Correct Answer: A

Rationale: The correct answer is A: 'Start each meal with a protein source.' Protein is crucial for healing and maintaining muscle mass after gastric bypass surgery, making it essential to include in each meal. Choice B is incorrect because immediately after surgery, the focus is typically on a low-fiber diet to aid in healing. Choice C is unrelated to the nutritional needs following gastric bypass surgery. Choice D is also incorrect as patients recovering from gastric bypass surgery may require more frequent, smaller meals to meet their nutritional needs.

Correct Answer: B

Rationale: The correct answer is B: Prothrombin time (PT). Amoxicillin can potentiate the effects of warfarin, increasing the risk of bleeding. Monitoring the prothrombin time (PT) is crucial in this situation to assess the client's clotting ability. Choices A, C, and D are incorrect because amoxicillin's interaction with warfarin does not directly impact serum potassium, serum sodium, or blood glucose levels.

Correct Answer: C

Rationale: The correct answer is C. There should be 2 cm of water in the water seal chamber of the chest tube system. A level of 1 cm may indicate a leak or compromised functionality that requires intervention. Choices A, B, and D are not findings that necessarily require immediate intervention. Tidaling with spontaneous respirations is an expected finding, the drainage collection chamber being 1/3 full is within normal limits, and a suction chamber pressure of -20 cm H2O indicates appropriate suction for chest drainage.

Correct Answer: B

Rationale: In chronic kidney disease, the kidneys have impaired ability to activate vitamin D, leading to decreased production of calcitriol. Calcitriol is essential for calcium absorption in the intestines. Therefore, hypocalcemia is a common finding in chronic kidney disease. Hypernatremia (increased sodium levels) is not typically associated with chronic kidney disease. Low potassium and low magnesium are possible electrolyte imbalances in chronic kidney disease, but they are not as directly related to the impaired activation of vitamin D as hypocalcemia.

Correct Answer: C

Rationale: Jaundice within the first 24 hours of life is considered pathological and may indicate hemolytic disease or another serious condition, requiring further investigation.