Correct Answer: B

Rationale: The correct answer is B: 'Take the medication on an empty stomach.' Levothyroxine should be taken on an empty stomach to enhance absorption and effectiveness. The medication is typically taken in the morning before breakfast. Choice A is incorrect because taking levothyroxine with a full meal can decrease its absorption. Choice C is incorrect because bedtime dosing may lead to insomnia. Choice D is incorrect because levothyroxine is a daily medication for hypothyroidism, not to be taken as needed for symptoms.

Correct Answer: B

Rationale: The activated partial thromboplastin time (aPTT) is the most accurate measure of heparin's therapeutic effect. Heparin increases the time it takes for blood to clot, and the aPTT helps determine whether the dose is within the desired range for anticoagulation therapy. Monitoring the INR, hemoglobin, or platelet count is not specific to assessing therapeutic heparin levels and may not reflect the anticoagulant effect of heparin.

Correct Answer: D

Rationale: The correct intervention for a 5-week-old infant with hypertrophic pyloric stenosis presenting with projectile vomiting is to maintain intravenous fluid therapy. This is essential to maintain hydration before surgery. Instructing the mother to give sugar water only (Choice A) is inadequate and does not address the need for proper hydration. Offering oral rehydration every 2 hours (Choice B) may not be effective in cases of severe vomiting and could lead to further fluid loss. Providing Pedialyte feedings via nasogastric tube (Choice C) is an option, but in severe cases, intravenous fluid therapy is more effective in ensuring hydration and electrolyte balance.

Correct Answer: D

Rationale: The client is likely experiencing spinal fluid leakage (post-lumbar puncture headache), a common complication of a lumbar puncture. This leakage results in a reduction of cerebrospinal fluid volume around the brain and spinal cord, leading to a headache that worsens when in an upright position due to reduced buoyancy. A migraine headache (Choice A) is not typically associated with a lumbar puncture. Infection from the puncture site (Choice B) would present with localized signs of inflammation, such as redness, swelling, and warmth, rather than worsening headache. Low blood sugar (Choice C) is not a common complication of lumbar puncture and would not typically manifest as a worsening headache when sitting up.

Correct Answer: C

Rationale: Daily weight is the most reliable indicator of fluid volume status as it reflects changes in body fluid balance accurately. Body weight alone can fluctuate due to various factors, including food intake and bowel movements, which may not accurately represent fluid status. Intake and output provide information on fluid balance over time but may not reflect immediate changes. Skin turgor is a physical assessment finding that indicates hydration status, not overall fluid volume status.