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Hesi Medical Dosage Calculation
Total Questions : 53
Showing 10 questions, Sign in for moreThe 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
· Convert pounds to kilograms:
- 88 lb * (1 kg / 2.2 lb) = 40 kg
· Calculate the maximum daily dose:
- 50 mg/kg/day * 40 kg = 2000 mg/day
Prescribed dose:
500mg every 8 hours
24hrs/8= 3 doses
Each dose= 500mg
Daily dose =500mg X 3= 1500mg
Available formulation= 250mg/5ml
Ml to administer per day = 1500 X 5/250= 30ml
Each dose= 30ml/3= 10ml
The healthcare provider prescribes cefazolin 800 mg IM every six hours. The available vial is labeled, "Cefazolin 1 gram," and the instructions for reconstitution state, For IM use add 2.5 mL sterile water for injection to provide a total volume of 3.0 mL". After reconstitution, the solution contains how many mg/mL? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Explanation
The vial contains 1 gram of cefazolin, which is equal to 1000 mg.
After adding 2.5 mL of sterile water for injection, the total volume of the solution is 3.0 mL.
To find out how many mg of cefazolin are in each mL of the solution, we need to divide the total amount of cefazolin by the total volume of the solution: 1000 / 3 = 333.3333 mg/mL.
Therefore, after reconstitution, the solution contains about 333 mg/mL of cefazolin (rounded to the nearest whole number).
A client receives a prescription for warfarin 2 mg IM daily. The pharmacy delivers a vial labeled, warfarin 5 mg/single-use vial. The instructions read, reconstitute with 2.7 mL of sterile water for injection to yield 2 mg/mL. How many mL should the nurse administer? (Enter the numerical value only.)
Explanation
To find out how many mL of warfarin to administer, we need to divide the prescribed dose (2 mg) by the concentration of the reconstituted solution (2 mg/mL). This gives us 1 mL as the answer.
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
To find out how many mL of amoxicillin to administer, we need to first convert the child's weight from pounds to kilograms, since the prescription is based on kg. To do this, we multiply 66 pounds by 0.454, which gives us 29.964 kg.
Then, we multiply this by the prescribed dose (80 mg/kg/day) to get the total daily dose of amoxicillin, which is 2397.12 mg.
Next, we divide this by the number of doses per day (2) to get the dose per 12 hours, which is 1198.56 mg.
Finally, we divide this by the concentration of the suspension (400 mg per 5 mL) to get the volume to administer, which is 14.98 mL.
We can round this up to 15 mL as the answer.
The healthcare provider prescribes enoxaparin 1 mg/kg subcutaneously every 12 hours for a client who weighs 132 pounds. The medication is available in 60 mg/0.6 mL prefilled syringe. How many mL should the nurse administer per day? (Enter numerical value only.)
Explanation
To find out how many mL of enoxaparin to administer per day, we need to first convert the client's weight from pounds to kilograms, since the prescription is based on kg. To do this, we multiply 132 pounds by 0.454, which gives us 59.928 kg.
Then, we multiply this by the prescribed dose (1 mg/kg) to get the dose per 12 hours, which is 59.928 mg.
Next, we divide this by the concentration of the prefilled syringe (60 mg/0.6 mL) to get the volume to administer per 12 hours, which is 0.59928 mL. We can round this up to 0.6 mL as the answer.
Finally, we multiply this by the number of doses per day (2) to get the total volume to administer per day, which is 1.2 mL as the answer.
A pediatric client with cerebral palsy receives a prescription for a 75% enteral nutrition formula of 320 mL to infuse at 80 mL/hour via an enteral feeding pump. The formula is available full strength in a 240 mL can. To prepare the solution, the nurse should use how many mL of the enteral nutrition formula? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Explanation
To answer this question, we need to calculate the amount of enteral nutrition formula needed to make a 75% solution of 320 mL. We can use the formula:
Amount of formula = (Desired concentration / Available concentration) x Total volume Amount of formula = (0.75 / 1) x 320
Amount of formula = 240 mL
Therefore, the nurse should use 240 mL of the enteral nutrition formula to prepare the solution. This means that the nurse will use one full can of the formula and add 80 mL of water to dilute it to 75%.
A client is receiving one liter of DW 0.45% normal saline IV every 8 hours by gravity infusion. The IV tubing has a drip factor of 12 gtt/mL. The nurse should regulate the IV to deliver how many drops per minute? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Explanation
Volume to be infused = 1 liter = 1000 mL
Drop factor = 12 gtt/mL
Time in minutes = 8 hours = 8 hours × 60 minutes/hour = 480 minutes Drops per minute (gtt/min) = (1000 mL × 12 gtt/mL) / 480 minutes
Drops per minute (gtt/min) = 12000 / 480
Drops per minute (gtt/min) ≈ 25
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
First, we have to convert 44 ponds to kgs = 44/ 2.205
= 19.958 kgs
Then, we calculate the mg to be administered by multiplying the above with 40 = 40 x 19.958
= 798.32
= 798 mg (rounded off to the nearest whole number)
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
First, we need to convert 88 pounds to kgs = 88/2.205
= 39.916 kgs
Then we calculate the mcg needed to be administered to the child per day = 5 x 39.916 = 199.58 mcg/day
To calculate the mLs needed to be administered daily we divide 199.58 by 300 mcg/mL = 0.67 mL
= 0.7 mL (rounded off to the nearest tenth)
The healthcare provider prescribes lamivudine oral solution 150 mg twice daily for a client who is HIV positive. The available bottle contains 240 mL of lamivudine labeled, "10 mg/mL." How many mL should the nurse administer in a 24 hour period? (Enter numeric value only.)
Explanation
First we calculate the total mg of the drug taken over 24 hours= (150 mg x 2 doses/day) = 300 mg/day.
Then, calculate the mLs needed to be administered per day = 300 mg/day divided by 10 mg/mL
= 30 mL/day.
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