Correct Answer: B

Rationale: Correct Answer: The healthcare professional should review serum creatinine levels before administering metformin to assess kidney function. Metformin is excreted by the kidneys, and checking serum creatinine helps prevent lactic acidosis, a potential side effect in individuals with impaired renal function. Choice A: Potassium levels are not directly related to the administration of metformin. While monitoring potassium levels is important for some medications, it is not the priority when initiating metformin. Choice C: Sodium levels are not typically assessed specifically before starting metformin. It is not a routine lab test required prior to metformin administration. Choice D: Hemoglobin A1C reflects long-term blood sugar control and is not a lab test that needs to be reviewed before initiating metformin. It is used to monitor diabetes management over time, not for immediate medication administration considerations.

Correct Answer: C

Rationale: Obtaining arterial blood gases is a crucial nursing action when caring for a client with an arterial line. This procedure helps assess the client's oxygenation status and acid-base balance accurately. Leveling the transducer with the client's phlebotomy site (A) is important for accurate pressure measurements, but it is not the primary action in this scenario. Flushing the arterial line every 8 hours (B) is a routine maintenance procedure and not the immediate priority. Keeping the client's hand elevated above the heart level (D) is a good practice to prevent swelling, but it is not directly related to the arterial line care in this case.

Correct Answer: B

Rationale: The correct intervention for a client with nonblanchable erythema over the ischium is to teach the client to shift his weight every 15 minutes while sitting. This action helps relieve pressure on the affected area and prevents further skin breakdown. Placing the client upright on a donut-shaped cushion (Choice A) may not address the need for frequent weight shifts. Turning and repositioning the client every 3 hours (Choice C) is important for overall skin health but may not provide adequate relief for the specific area of nonblanchable erythema. Assessing pressure points every 24 hours (Choice D) is not frequent enough to prevent worsening of the skin condition in this case.

Correct Answer: A

Rationale: The correct action for the nurse to take when a client with a history of angina reports chest pain is to administer sublingual nitroglycerin every 5 minutes. Nitroglycerin helps dilate blood vessels, improving blood flow to the heart and relieving chest pain associated with angina. Aspirin is often given during a suspected heart attack, not for immediate relief of angina. Deep breathing exercises may be beneficial for anxiety or respiratory conditions but are not the first-line intervention for angina. Oxygen therapy is not the initial treatment for angina unless the client is hypoxic.

Correct Answer: A

Rationale: The correct answer is A. Weight gain can indicate myxedema, which is a symptom commonly seen in hypothyroidism. Exophthalmos (choice B) is actually a characteristic finding of hyperthyroidism, not hypothyroidism. Tachycardia (choice C) and heat intolerance (choice D) are also more indicative of hyperthyroidism rather than hypothyroidism.