A 70-year-old male patient is being monitored for heart rhythm disturbances following the administration of diuretics. Which laboratory result is most indicative of a potassium imbalance?

Correct Answer: B

Rationale: The correct answer is B: Serum potassium 2.8 mEq/L. A low potassium level (hypokalemia) can result from diuretic use, leading to heart rhythm disturbances. Potassium is crucial for proper heart function. Choice A, serum sodium 135 mEq/L, is within normal range and not indicative of a potassium imbalance. Choice C, serum calcium 8.5 mg/dL, and choice D, serum phosphate 3.5 mg/dL, are not directly related to potassium imbalance. Monitoring serum potassium levels is vital in patients on diuretics to prevent potential complications.

Correct Answer: A

Rationale: Ideal body weight is the weight associated with optimal health, not a fixed standard or subjective feeling.

Correct Answer: B

Rationale: Protein-calorie malnutrition manifests as poor wound healing, apathy, and edema due to insufficient protein and energy.

Correct Answer: A

Rationale: Obesity is typically defined as 20% or more above ideal body weight.

Correct Answer: A

Rationale: Anthropometric measurements (e.g., skinfold thickness) indirectly assess protein and fat stores.