A nurse is preparing to administer regular insulin 5 units/hr by continuous IV infusion. Available is regular insulin 100 units in 0.9% sodium chloride 1,000 mL. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["50"]
Calculation:
Determine the total units of insulin available:
Available insulin: 100 units
Determine the total volume of the solution:
Total volume: 1000 mL
Calculate the concentration of the insulin solution in units per milliliter:
Formula: Concentration (units/mL) = Total units / Total mL
= 100 units / 1000 mL
= 0.1 units/mL
Determine the desired dose of insulin per hour:
Ordered dose: 5 units/hr
Calculate the IV pump flow rate in mL/hr:
Formula: Flow rate (mL/hr) = Desired dose per hour (units/hr) / Concentration (units/mL)
= 5 units/hr / 0.1 units/mL
= 50 mL/hr
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["25"]
Explanation
Calculation:
Determine the total volume to be infused per hour:
Ordered rate: 100 mL/hr
Determine the drop factor of the IV tubing:
Drop factor: 15 gtt/mL
Calculate the total number of drops to be infused per hour:
Formula: Total drops per hour (gtt/hr) = Total volume (mL/hr) × Drop factor (gtt/mL)
= 100 mL/hr × 15 gtt/mL
= 1500 gtt/hr
Convert the flow rate to drops per minute:
Conversion factor: 1 hour = 60 minutes
Formula: Flow rate (gtt/min) = Total drops per hour (gtt/hr) / 60 min/hr
= 1500 gtt/hr / 60 min/hr
= 25 gtt/min
Correct Answer is ["23"]
Explanation
Calculation:
Calculate the total amount of lidocaine in milligrams:
Available lidocaine: 2 g
Conversion: 2 g × 1000 mg/g = 2000 mg
Determine the concentration of the lidocaine solution in milligrams per milliliter:
Total lidocaine: 2000 mg
Total volume of solution: 250 mL
Formula: Concentration (mg/mL) = Total milligrams / Total mL
= 2000 mg / 250 mL
= 8 mg/mL
Calculate the desired dose of lidocaine per hour in milligrams:
Ordered dose: 3 mg/min
Conversion: 3 mg/min × 60 min/hr = 180 mg/hr
Calculate the IV pump flow rate in mL/hr:
Formula: Flow rate (mL/hr) = Desired dose per hour (mg/hr) / Concentration (mg/mL)
= 180 mg/hr / 8 mg/mL
= 22.5 mL/hr
Round the answer to the nearest whole number:
22.5 mL/hr rounded to the nearest whole number is 23 mL/hr.
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