RN HESI Dosage Calculations II
Total Questions : 55
Showing 25 questions, Sign in for moreA client is receiving a secondary infusion of vancomycin 1,500 mg in 250 mL to be infused over two hours. The IV administration set delivers 10 gtt/mL. How many gtt/min should the nurse regulate the infusion? (Enter numerical value only. If rounding is required, round to the nearest whole number.)
Explanation
To calculate the gtt/min, use the formula: gtt/min = (volume in mL x drop factor in gtt/mL) / time in min
Plug in the given values: gtt/min = (250 mL x 10 gtt/mL) / 120 min Simplify and solve: gtt/min = 2500 gtt / 120 min = 20.83 gtt/min
Round to the nearest whole number: gtt/min = 21
The nurse should regulate the infusion at 21 gtt/min
The healthcare provider prescribes enoxaparin 1 mg/kg subcutaneously every 12 hours for a client who weighs 132 pounds. The medication is available in a 60 mg/0.6 mL prefilled syringe. How many mL should the nurse administer per day? (Enter numerical value only.)
Explanation
- Convert the client's weight to kilograms: 132 pounds / 2.2 = 60 kg
- Calculate the daily dose of enoxaparin: 1 mg/kg x 60 kg x 2 times = 120 mg - Calculate the volume of medication to administer: 120 mg / 60 mg x 0.6 mL = 1.2 mL
- The nurse should administer 1.2 mL of enoxaparin per day.
The healthcare provider prescribes amoxicillin 500 mg every 8 hours for a child who weighs 88 pounds. The recommended maximum safe dose is 50 mg/kg/24 hour. The available suspension is labeled, Amoxicillin Suspension 250 mg/5 mL. Based on this child weight, how many mL should the nurse administer ? (Enter numerical value only. (If rounding is required, round to the whole number.)
Explanation
- To calculate the dose in mL, use the formula: Dose (mL) = Dose (mg) / Concentration (mg/mL)
- The child's weight in kg is 88 / 2.2 = 40 kg
- The maximum safe dose for the child is 50 x 40 = 2000 mg per day - The prescribed dose for the child is 500 x 3 = 1500 mg per day, which is below the maximum safe dose
- The dose in mL for each administration is 500 / (250 / 5) = 10 mL - The nurse should administer 10 mL of amoxicillin suspension every 8 hours
Filgrastim 5 mcg/kg/day subcutaneous is prescribed for a child with cancer who weighs 88 pounds. The medication is labeled 300 mcg/mL. How many mL should the nurse administer daily to this child? (Enter the numerical value only. If rounding required, round to the nearest tenth.)
Explanation
- Convert pounds to kilograms: 88 / 2.2 = 40 kg
- Calculate the daily dose in mcg: 5 x 40 = 200 mcg
- Calculate the volume in mL: 200 / 300 = 0.67 mL
- Answer: 0.7 mL
The healthcare provider prescribes liraglutide 1.2 mg subcutaneously daily for a client with type 2 diabetes mellitus. The liraglutide Pen contains 18 mg of liraglutide and will deliver doses of 0.6 mg, 1.2 mg, or 1.8 mg. When teaching the client about the use of the liraglutide Pen, how many doses should the nurse tell the client is available in each Pen? (Enter the numerical value only.)
Explanation
- The liraglutide Pen contains 18 mg of liraglutide.
- The Pen can deliver doses of 0.6 mg, 1.2 mg, or 1.8 mg.
- The healthcare provider prescribed 1.2 mg daily for the client.
- To calculate the number of doses in each Pen, divide 18 mg by 1.2 mg.
- The answer is 15 doses per Pen.
A client receives a prescription for amoxicillin 2 g/clavulanate 125 mg by mouth every 12 hours for 10 days. The medication is available in 1000 mg/62.5 mg extended-release tablets. How many tablets should the nurse administer? (Enter numerical value only.)
Explanation
- To calculate the number of tablets, divide the prescribed dose by the available dose.
- Prescribed dose: 2 g amoxicillin + 125 mg clavulanate
- Available dose: 1000 mg amoxicillin + 62.5 mg clavulanate
- Number of tablets = (2 g / 1000 mg) + (125 mg / 62.5 mg)
- Number of tablets = 2 + 2
- Number of tablets = 4
- The nurse should administer 4 tablets every 12 hours for 10 days.
The nurse is initiating a prescription for Dextrose 2.5% in 0.45% Sodium Chloride (D5 0.5% NS) at 45 mL/hour for a child with dehydration. The nurse attaches a volume control administration set with a microdrip chamber to the bag of solution. How many microdrops/minute should the nurse regulate the infusion? (Enter the numerical value only. If rounding is required, round to the nearest whole number.)
Explanation
- Calculate the hourly volume in mL: 45 mL/hour
- Convert the hourly volume to minute volume: 45 mL/hour ÷ 60 minutes/hour = 0.75 mL/minute
- Multiply the minute volume by the drop factor: 0.75 mL/minute x 60 microdrops/mL = 45 microdrops/minute
- The nurse should regulate the infusion at 45 microdrops/minute
The healthcare provider prescribes heparin 1,400 units/hour intravenously (IV). The IV bag contains heparin 20,000 units in 250 mL dextrose 5% in water. How many mL/hr should the nurse program the infusion pump to deliver? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Explanation
- Calculate the infusion rate using the formula: mL/hr = (units/hr) x (mL) / (units) - Plug in the values: mL/hr = (1,400) x (250) / (20,000)
- Simplify and round to the nearest whole number: mL/hr = 17
- Program the infusion pump to deliver 17 mL/hr of heparin solution
A client receives a prescription for amoxicillin 2 g/clavulanate 125 mg by mouth every 12 hours for 10 days. The medication is available in 10C mg/62.5 mg extended-release tablets. How many tablets should the nurse administer? (Enter numerical value only.)
Explanation
- To calculate the number of tablets, divide the prescribed dose by the available dose.
- Prescribed dose: 2 g amoxicillin + 125 mg clavulanate
- Available dose: 1000 mg amoxicillin + 62.5 mg clavulanate
- Number of tablets = (2 g / 1000 mg) + (125 mg / 62.5 mg)
- Number of tablets = 2 + 2
- Number of tablets = 4
- The nurse should administer 4 tablets every 12 hours for 10 days.
A child with a seizure disorder receives a prescription for phenytoin 20 mg by mouth every 8 hours. The suspension is available in 125 mg/5 mL. How many mL should the nurse administer? (Enter the numerical value only. If rounding is required, round to the nearest tenth.)
Explanation
To calculate the dose of phenytoin, use the formula: Dose (mL) = (Desired dose x Volume) / Stock dose
- Plug in the values: Dose (mL) = (20 mg x 5 mL) / 125 mg
- Simplify and solve: Dose (mL) = 0.8 mL
- The nurse should administer 0.8 mL of phenytoin suspension every 8 hours.
Penicillin G procaine 240,000 units intramuscularly is prescribed for a 4-year-old child who has a streptococcal respiratory infection. The medication vial is labeled 1,200,000 units/2 mL. How many mL should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Explanation
To calculate the dosage, use the formula: D/H x Q = X
- D is the desired dose, H is the dose on hand, Q is the quantity, and X is the amount to administer
- Plug in the values: 240,000/1,200,000 x 2 = 0.4
- The nurse should administer 0.4 mL of penicillin G procaine
A client receives a prescription for oxytocin 2 milliunits/min intravenously (IV) for labor augmentation. The IV bag contains oxytocin 20 units in actated Ringer's 1 liter. How many mL/hour should the nurse program the infusion pump to deliver? (Enter numerical value only.)
Explanation
- To calculate the infusion rate, use the formula: infusion rate (mL/h) = dose (units/h) x volume (mL) / concentration (units)
- In this case, the dose is 2 milliunits/min or 0.12 units/h
- The volume is 1000 mL and the concentration is 20 units
- Plug in the values and simplify: infusion rate = 0.12 x 1000 / 20
- The infusion rate is 6 mL/h
- The nurse should program the pump to deliver 6 mL/h
A client with a gram-positive bacterial skin infection is receiving daptomycin 500 mg IV every 24 hours. The pharmacy delivers a secondary infusion of 0.9% Sodium Chloride with daptomycin 500 mg/100 mL to be infused in 30 minutes. How many mL/hour should the nurse program the infusion pump? (Enter the numerical value only.)
Explanation
- To calculate the infusion rate, divide the volume of the solution by the infusion time in hours: 500 mg/100 mL / 0.5 hour = 200 mL/hour
- The nurse should program the infusion pump to deliver 200 mL/hour of daptomycin solution
- The answer is 200 (mL/hour)
A client receives a prescription for 1 liter of lactated Ringer's intravenously (IV) to be infused over 12 hours. The IV administration set delivers 60 gtt/mL. How many gtt/min should the nurse regulate the infusion? (Enter numerical value only. If rounding is required, round to the nearest whole number.)
Explanation
- Calculate the total volume of fluid to be infused in mL: 1 liter = 1000 mL - Divide the total volume by the infusion time in minutes: 1000 mL / (12 hours x 60 minutes) = 1.39 mL/min
- Multiply the infusion rate in mL/min by the drop factor in gtt/mL: 1.39 mL/min x 60 gtt/mL = 83.33 gtt/min
- Round the answer to the nearest whole number: 83 gtt/min
The healthcare provider prescribes an IV bolus of diltiazem 0.25 mg/kg for a client with atrial fibrillation. The client weighs 178 pounds. How many mg should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Explanation
- Convert client's weight from pounds to kilograms: 178 / 2.2 = 80.9 kg
- Multiply client's weight by prescribed dose of diltiazem: 80.9 x 0.25 = 20.225 mg - Round the result to the nearest whole number: 20 mg
- The nurse should administer 20 mg of diltiazem IV bolus
A client with human immunodeficiency virus (HIV) begins active labor at 38 weeks gestation and receives a prescription for zidovudine 2 mg/kg IV, to be administered over 1 hour. The client weighs 185 lbs. Based on the client's weight, how many mg should the nurse prepare to administer? (Enter numerical value only. If rounding is required, round to the nearest whole number.)
Explanation
- Convert the client's weight from lbs to kg: 185 lbs / 2.2 = 84.09 kg - Multiply the client's weight by the prescribed dose: 84.09 kg x 2 mg/kg = 168.18 mg - Round the result to the nearest whole number: 168 mg
- The nurse should prepare to administer 168 mg of zidovudine IV over 1 hour.
The healthcare provider prescribed 2 liters of 5% Dextrose in water (DW) to infuse in 24 hours. The IV administration set delivers 15 gtt/mL. How many mL/hour should the nurse program the infusion pump? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Explanation
- Calculate the total volume of fluid to be infused: 2 liters = 2000 mL - Divide the total volume by the infusion time: 2000 mL / 24 hours = 83.33 mL/hour - Round to the nearest whole number: 83 mL/hour
- The infusion pump should be programmed to deliver 83 mL/hour of 5% DW
The healthcare provider prescribes filgrastim 5 mcg/kg/day subcutaneously for a client who weighs 132 pounds and has just completed chemotherapy. The medication is available in 480 mcg/0.8 mL. How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth).
Explanation
Convert client's weight to kilograms: 132 pounds / 2.2 = 60 kg
- Calculate the dose of filgrastim in mcg: 5 mcg/kg/day x 60 kg = 300 mcg/day - Calculate the volume of filgrastim in mL: 300 mcg/day / 480 mcg/0.8 mL = 0.5 mL/day
- The nurse should administer 0.5 mL of filgrastim subcutaneously.
The nurse is initiating a 500 mL IV of normal saline at 60 mL/hour for a client with heart failure. How many hours should the IV infuse? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Explanation
- Divide the volume of the IV by the infusion rate to get the duration of the infusion. 500 mL / 60 mL/hour = 8.333 hours.
- Round to the nearest tenth. 8.333 hours ≈ 8.3 hours.
A client who weighs 60 kg receives a prescription for dalteparin 200 units/kg subcutaneously once a day for a month. The medication is available in 25,000 units/mL vial. How many mL should the nurse administer? (Enter a numerical value. If rounding is required, round to the nearest tenth.)
Explanation
- Calculate the dose of dalteparin in units: 60 kg x 200 units/kg = 12,000 units - Calculate the volume of dalteparin in mL: 12,000 units / 25,000 units/mL = 0.48 mL
- Round the volume to the nearest tenth: 0.5 mL
- The nurse should administer 0.5 mL of dalteparin subcutaneously once a day
A client who weighs 154 pounds receives a prescription for epoetin alfa 50 units/kg subcutaneously 3 times a week. The medication is available in 2000 units/mL vial. How many mL should the nurse administer with each dose? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
Explanation
- Convert the client's weight to kilograms: 154 pounds / 2.2 = 70 kg - Calculate the dose in units: 50 units/kg x 70 kg = 3500 units
- Calculate the volume in mL: 3500 units / 2000 units/mL = 1.75 mL
- Round to the nearest tenth: 1.8 mL
- The nurse should administer 1.8 mL with each dose.
A child is to receive vancomycin 40 mg/kg intravenously one hour before a scheduled procedure. The child weighs 44 pounds. How many mg of the medication should the nurse administer? (Enter numeric value only.)
Explanation
- Convert pounds to kilograms: 44 pounds / 2.2 = 20 kg
- Multiply weight by dosage: 20 kg x 40 mg/kg = 800 mg
- Answer: The nurse should administer 800 mg of vancomycin.
A client receives a prescription for 1 liter of lactated Ringer's intravenously (IV) to be infused over 8 hours. The IV administration set delivers 20 gtt/mL. How many gtt/min should the nurse regulate the infusion? (Enter numerical value only. If rounding is required, round to the nearest whole number.)
Explanation
- Calculate the total volume in mL: 1 liter = 1000 mL
- Calculate the total infusion time in minutes: 8 hours x 60 minutes = 480 minutes
- Calculate the infusion rate in mL/min: 1000 mL / 480 minutes = 2.08 mL/min
- Calculate the infusion rate in gtt/min: 2.08 mL/min x 20 gtt/mL = 41.6 gtt/min
- Round to the nearest whole number: 42 gtt/min
A client who weighs 91 kg receives a prescription for a continuous infusion of dopamine at 3 mcg/kg/min. The solution is labeled, "Dopamine 400 mg in 5% Dextrose Injection 250 mL." How many mL/hr should the nurse program the infusion pump to deliver? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Explanation
- Calculate the dose of dopamine in mcg/min: 3 mcg/kg/min x 91 kg = 273 mcg/min
- Convert the dose to mg/hr: 273 mcg/min x 60 min/hr x 1 mg/1000 mcg = 16.38 mg/hr
- Calculate the infusion rate in mL/hr: 16.38 mg/hr x 250 mL/400 mg = 10.24 mL/hr
- Round to the nearest tenth: 10.2 mL/hr
- Program the infusion pump to deliver 10.2 mL/hr
A child who weighs 66 pounds receives a prescription for amoxicillin 80 mg/kg/day by mouth in divided doses every 12 hours. The bottle is labeled, "Amoxicillin for Oral Suspension, USP 400 mg per 5 mL." How many mL should the nurse administer with each dose? (Enter numerical value only.)
Explanation
- Calculate the daily dose of amoxicillin for the child: 80 mg/kg/day x 66 pounds / 2.2 pounds/kg = 2400 mg/day
- Divide the daily dose by the number of doses per day: 2400 mg/day / 2 doses/day = 1200 mg/dose
- Convert the dose from mg to mL using the label information: 1200 mg/dose x 5 mL/400 mg = 15 mL/dose
- The nurse should administer 15 mL of amoxicillin with each dose.
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