter. The nurse should choose a site on the client’s non-dominant arm, preferably on the hand or forearm.
Choice B is wrong because applying a tourniquet below the venipuncture site will impede blood flow and make it harder to locate a suitable vein. The nurse should apply a tourniquet above the venipuncture site, about 10 to 15 cm from the insertion site.
Choice C is wrong because elevating the client’s arm prior to insertion will decrease venous filling and make it harder to palpate a vein. The nurse should lower the client’s arm below the level of the heart to increase venous distension.
Normal ranges for IV catheter size and insertion angle depend on several factors, such as the type and duration of therapy, the condition and size of the vein, and the age and preference of the client.
In general, smaller gauge catheters (20 to 24) are preferred for peripheral IV therapy, and larger gauge catheters (14 to 18) are used for rapid fluid administration or blood transfusion. The insertion angle can vary from 10 to 30 degrees, depending on the depth and location of the vein.
Correct Answer is C
Explanation
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 a 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.
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