A dose calls for 10 mg/kg; patient weighs 9.9 kg. What is the correct dose?

A dose calls for 10 mg/kg; patient weighs 9.9 kg. What is the correct dose?

• A. 9.9 mg
• B. 99 mg
• C. 990 mg
• D. 19.8 mg

Answer: (B)

Dose in milligrams is found by multiplying the dose per kilogram by the patient’s weight in kilograms. Here, it’s 10 mg/kg and the patient weighs 9.9 kg. So, 10 mg/kg × 9.9 kg = 99 mg. The units cancel to give milligrams, so the total dose should be 99 mg. The other numbers would come from using a different per‑kilogram dose or a different weight (for example, 9.9 mg would be with 1 mg/kg, 990 mg with 100 mg/kg or a weight of 99 kg, and 19.8 mg with 2 mg/kg).

Dose in milligrams is found by multiplying the dose per kilogram by the patient’s weight in kilograms. Here, it’s 10 mg/kg and the patient weighs 9.9 kg. So, 10 mg/kg × 9.9 kg = 99 mg. The units cancel to give milligrams, so the total dose should be 99 mg. The other numbers would come from using a different per‑kilogram dose or a different weight (for example, 9.9 mg would be with 1 mg/kg, 990 mg with 100 mg/kg or a weight of 99 kg, and 19.8 mg with 2 mg/kg).