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 A
Explanation
This is because glass ampules can leave small shards of glass in the solution, which can be harmful if injected into the client. A filter needle has a small mesh that traps any glass particles and prevents them from entering the syringe.
Choice B is wrong because the nurse should break the neck of the ampule away from the body to avoid injury from the glass.
Choice C is wrong because the nurse should use a different needle to inject the client after withdrawing the medication with a filter needle. This is to prevent contamination and reduce pain for the client.
Choice D is wrong because the nurse should dispose of the ampule in a sharps container, not in the trash can. This is to prevent injury and infection from the broken glass.
Correct Answer is B
Explanation
Advance directives are legal documents that allow a person to express their wishes for medical care in case they become incapacitated or unable to communicate. They do not require a lawyer or a notary to be valid, as long as they follow the state laws and are signed by the person and two witnesses.
Choice A is wrong because it implies that legal representation is necessary for advance directives, which is not true.
A social worker can help the client with other resources or support, but not with finding a lawyer for this purpose.
Choice C is wrong because it suggests that advance directives can be verbal, which is not true. Advance directives must be written and signed to be legally binding.
Verbal agreements may not be honored or remembered by the provider or the family.
Choice D is wrong because it implies that advance directives need legal review, which is not true. Advance directives are personal decisions that do not need to be approved by a lawyer or a court.
Legal review may be helpful in some cases, but it is not mandatory or essential.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today