A client is to receive 15 mcg/min nitroglycerine IV. The concentration of solution is 50 mg in 250 mL D5W. What should the flow rate be (in mL/hr) to deliver 15 mcg/min? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Calculation: Convert the ordered dose rate from micrograms per minute (mcg/min) to milligrams per hour (mg/hr). Convert mcg to mg: 15 mcg / 1000 = 0.015 mg. Convert the rate from per minute to per hour: 0.015 mg/min x 60 min/hr = 0.9 mg/hr. Determine the concentration of the solution in milligrams per milliliter (mg/mL). Concentration = 250 mL50 mg​ =0.2 mg/mL. Calculate the flow rate in mL/hr. Flow rate (mL/hr) = Concentration (mg/mL)Ordered rate (mg/hr)​ = 0.2 mg/mL0.9 mg/hr ​=4.5 mL/hr.