Correct Answer: A

Rationale: The correct answer is A: Hypokalemia. Patients on diuretics are at risk of developing hypokalemia due to increased potassium excretion by the kidneys. Hypokalemia can lead to serious consequences such as cardiac arrhythmias. Hyponatremia (choice B) is an imbalance of sodium levels and is not typically associated with diuretic use. Hyperkalemia (choice C) is the opposite condition where potassium levels are elevated and is less common in patients on diuretics. Hypercalcemia (choice D) is an excess of calcium in the blood and is not directly related to diuretic use. Therefore, monitoring for hypokalemia is crucial in patients taking diuretics.

Correct Answer: B

Rationale: Redness and warmth in the calf can indicate a deep vein thrombosis (DVT), which is a serious complication following hip replacement surgery. It is crucial to report this finding promptly for further evaluation and intervention. The other options, heart rates of 88/min and 96/min, are within normal limits for an adult and may not require immediate reporting. A urine output of 30 mL/hr is concerning for decreased kidney perfusion, but the priority in this case is the potential DVT due to its severe implications.

Correct Answer: C

Rationale: A urine output of 30 mL/hr is significantly low and indicates possible renal impairment or inadequate perfusion to the kidneys, which are critical for postoperative recovery. In this situation, decreased urine output could lead to fluid and electrolyte imbalances, affecting the client's overall condition. The nurse should report this finding promptly to the healthcare provider for further evaluation and intervention. Serosanguineous wound drainage is a normal finding in the early postoperative period and does not typically warrant immediate concern. A heart rate of 90/min is within the normal range and may be expected in a postoperative client due to the stress response. A temperature of 37.3°C (99.1°F) is slightly elevated but not a concerning finding in isolation postoperatively.

Correct Answer: C

Rationale: The correct intervention for a client with deep vein thrombosis (DVT) is to apply cold packs to the affected extremity. Cold packs help reduce swelling and pain by causing vasoconstriction. Massaging the affected extremity could dislodge a clot, leading to serious complications. Encouraging bed rest may increase the risk of clot propagation, while frequent ambulation is contraindicated as it can dislodge clots.

Correct Answer: B

Rationale: Glycosylated hemoglobin (HbA1c) is the most accurate test for long-term management of blood glucose levels in individuals with diabetes mellitus. HbA1c reflects average blood glucose levels over the past 2-3 months, providing valuable information on the effectiveness of treatment and disease control. Postprandial blood glucose, glucose tolerance test, and fasting blood glucose are essential for monitoring blood glucose levels at specific times but do not offer the same insight into long-term disease management as HbA1c.