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Hesi bsn 215 rn dosage calculation nightingale college proctored exam
Total Questions : 55
Showing 10 questions, Sign in for moreThe healthcare provider prescribes hydromorphone 1 mg IV every 3 hours for an older client after repair of a fractured hip. The nurse prepares the prescribed dose from an ampule labeled, Hydromorphone Injection 2 mg/1 mL. Additional instructions for opiate naive clients recommend diluting the desired dosage with 3 mL of sterile normal saline (NS) for IV push over 2 to 3 minutes. How many mL is the total volume of diluted medication? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
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Explanation
Calculation:
- Identify the ordered dose and available concentration
Ordered Dose: 1 mg
Available Concentration: 2 mg/1 mL
Diluent to Add: 3 mL sterile normal saline
- Calculate the volume of hydromorphone to withdraw
Volume of Medication = Ordered Dose ÷ Concentration
Volume of Medication = 1 ÷ 2
Volume of Medication = 0.5 mL
- Calculate the total diluted volume
Total Volume = Volume of Medication + Volume of Diluent
Total Volume = 0.5 + 3
Total Volume = 3.5 mL
The healthcare provider prescribes cephalexin 350 mg by mouth every 6 hours for a child who weighs 88 pounds. The available suspension is labeled, "Cephalexin Suspension 125 mg/5 mL". The recommended safe dose range is 25 to 50 mg/kg/24 hours in 4 divided doses. How many mL should the nurse administer based on the child's weight? (Enter numerical value only. If rounding is required, round to the nearest whole number.)
Explanation
Calculation:
- Identify the ordered dose and available concentration
Ordered Dose: 350 mg every 6 hours
Available Concentration: 125 mg/5 mL
Child's Weight: 88 lb (convert to kg: 88 ÷ 2.2 = 40 kg)
- Verify that the prescribed dose is within the safe range
Safe Daily Dose Range = 25 to 50 mg/kg/day
Minimum Daily Dose = 25 × 40 = 1,000 mg/day
Maximum Daily Dose = 50 × 40 = 2,000 mg/day
Prescribed Daily Dose = 350 mg × 4 = 1,400 mg/day
The prescribed daily dose of 1,400 mg/day is within the safe range of 1,000 to 2,000 mg/day.
- Calculate the volume to administer per dose
Volume to administer = (Ordered Dose ÷ Concentration) × Volume of Concentration
Volume to administer = (350 ÷ 125) × 5
Volume to administer = 2.8 × 5
Volume to administer = 14 mL
During a home visit, the nurse learns that a client is taking calcium polycarbophil. A single tablet contains 625 mg and the daily maximum dosage is 5 grams in divided doses. How many tablet(s) could the client safely take in one day? (Enter the numeric value only. If rounding is required, round to the nearest whole number.)
Explanation
Calculation:
- Identify the maximum daily dose and tablet strength
Maximum Daily Dose: 5 g (5,000 mg)
Tablet Strength: 625 mg per tablet
- Calculate the maximum number of tablets per day
Number of Tablets = Maximum Daily Dose ÷ Tablet Strength
Number of Tablets = 5,000 ÷ 625
Number of Tablets = 8
A client with an extrapyramidal reaction receives a prescription for diphenhydramine 35 mg intramuscularly. The medication is supplied as 50 mg/mL in a 1 mL prefilled single-use syringe. How many mL should the nurse give? (Enter the numerical value only. If rounding is required, round to the nearest tenth.)
Explanation
Calculation:
- Identify the ordered dose and available concentration
Ordered Dose: 35 mg
Available Concentration: 50 mg/mL
- Calculate the volume to administer
Volume to administer = Ordered Dose ÷ Concentration
Volume to administer = 35 ÷ 50
Volume to administer = 0.7 mL
A client with chronic constipation reports taking 2 ounces of magnesium hydroxide at bedtime. The bottle is labeled "Magnesium Hydroxide Saline Laxative, USP 400 mg/5 mL. How many mL should the nurse document in the medical record? (Enter numerical value only.)
Explanation
Calculation:
- Identify the amount taken
Amount Taken: 2 ounces
- Convert ounces to milliliters
1 ounce = 30 mL
Volume = 2 × 30
Volume = 60 mL
A client receives a prescription for penicillin 5 million units in 100 mL of 0.9% sodium chloride to be infused over 30 minutes. How many mL/hr should the nurse set the infusion pump? (Enter numerical value only.)
Explanation
Calculation:
- Identify the total volume and infusion time
Total Volume: 100 mL
Infusion Time: 30 minutes (0.5 hour)
- Calculate the infusion rate
Infusion Rate = Total Volume ÷ Time
Infusion Rate = 100 ÷ 0.5
Infusion Rate = 200 mL/hr
A client is receiving an IV insulin infusion at 6 units/hour. The IV solution contains regular insulin 200 units in 100 mL of normal saline. The nurse should program the infusion pump to deliver how many mL/hour? (Enter numeric value only.)
Explanation
Calculation:
- Identify the prescribed infusion rate and available concentration
Prescribed Rate: 6 units/hour
Available Concentration: 200 units in 100 mL
- Calculate the concentration per mL
Concentration = 200 units ÷ 100 mL
Concentration = 2 units/mL
- Calculate the infusion pump rate
Infusion Pump Rate = Prescribed Rate ÷ Concentration
Infusion Pump Rate = 6 ÷ 2
Infusion Pump Rate = 3 mL/hr
A child with an infection receives a prescription for cefixime 80 mg by mouth every 12 hours. The bottle is labeled, "Cefixime for Oral Suspension, USP 100 mg per 5 mL". How many mL should nurse administer? (Enter numerical value only.)
Explanation
Calculation:
- Identify the ordered dose and available concentration
Ordered Dose: 80 mg
Available Concentration: 100 mg/5 mL
- Calculate the volume to administer
Volume to administer = (Ordered Dose ÷ Concentration) × Volume of Concentration
Volume to administer = (80 ÷ 100) × 5
Volume to administer = 0.8 × 5
Volume to administer = 4 mL
A client receives a prescription for a continuous IV infusion at the rate of 5 mg/hour of a pre-mixed medication labeled, 100 mg in 250 mL of D5W. How many milliliters of solution should the client receive each hour to provide the prescribed dose? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
Explanation
Calculation:
- Identify the prescribed infusion rate and available concentration
Prescribed Rate: 5 mg/hour
Available Concentration: 100 mg in 250 mL
- Calculate the concentration per mL
Concentration = 100 mg ÷ 250 mL
Concentration = 0.4 mg/mL
- Calculate the infusion pump rate
Infusion Pump Rate = Prescribed Rate ÷ Concentration
Infusion Pump Rate = 5 ÷ 0.4
Infusion Pump Rate = 12.5 mL/hr
A client receives a prescription for a fluid bolus of 0.9% sodium chloride, USP 250 mL to be infused in 30 minutes. How many mL/hr should the nurse program the infusion pump to deliver? (Enter numerical value only.)
Explanation
Calculation:
- Identify the total volume and infusion time
Total Volume: 250 mL
Infusion Time: 30 minutes (0.5 hour)
- Calculate the infusion rate
Infusion Rate = Total Volume ÷ Time
Infusion Rate = 250 ÷ 0.5
Infusion Rate = 500 mL/hr
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