Correct Answer: B

Rationale: A GFR of 40 mL/min indicates a reduced glomerular filtration rate. In a healthy adult, the normal GFR ranges between 100 and 120 mL/min. A GFR of 40 mL/min signifies a significant reduction, leading to fluid retention and risks for hypertension and pulmonary edema due to excess vascular fluid. Choices A, C, and D are incorrect. Choice A is incorrect as a GFR of 40 mL/min is not excessive but rather reduced. Choices C and D do not directly address the interpretation of GFR but instead describe potential consequences of a reduced GFR.

Correct Answer: D

Rationale: The correct answer is D: Nausea and vomiting. Ondansetron is an antiemetic used to manage postoperative nausea and vomiting, as well as nausea and vomiting related to chemotherapy. It is not indicated for treating paralytic ileus, incisional pain, or urine retention. Paralytic ileus is a condition of the gastrointestinal tract characterized by the paralysis of intestinal muscles, which would not be treated with ondansetron. Incisional pain is typically managed with analgesics, not antiemetics. Urine retention is a urinary issue that does not involve nausea and vomiting, making ondansetron an inappropriate choice for this condition.

Correct Answer: A

Rationale: When a patient is receiving high doses of a cephalosporin, such as cefazolin, the nurse should closely monitor laboratory values that indicate renal and hepatic function. This includes checking the Blood Urea Nitrogen (BUN) and serum creatinine levels to assess kidney function. Additionally, monitoring liver function tests, such as AST, ALT, ALP, LDH, and bilirubin, is essential as cephalosporins can affect liver enzymes. Therefore, options B, C, and D are incorrect as they do not specifically address the parameters that are most pertinent when administering high doses of cephalosporins.

Correct Answer: A

Rationale: The correct answer is 'Metabolic acidosis.' Metabolic acidosis is characterized by a low pH (<7.35) and a low bicarbonate level (HCO3 <22 mEq/L). In this case, the client's ABG results show a pH of 7.25 and an HCO3 level of 14 mEq/L, indicating metabolic acidosis. The PCO2 of 34 mm Hg is normal, ruling out respiratory acidosis or alkalosis. The PO2 of 86 mm Hg is also within the normal range and is not indicative of a respiratory problem. Therefore, the client is experiencing metabolic acidosis based on the ABG results provided.

Correct Answer: C

Rationale: When an ELISA test for HIV is positive, it is essential to confirm the result with a Western blot. The Western blot is the confirmatory test for HIV. Choice A is incorrect because a positive ELISA test does not confirm HIV infection. Choice B is incorrect as it assumes a different diagnosis. Choice D is incorrect because a positive ELISA test does indicate potential HIV infection and requires confirmation.