A client weighs 92 kg and is prescribed heparin 12 units/kg/hr. The heparin is supplied as 25,000 units in 250 mL. How many mL/hr should the client receive? (Round to the nearest whole number)

• A. 9 mL/hr
• B. 11 mL/hr
• C. 13 mL/hr
• D. 15 mL/hr

Answer: (B)

Focus on converting a weight-based, per-hour dose into a drip rate using the solution’s concentration. First, calculate how many units per hour are needed: 92 kg × 12 units/kg/hr = 1104 units/hr. The heparin solution has 25,000 units in 250 mL, which is 100 units per mL. To find the mL per hour, divide the required units by the concentration: 1104 ÷ 100 = 11.04 mL/hr. Round to the nearest whole number: 11 mL/hr. So the client should receive about 11 mL per hour. For context, 9 mL/hr would deliver 900 units/hr, 13 mL/hr would deliver 1300 units/hr, and 15 mL/hr would deliver 1500 units/hr—none match the prescribed 1104 units/hr.