A medical order calls for 1 mg/kg for a child weighing 22 kg. The concentration is 10 mg/mL. What volume is needed in milliliters?

A medical order calls for 1 mg/kg for a child weighing 22 kg. The concentration is 10 mg/mL. What volume is needed in milliliters?

• A. 2.0 mL
• B. 2.2 mL
• C. 1.0 mL
• D. 3.0 mL

Answer: (B)

To find the needed volume, use Volume = Dose / Concentration. First determine the total dose: 22 kg × 1 mg/kg = 22 mg. The drug is 10 mg per mL, so each mL contains 10 mg. Divide the total dose by the concentration: 22 mg ÷ 10 mg/mL = 2.2 mL. So, to deliver 22 mg, you would administer 2.2 mL. (For context, 2.0 mL would provide 20 mg, 1.0 mL would provide 10 mg, and 3.0 mL would provide 30 mg.)

To find the needed volume, use Volume = Dose / Concentration. First determine the total dose: 22 kg × 1 mg/kg = 22 mg. The drug is 10 mg per mL, so each mL contains 10 mg. Divide the total dose by the concentration: 22 mg ÷ 10 mg/mL = 2.2 mL. So, to deliver 22 mg, you would administer 2.2 mL. (For context, 2.0 mL would provide 20 mg, 1.0 mL would provide 10 mg, and 3.0 mL would provide 30 mg.)