Correct Answer: C

Rationale: The correct instruction is to take ferrous sulfate with orange juice to increase absorption because the vitamin C content in orange juice enhances iron absorption. Choice A is incorrect because ferrous sulfate should be taken with food to reduce gastrointestinal side effects. Choice B is incorrect because milk can decrease iron absorption. Choice D is incorrect because antacids can reduce the absorption of ferrous sulfate.

Correct Answer: D

Rationale: The correct answer is D. A low potassium level (3.1 mEq/L) can increase the risk of digoxin toxicity. Hypokalemia can potentiate the effects of digoxin on the heart, leading to serious dysrhythmias. Choices A, B, and C are within normal ranges and do not indicate a need to withhold digoxin.

Correct Answer: C

Rationale: The correct action to maintain a sterile field is to avoid reaching over it. This prevents contamination of the sterile environment by reducing the risk of unintentionally dropping microorganisms from non-sterile areas onto the sterile field. Opening sterile packages using the flap closest to your body first (choice A) is a good practice but not directly related to maintaining the sterile field. Donning sterile gloves before opening the sterile package (choice B) is crucial for maintaining sterility but not specific to maintaining the sterile field. Placing sterile items at least 2.5 cm (1 in) from the edge of the sterile field (choice D) is important to prevent accidental contamination, but it is not the primary action to maintain the sterile field.

Correct Answer: B

Rationale: Tingling in the lips and fingers is a classic sign of hypocalcemia, which can occur as a complication following a thyroidectomy due to inadvertent damage to the parathyroid glands that regulate calcium levels. Hypokalemia (Choice A) presents with muscle weakness and cardiac issues, not tingling. Hyponatremia (Choice C) typically manifests with confusion, seizures, and muscle cramps. Hyperglycemia (Choice D) is associated with increased thirst, frequent urination, and fatigue.

Correct Answer: A

Rationale: The correct answer is A: Increased respiratory rate. An increased respiratory rate suggests the client is having difficulty clearing secretions and may require suctioning. Oxygen saturation of 96% is within the normal range and indicates adequate oxygenation. Clear lung sounds suggest good air entry without the need for suctioning. A productive cough, although a symptom of pneumonia, does not directly indicate the need for suctioning.