Dosage Calculation RN Adult Medical Surgical Proctored Assessment 3
Total Questions : 36
Showing 25 questions, Sign in for moreA nurse is preparing to administer enoxaparin 40 mg subcutaneous for prevention of deep vein thrombosis. Available is enoxaparin 100 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dose of enoxaparin, use the formula: Dose (mg) / Concentration (mg/mL)
= Volume (mL)
Plug in the values from the question: 40 mg / 100 mg/mL = 0.4 mL
Round the answer to the nearest tenth: 0.4 mL
The nurse should administer 0.4 mL of enoxaparin subcutaneously for prevention of deep vein thrombosis.
A nurse is preparing to administer amikacin 5 mg/kg via intermittent IV bolus to a client who weighs 219 lb. Available is amikacin 10 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Convert the client's weight from pounds to kilograms: 219 lb / 2.2 = 99.55 kg
Calculate the dose of amikacin in milligrams: 5 mg/kg x 99.55 kg = 497.75 mg
Calculate the volume of amikacin in milliliters: 497.75 mg / 10 mg/mL = 49.775 mL
Round the answer to the nearest whole number: 50 mL
The nurse should administer 50 mL of amikacin via intermittent IV bolus.
A nurse is preparing to administer calcitonin 8 units/kg IM to a client who weighs 130 lb.
Available is calcitonin 200 units/mL for injection. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Convert the client's weight from pounds to kilograms: 130 lb / 2.2 = 59.09 kg
Calculate the dose of calcitonin in units: 8 units/g x 59.09 kg = 472.72 units
Calculate the volume of injection in mL: 472.72 units / 200 units/mL = 2.36 mL
Round the answer to the nearest tenth: 2.4 mL
The nurse should administer 2.4 mL of calcitonin IM to the client.
A nurse is preparing to administer lactated Ringer’s 250 mL IV to infuse over 15 min. 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.)
Explanation
To calculate the infusion rate, use the formula: mL/hr = (mL x drop factor) / time in minutes
In this case, mL = 250, drop factor = 60 (assuming microdrip tubing), and time = 15 minutes
Plug in the values and simplify: mL/hr = (250 x 60) / 15 - mL/hr = 1000
The nurse should set the IV pump to deliver 1000 mL/hr
A nurse is preparing to administer phenytoin extended release 300 mg PO daily. Available is phenytoin 100 mg capsules. How many capsules should the nurse administer?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the number of capsules, divide the prescribed dose by the available dose: 300 mg / 100 mg = 3 capsules
The nurse should administer 3 capsules of phenytoin 100 mg each to provide the daily dose of 300 mg
A nurse is teaching a client who has a new prescriptio for sucralfate 1 g PO BID. Available is sucralfate 1 g/10 mL. How many tsp should the nurse instruct the client to self-administer per dose?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dose of sucralfate, divide the prescribed amount by the concentration of the liquid form.
For example, 1 g / (1 g/10 mL) = 10 mL
To convert milliliters to teaspoons, multiply by 0.2
For example, 10 mL x 0.2 = 2 tsp
Therefore, the nurse should instruct the client to self-administer 2 tsp of sucralfate per dose.
A nurse is preparing to administer dextrose 5% in lactated Ringer’s 2 L IV to infuse over 12 hr.
The drop factor on the manual IV tubing is 20 gtt/mL. The nurse should set the IV flow rate to deliver how many gtt/min?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the IV flow rate, use the formula: gtt/min = (volume in mL x drop factor in gtt/mL) / time in min
Plug in the given values: gtt/min = (2000 mL x 20 gtt/mL) / 720 min
Simplify and solve: gtt/min = 40000 gtt / 720 min
Divide both sides by 10: gtt/min = 4000 gtt / 72 min
Divide both sides by 4: gtt/min = 1000 gtt / 18 min
Divide both sides by 5: gtt/min = 200 gtt / 3.6 min
Divide both sides by 2: gtt/min = 100 gtt / 1.8 min
The answer is approximately 55.6 gtt/min, so round it to the nearest whole number: 56 gtt/min
A nurse is preparing to administer ceftriaxone 1 g by intermittent IV bolus over 45 min.
Available is ceftriaxone 1 g in 0.9% sodium chloride 100 mL. The drop factor on the manual I tubing is 15 gtt/mL. The nurse should set the IV flow rate to deliver how many gtt/min?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the IV flow rate, use the formula: gtt/min = (Volume x Drop factor) / Time
Plug in the values from the question: gtt/min = (100 mL x 15 gtt/mL) / 45 min
Simplify and solve: gtt/min = 1500 gtt / 45 min
Divide both sides by 45: gtt/min = 33.33 gtt/min
Round to the nearest whole number: gtt/min = 33 gtt/min
The nurse should set the IV flow rate to deliver 33 gtt/min
A nurse is preparing to administer digoxin 750 mcg IV bolus. How many mg should the nurse administer?
(Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Convert mcg to mg by dividing by 1000
- 750 mcg / 1000 = 0.75 mg
Round the answer to the nearest hundredth
The nurse should administer 0.75 mg of digoxin IV bolus
A nurse is preparing to administer cefazolin 1 g intermittent IV bolus in 0.9% sodium chloride 250 ml over 30 min. The drop factor on the manual IV tubing is 10 gtt/mL. The nurse should set the manual IV flow rate to deliver how many gtt/min?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the manual IV flow rate, use the formula: gtt/min = (volume in mL x drop factor in gtt/mL) / time in min
Substitute the given values into the formula: gtt/min = (250 mL x 10 gtt/mL) / 30 min
Simplify and solve for gtt/min: gtt/min = 2500 gtt / 30 min
Divide both sides by 30: gtt/min = 83.33 gtt/min
Round the answer to the nearest whole number: gtt/min = 83 gtt/min
The nurse should set the manual IV flow rate to deliver 83 gtt/min
A nurse is preparing to administer ketorolac 30 mg IM to a client. Available is ketorolac injection 15 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dosage of ketorolac, use the formula: D (desired dose) / H (have dose) = V (volume to be administered)
Plug in the values from the question: 30 mg / 15 mg/mL = 2 mL
Round the answer to the nearest whole number: 2 mL
The nurse should administer 2 mL of ketorolac injection to the client
A nurse is preparing to administer naloxone 10 mcg/kg IM to a client who weighs 165 lb.
Available is naloxone 0.4 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculate the dose of naloxone in micrograms: 10 mcg/kg x 75 kg = 750 mcg
Convert the dose of naloxone from micrograms to milligrams: 750 mcg / 1000 = 0.75 mg
Calculate the volume of naloxone in milliliters: 0.75 mg / 0.4 mg/mL = 1.875 mL
Round the answer to the nearest tenth: 1.9 mL
The nurse should administer 1.9 mL of naloxone IM to the client.
A nurse is preparing to administer furosemide 0.1 mg/kg via IV bolus to a client who weighs 183 lb. Available is furosemide 10 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Convert the client's weight from pounds to kilograms: 183 lb / 2.2 = 83.18 kg
Calculate the dose of furosemide in mg: 0.1 mg/kg x 83.18 kg = 8.32 mg
Calculate the volume of furosemide in mL: 8.32 mg / 10 mg/mL = 0.832 mL
Round the answer to the nearest tenth: 0.8 mL
The nurse should administer 0.8 mL of furosemide via IV bolus.
A nurse is preparing to administer dextrose 5% in 0.45% sodium chloride 1 L with magnesium sulfate 1 g to infuse IV bolus over 12 hr. 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.)
Explanation
To calculate the infusion rate, divide the total volume by the total time in hours: 1 L / 12 hr = 83.33 mL/hr
Round the answer to the nearest whole number: 83 mL/hr
The nurse should set the IV pump to deliver 83 mL/hr
A nurse is preparing to administer exenatide 10 mcg subcutaneous. Available is exenatide 250 mcg/mL. How many mL should the nurse administer?
(Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dose of exenatide, use the formula: Dose (mL) = Ordered dose (mcg) / Available dose (mcg/mL)
Plug in the values from the question: Dose (mL) = 10 mcg / 250 mcg/mL
Simplify the fraction: Dose (mL) = 0.04 mL
Round the answer to the nearest hundredth: Dose (mL) = 0.04 mL
The nurse should administer 0.04 mL of exenatide subcutaneously.
A nurse is preparing to administer hydrochlorothiazide 150 mg PO daily in 3 equally divided doses. Available is hydrochlorothiazide oral solution 50 mg/5 mL. How many mL should the nurse administer per dose?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculate the total amount of hydrochlorothiazide needed for one day: 150 mg / day
Divide the total amount by the number of doses per day: 150 mg / day / 3 doses / day = 50 mg / dose
Convert the dose from mg to mL using the concentration of the oral solution: 50 mg / dose x 5 mL / 50 mg = 5 mL / dose
Round the answer to the nearest whole number: 5 mL / dose
Administer 5 mL of hydrochlorothiazide oral solution per dose
A nurse is preparing to administer gentamicin 5 mg/kg via intermittent IV bolus to a client who weighs 210 lb. The amount available is gentamicin 10 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Convert the client's weight from pounds to kilograms: 210 lb / 2.2 = 95.45 kg
Calculate the dose of gentamicin in milligrams: 5 mg/kg x 95.45 kg = 477.25 mg
Calculate the volume of gentamicin in milliliters: 477.25 mg / 10 mg/mL = 47.725 mL
Round the answer to the nearest whole number: 48 mL
The nurse should administer 48 mL of gentamicin via intermittent IV bolus.
A nurse is preparing to administer 0.9% sodium chloride 1,200 mL IV to infuse over 8 hr.
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.)
Explanation
To calculate the infusion rate, divide the total volume by the total time.
0.9% sodium chloride 1,200 mL IV / 8 hr = 150 mL/hr
The nurse should set the IV pump to deliver 150 mL/hr.
A nurse is preparing to administer morphine oral solution 30 mg PO for breakthrough pain to a client who has cancer. Available is morphine oral solution 20 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculate the dose of morphine oral solution using the formula: Dose (mL) = Ordered dose (mg) / Available concentration (mg/mL).
In this case, the dose is 30 mg / 20 mg/mL = 1.5 mL.
Round the answer to the nearest tenth. The rounded dose is 1.5 mL.
A nurse is preparing to administer heparin 17,500 units subcutaneous every 12 hr. Available is heparin injection 20,000 units/mL. How many mL should the nurse administer per dose?
(Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dose, use the formula: Dose (mL) = Ordered dose (units) / Available dose (units/mL)
Plug in the values: Dose (mL) = 17,500 units / 20,000 units/mL
Simplify and round: Dose (mL) = 0.88 mL
The nurse should administer 0.88 mL of heparin per dose.
A nurse is preparing to administer acetaminophen 300 mg PO every 4 hr PRN headache.
Available is acetaminophen liquid 160 mg/5 mL. How many mL should the nurse administer per dose?
(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a
trailing zero.)
Explanation
To calculate the dose of acetaminophen liquid, use the formula: Dose (mL) = Ordered dose (mg) / Concentration (mg/mL)
Substitute the values in the formula: Dose (mL) = 300 mg / (160 mg/5 mL)
Simplify and solve for Dose (mL): Dose (mL) = 300 mg x 5 mL / 160 mg
Dose (mL) = 9.375 mL
Round the answer to the nearest tenth: Dose (mL) = 9.4 mL
The nurse should administer 9.4 mL of acetaminophen liquid per dose.
A nurse is preparing to administer oxymorphone 1.5 mg IM to a client. Available is oxymorphone 1 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dosage of oxymorphone, use the formula: D (desired dose) / H (have dose) x V (volume) = A (amount to administer)
In this case, D = 1.5 mg, H = 1 mg/mL, and V = 1 mL
Plug in the values and solve for A: A = (1.5 mg / 1 mg/mL) x 1 mL = 1.5 mL
Round the answer to the nearest tenth: A = 1.5 mL
The nurse should administer 1.5 mL of oxymorphone to the client
A nurse is preparing to administer lorazepam 0.05 mg/kg via IV bolus to a client who weighs 175 lb. Available is lorazepam 2 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Convert the client's weight from pounds to kilograms: 175 lb / 2.2 = 79.55 kg
Calculate the dose of lorazepam in mg: 0.05 mg/kg x 79.55 kg = 3.98 mg
Calculate the volume of lorazepam in mL: 3.98 mg / 2 mg/mL = 1.99 mL
Round the answer to the nearest whole number: 2 mL
The nurse should administer 2 mL of lorazepam via IV bolus.
A nurse is preparing to administer amoxicillin 775 mg PO. Available is amoxicillin oral suspension 400 mg/5 mL. How many mL should the nurse administer?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dose of amoxicillin oral suspension, use the formula: Dose (mL) = Desired (mg) / Available (mg/mL) x Volume (mL)
Plug in the values from the question: Dose (mL) = 775 mg / (400 mg/5 mL) x 5 mL
Simplify and solve: Dose (mL) = 9.6875 mL
Round to the nearest whole number: Dose (mL) = 10 mL
The nurse should administer 10 mL of amoxicillin oral suspension.
A nurse is preparing to administer promethazine 12.5 mg IM. Available is promethazine 25 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dosage, use the formula: D (desired dose) / H (have dose) x V (vehicle)
In this case, D = 12.5 mg, H = 25 mg, and V = 1 mL
Plug in the values and solve: 12.5 / 25 x 1 = 0.5 mL
Round the answer to the nearest tenth: 0.5 mL
The nurse should administer 0.5 mL of promethazine IM
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