A patient weighs 80 pounds. To calculate a dose of 10 mg/kg, what is the total daily dose in milligrams (approximately)?

A patient weighs 80 pounds. To calculate a dose of 10 mg/kg, what is the total daily dose in milligrams (approximately)?

• A. 360 mg
• B. 320 mg
• C. 380 mg
• D. 400 mg

Answer: (A)

Converting weight to kilograms and multiplying by the mg per kg dose shows the total daily dose. Convert 80 lb to kg: 80 ÷ 2.2046 ≈ 36.3 kg. Multiply by 10 mg/kg: 36.3 × 10 ≈ 363 mg. Rounding to a practical dose gives about 360 mg daily. The other values would correspond to using weight estimates like 32 kg (320 mg), 38 kg (380 mg), or 40 kg (400 mg), which aren’t as accurate for this weight.

Converting weight to kilograms and multiplying by the mg per kg dose shows the total daily dose. Convert 80 lb to kg: 80 ÷ 2.2046 ≈ 36.3 kg. Multiply by 10 mg/kg: 36.3 × 10 ≈ 363 mg. Rounding to a practical dose gives about 360 mg daily. The other values would correspond to using weight estimates like 32 kg (320 mg), 38 kg (380 mg), or 40 kg (400 mg), which aren’t as accurate for this weight.