which lab value is critical for patients on warfarin therapy

ATI RN

ATI RN Exit Exam Test Bank

1. Which lab value is critical for patients on warfarin therapy?

A. Monitor INR
B. Monitor potassium levels
C. Monitor sodium levels
D. Monitor platelet count

Correct answer: A

Rationale: The correct answer is to monitor INR levels for patients on warfarin therapy. INR monitoring is essential because it helps assess the clotting tendency of the blood and ensures that patients are within the therapeutic range to prevent both blood clots and excessive bleeding. Monitoring potassium levels (Choice B), sodium levels (Choice C), or platelet count (Choice D) is not specifically required for patients on warfarin therapy and does not directly impact the effectiveness or safety of the medication.

2. What is the primary purpose of administering an antiemetic?

A. To reduce nausea and vomiting
B. To increase appetite
C. To treat nausea caused by chemotherapy
D. To treat allergic reactions

Correct answer: A

Rationale: The correct answer is A: 'To reduce nausea and vomiting.' Antiemetics are medications used to prevent or alleviate nausea and vomiting. While they may indirectly help with appetite by reducing the unpleasant symptoms that can lead to decreased food intake, their primary purpose is not to increase appetite (Choice B). Choice C, 'To treat nausea caused by chemotherapy,' is partly correct as antiemetics are commonly used to manage chemotherapy-induced nausea, but this is not their exclusive purpose. Choice D, 'To treat allergic reactions,' is incorrect as antiemetics are not primarily used for treating allergic reactions.

3. A client is receiving warfarin for atrial fibrillation. Which of the following laboratory tests should the nurse expect to be ordered to monitor the effect of warfarin?

A. Platelet count
B. International normalized ratio (INR)
C. Prothrombin time (PT)
D. Partial thromboplastin time (PTT)

Correct answer: B

Rationale: The correct answer is B: International normalized ratio (INR). When a client is on warfarin therapy, the INR is monitored regularly to assess the anticoagulant effects of the medication. A therapeutic INR range for most indications is between 2.0 to 3.0. Choices A, C, and D are not typically used to monitor the effect of warfarin. Platelet count assesses the number of platelets in the blood, PT measures the clotting time of plasma, and PTT evaluates the intrinsic pathway of coagulation.

4. A nurse is preparing to administer insulin glargine to a client who has diabetes mellitus. Which of the following actions should the nurse take?

A. Administer the insulin via IV push.
B. Rotate injection sites to prevent tissue damage.
C. Mix the insulin with regular insulin before administering it.
D. Administer the insulin at the same time each day.

Correct answer: D

Rationale: Corrected Rationale: The correct action for the nurse to take when administering insulin glargine is to give it at the same time each day. This consistent timing helps maintain stable blood glucose levels. Choice A is incorrect because insulin glargine should not be administered via IV push. Choice B is incorrect as rotating injection sites is typically done for short-acting insulins to prevent lipodystrophy, not for insulin glargine. Choice C is incorrect as insulin glargine should not be mixed with other insulins before administration.

5. A nurse is providing teaching about immunizations to a client who is pregnant. The nurse should inform the client that she can receive which of the following immunizations during pregnancy?

A. Varicella vaccine.
B. Inactivated polio vaccine.
C. Tetanus diphtheria and acellular pertussis vaccine.
D. Inactivated influenza vaccine.

Correct answer: C

Rationale: The correct answer is C: Tetanus diphtheria and acellular pertussis (Tdap) vaccine. The Tdap vaccine can be safely administered during pregnancy to protect both the mother and the newborn against whooping cough. Choices A, B, and D are incorrect because the Varicella vaccine, Inactivated polio vaccine, and Inactivated influenza vaccine are generally not recommended during pregnancy due to safety concerns.