Correct Answer: B

Rationale: The correct answer is B: 'This test is used to detect neural tube defects.' An alpha-fetoprotein test is essential for screening neural tube defects in the fetus, not for confirming pregnancy, determining lung maturity, or checking for gestational diabetes. Detecting neural tube defects is crucial for early intervention and management of potential health issues in the baby.

Correct Answer: B

Rationale: The correct answer is B: 'Monitor the client's weight daily.' In clients with heart failure on fluid restriction, monitoring daily weight is crucial to track fluid balance. This allows healthcare providers to assess if the client is retaining excess fluid, a common issue in heart failure. Choices A, C, and D are incorrect. Encouraging the client to drink more water contradicts the fluid restriction; avoiding drinking water after 6 PM is not specific to managing fluid restriction; and monitoring fluid intake only during meals does not provide a comprehensive assessment of fluid balance throughout the day.

Correct Answer: A

Rationale: The correct answer is A: Excessive thirst and fruity breath odor. Diabetic ketoacidosis presents with these early signs due to ketone buildup in the body. Choice B, weight loss and increased urination, are more characteristic of uncontrolled diabetes but not specific to diabetic ketoacidosis. Choice C, nausea and vomiting, can occur in diabetic ketoacidosis but are not as early or specific as excessive thirst and fruity breath odor. Choice D, hypoglycemia and fatigue, are not typical signs of diabetic ketoacidosis; rather, diabetic ketoacidosis usually presents with hyperglycemia.

Correct Answer: C

Rationale: When caring for a client diagnosed with delirium, the most important condition for the nurse to investigate is prescription drug intoxication. Delirium in older adults is commonly caused by medication side effects or interactions. Investigating prescription drug intoxication is crucial as it can be a reversible cause of delirium. While cancer, impaired hearing, and heart failure are important considerations in overall care, prescription drug intoxication takes precedence in cases of delirium.

Correct Answer: C

Rationale: The correct solution to maintain fluid and electrolyte balance during NG tube irrigation is 0.9% sodium chloride. This solution is isotonic and helps prevent electrolyte imbalances. Using tap water or sterile water can lead to electrolyte disturbances due to their hypotonic nature, while 0.45% sodium chloride is hypotonic and may cause further imbalances in the client's electrolyte levels.