Calculate the flow rate in mL/hr and gtt/min using the formula method 1,500 mL NS in 12 hr. Drop factor: 10 gtt/mL.

Given: Volume of fluid: 1,500 mL Infusion time: 12 hours Drop factor: 10 gtt/mL Formula for mL/hr: Flow rate (mL/hr) = Volume (mL) / Time (hr) Step 1: Calculate the flow rate in mL/hr: Flow rate (mL/hr) = 1,500 mL / 12 hr Flow rate (mL/hr) = 125 mL/hr Formula for gtt/min: Flow rate (gtt/min) = (Volume (mL) / Time (hr)) x Drop factor (gtt/mL) / 60 min/hr Step 2: Calculate the flow rate in gtt/min: Flow rate (gtt/min) = (1,500 mL / 12 hr) x 10 gtt/mL / 60 min/hr Flow rate (gtt/min) = 125 mL/hr x 10 gtt/mL / 60 min/hr Flow rate (gtt/min) = 1250 gtt/hr / 60 min/hr Flow rate (gtt/min) = 20.83 gtt/min Step 3: Round to the nearest whole number: Flow rate (mL/hr) = 125 mL/hr Flow rate (gtt/min) ≈ 21 gtt/min