Correct Answer: C

Rationale: The correct answer is C: 'Lowered immune system function.' As individuals age, their immune system tends to weaken, making them more susceptible to infections. Choices A, B, and D are incorrect because improved circulation and increased immune function would typically reduce the risk of infections, while dehydration can impact overall health but is not directly related to immune system function in the context of infection risk.

Correct Answer: C

Rationale: The correct answer is C: 'Lowered immune system function.' As individuals age, their immune system tends to weaken, making them more susceptible to infections. Choices A, B, and D are incorrect because improved circulation and increased immune function would typically reduce the risk of infections, while dehydration can impact overall health but is not directly related to immune system function in the context of infection risk.

Correct Answer: C

Rationale: The correct adverse effect associated with vancomycin therapy is an infusion reaction, known as Red Man Syndrome. This reaction presents with rashes, flushing, tachycardia, and hypotension. It is essential to administer vancomycin over at least 60 minutes to prevent these symptoms. Hepatotoxicity, constipation, and immunosuppression are not commonly associated with vancomycin use. Ototoxicity and renal toxicity are significant risks with prolonged vancomycin therapy.

Correct Answer: B

Rationale: The correct answer is B: Serum creatinine. Vancomycin is known to be nephrotoxic, meaning it can cause kidney damage. Monitoring serum creatinine levels is essential to assess kidney function and detect any signs of nephrotoxicity. Blood glucose levels (choice A) are not directly affected by vancomycin. INR levels (choice C) are typically monitored for clients on anticoagulants, not vancomycin. Liver function tests (choice D) are not primarily affected by vancomycin use; kidney function is of greater concern.

Correct Answer: A

Rationale: A TPN solution with an oily appearance and a layer of fat on top indicates that the solution is 'cracked' and should not be used as it may have separated or deteriorated. This finding suggests a need to obtain a new bag of TPN before administering. Options B, C, and D are normal aspects of TPN administration. Option B confirms the presence of essential components in the TPN solution, option C provides information about the preparation time, and option D ensures proper identification and matching of the TPN with the correct client.