# Dosage Calculations

MUST SHOW WORKDirections: Calculate each mathematical question using the appropriate equations for each. Remember to add the correct metrics with your answer. Round to the nearest tenth (one decimal place).1. Order: Dobutamine 0.5 mcg/kg/min. Continuous IV. Patient is 211.86 lbs. Supply is Dobutamine concentration is 1mg/ml. How many mls/hr?2. Order start Dopamine 2 mcg/kg/min continuous IV and titrate until SBP is above 90 mmHg. Patient is 174.9 lbs. Supply is Dopamine 200mg in 100 milliliters of 5% dextrose. How many ml/hr do you start with? (round to the nearest whole number)3. The above order was titrated until the patients SBP was 90 mmHg. It is currently running at 8 ml/hr. How many mcg/kg/min is the patient receiving? (round to the nearest tenth)4. The physician orders heparin 5500 units subcutaneous for deep vein thrombosis prevention. The medication is supplied in 10,000 units/mL. How many milliliters will the nurse administer? ____________________5. The physician orders heparin 3500 units subcutaneous daily postoperatively. The medication is supplied in 5000 units/mL. How many milliliters will the nurse administer? _________6. The physician orders penicillin G procaine 600,000 units IM for syphilis. The medication is supplied in 1,200,000 units/2 mL. How many milliliters will the nurse administer? _________7. The physician orders Epogen 4500 units subcutaneous for red blood cell production. The medication is supplied in 4000 units/mL. How many milliliters will the nurse administer? _______8. The physician orders dopamine 2.25 mcg/kg/min for a patient who weighs 116 lbs. How many ml/hr will the patient get if the concentration is 400 mg in 500 milliliters of 5% dextrose in water?9. The physician orders a continuous IV morphine drip to infuse at 6 mg/h. The medication is supplied in 50 mg/50 mL. What is the infusion rate in milliliters per hour (mL/hr)?10. The physician orders vancomycin 500 mg in 250 mL of D5W IVPB daily to infuse over 2 hours. Tubing drop factor is 15 gtt/mL. What is the drip rate in drops per a minute (gtt/min)?11. Begin a heparin drip per the facilitys protocol. The patients weight is 96 kg.Heparin ProtocolBolus: Heparin 80 units/kg using the following concentration:How many milliliter (mL) bolus will be given? Infusion: Heparin 18 units/kg/h using a concentration of heparin 25,000 units in 250 mL of NS (100 units/mL). How many milliliters per an hour (mL/hr) is the infusion rate? (round to a whole number)12. Order: Begin a heparin drip per the facilitys protocol. The patients weight is 176 lbs.Heparin ProtocolBolus: Heparin 75 units/kg using the following concentration:How many milliliter bolus will be administered?Infusion: Heparin 18 units/kg/h using a concentration of heparin 25,000 units in 250 mL of NS (100 units/mL). How many milliliters per an hour (mL/hr) is the infusion rate? (round to a whole number)13. Insert the correct responses. Do not round doses.The physician orders prednisone 10 mg oral every 12 hours for a child weighing 22 lb. The prednisone syrup is available in a 5 mg/5 mL concentration. The recommended dose is 0.5 to 2 mg/kg/24 h.a. What is the childs weight in kilograms? __________b. How many milligrams per kilogram per 24 hours is the patient receiving? _____c. Is the order safe? Yes____________d. If yes, how many milliliters are needed for each dose? _________14. Insert the correct responses. Do not round doses.The physician orders ibuprofen 200 mg oral every 6 hours for a child weighing 60 lb. The ibuprofen is available in a 100 mg/5 mL concentration. The recommended dose is 5 to 10 mg/kg/dose.a. What is the childs weight in kilograms? _______________b. How many milligrams per kilogram per 24 hours is the patient receiving? _________c. Is the order safe? _________________d. If yes, how many milliliters are needed for each dose? __________________15. Insert the correct responses. Do not round doses.The physician orders Ancef 500 mg IV every 8 hours for a child weighing 30 lb. The Ancef is available in a 330 mg/mL concentration. The recommended dose is 100 mg/kg/24 h divided in three doses.a. What is the childs weight in kilograms? ___________b. How many milligrams per kilogram per 24 hours is the patient receiving? ___________c. Is the order safe? _____________d. If yes, how many milliliters are needed for each dose? ______16. Insert the correct responses. Do not round doses.Maintenance Rate TableWeight RangeRequired Daily Fluid0-10 kg100 mL per kg10-20 kg1000 mL + 50 mL per kg above 10 kg20-70 kg1500 mL + 20 mL per kg above 20 kgOver 70 kg2500 mL (adult requirement)A child is to receive IV fluids at maintenance rate. The child weighs 60 lb.a. What is the childs weight in kilograms? _____________b. Calculate the 24-hour fluid requirements for this patient. ____________c. How many milliliters per hour are needed to deliver the maintenance fluids?More practice problems available on pages 235 241 and 283 – 288 in Boyer, M. J. (2015). Math For Nurses: A Pocket Guide to Dosage Calculation and Drug Preparation.