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 C
Explanation
Dizziness is a manifestation of hypovolemia, which is a decrease in blood volume due to fluid loss. Hypovolemia can cause orthostatic hypotension, which is a drop in blood pressure when changing positions. This can lead to dizziness, lightheadedness, or fainting.
Choice A is wrong because it is not a sign of hypovolemia, but rather a possible cause of it. Epistaxis is a nosebleed that can result from trauma, infection, dryness, or coagulation disorders.
Choice B is wrong because it is not a specific sign of hypovolemia, but rather a nonspecific symptom that can have many causes. Headache can be associated with dehydration, but it can also be caused by stress, infection, inflammation, or other factors.
Choice D is wrong because it is not a sign of hypovolemia, but rather a sign of fluid volume excess.
Fluid volume excess is an increase in blood volume due to fluid retention or overload. Fluid volume excess can cause dyspnea, which is difficulty breathing or shortness of breath.
Normal ranges for blood pressure are 90/60 mm Hg to 120/80 mm Hg for adults. Normal ranges for heart rate are 60 to 100 beats per minute for adults.
Correct Answer is B
Explanation
The correct answer is b. “I can visit my nephew who has chickenpox 5 days after the sores have crusted.”
Choice A rationale:
- Statement:“I should take antibiotics when I have a virus.”
- Rationale:This statement is incorrect.Antibiotics are medications that fight bacteria,not viruses.Taking antibiotics when you have a virus will not help you get better and can actually lead to antibiotic resistance.
Choice B rationale:
- Statement:“I can visit my nephew who has chickenpox 5 days after the sores have crusted.”
- Rationale:This statement is correct.Chickenpox is a highly contagious virus that is spread through the air by coughing and sneezing.However,a person with chickenpox is no longer contagious once all of the sores have crusted over.This typically happens about 5 days after the rash first appears.
Choice C rationale:
- Statement:“I should wash my hands for 10 seconds with hot water after working in the garden.”
- Rationale:This statement is partially correct.Handwashing is an important way to prevent the spread of infection.However,the water does not need to be hot.Warm or cold water is just as effective.It is also important to wash your hands for at least 20 seconds,not 10 seconds.
Choice D rationale:
- Statement:“I can clean my cat’s litter box during my pregnancy.”
- Rationale:This statement is incorrect.Cat feces can contain a parasite called Toxoplasma gondii,which can cause a serious infection called toxoplasmosis.Toxoplasmosis can be harmful to a developing baby.It is best to avoid cleaning cat litter boxes during pregnancy.If you must clean the litter box,wear gloves and wash your hands thoroughly afterwards.
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