Ordered: Levothyroxine 150 mcg PO every day. Available in bottle of suspension: 50 mcg/2 mL. Safe dose range: 5-6 mcg/kg/24 hr. Weight: 16.1 kg. Is this a safe dose for this patient?

Step 1 is: Calculate the minimum safe dose for 24 hours. 5 mcg/kg/24 hr × 16.1 kg = 80.5 mcg/24 hr. Step 2 is: Calculate the maximum safe dose for 24 hours. 6 mcg/kg/24 hr × 16.1 kg = 96.6 mcg/24 hr. Step 3 is: Compare the ordered dose to the safe range. The ordered dose is 150 mcg. The safe dose range is 80.5 mcg to 96.6 mcg. The ordered dose (150 mcg) is higher than the maximum safe dose (96.6 mcg). The ordered dose is NOT safe, so the initial answer is B. However, the question choices are A. Yes, B. No, C. The dose is too low for the client's weight, D. The safe dose range is too narrow to determine. Since the ordered dose is too high, the most accurate choice indicating it is NOT safe is "No". Choice A rationale The statement "Yes" is incorrect because the ordered dose of 150 mcg is significantly above the calculated safe range maximum of 96.6 mcg/24 hr. Administering an overdose of levothyroxine can lead to hyperthyroidism symptoms like tachycardia, heat intolerance, and anxiety, which is not a safe practice. Choice B rationale The statement "No" is correct because the ordered dose of 150 mcg is not within the therapeutic and safe range of 80.5 mcg to 96.6 mcg for a 16.1 kg child. Dosing levothyroxine accurately is crucial as it has a narrow therapeutic index, and excess dosage carries risks of serious cardiac side effects. Choice C rationale The statement "The dose is too low for the client's weight" is incorrect. The maximum safe dose is 96.6 mcg, and the ordered dose is 150 mcg, which makes the ordered dose too high, not too low. Giving an excessively high dose can cause adverse effects due to drug toxicity or an induced hypermetabolic state in the body systems. Choice D rationale The statement "The safe dose range is too narrow to determine" is incorrect. The safe dose range is clearly defined by the provided parameters as 80.5 mcg to 96.6 mcg/24 hr. The calculation provides a precise and sufficient range to determine that the ordered dose of 150 mcg is clearly unsafe and should be questioned by the nurse.