ATI RN Dosage calculation
Total Questions : 35
Showing 25 questions, Sign in for moreA 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.). mL/hr.
Explanation
Step 1 is to calculate the total volume to be infused in mL/hr. This is done by dividing the total volume (250 mL) by the time in hours (15 min ÷ 60 min/hr). So, 250 mL ÷ (15 min ÷ 60 min/hr) = 1000 mL/hr.
So, the correct answer is 1000 mL/hr.
A nurse is preparing to administer cefazolin 1g 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.). gtt/min.
Explanation
Step 1 is to calculate the total volume to be infused in mL/min. This is done by dividing the total volume (250 mL) by the time in minutes (30 min). So, 250 mL ÷ 30 min = 8.33 mL/min. Step 2 is to convert mL/min to gtt/min using the drop factor. So, (8.33 mL/min) × (10 gtt/mL) = 83.3 gtt/min. Round off to the nearest whole number, the correct answer is 83 gtt/min.
A nurse is preparing to reconstitute ampicillin for IM administration to a client who has urethritis.
Which of the following information should the nurse interpret from the medication label? (Refer to the medication label below.). *This vial contains ampicillin sodium equivalent to 1 gram ampicillin.
For IM use, add 3.5 ml diluent (read accompanying insert). Resulting solution contains 250 mg ampicillin per mL. Use solution within 1 hour.
Usage dosage: Adults-250 to 500 mg IM qóh. READ ACCOMPANYING INSERT.
T tor. detailed indications, IM or IV dosage, and precautions.
Store the dry powder at 20° to 25° C (68° to 77° F) (See USP]). NDC 1234-1234-10. Ampicillin for Injection, UŠP. 1 gram per vial.
For IM or IV Use.
End of label.
Explanation
Choice A rationale:
The label states to add 3.5 mL of diluent for reconstitution, not 5 mL. So, choice A is incorrect.
Choice B rationale:
After reconstitution, the vial will contain 1 gram of medication, not 500 mg. So, choice B is incorrect.
Choice C rationale:
The label does state to use the solution within 1 hour of reconstitution. So, choice C is correct.
Choice D rationale:
The label states the medication can be used for IM or IV, not only IM. So, choice D is incorrect.
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.). mL.
Explanation
Step 1 is to determine the amount of medication needed. The order is for 30 mg and the available medication is 15 mg/mL. So, we calculate 30 mg ÷ 15 mg/mL = 2 mL. So the correct answer is 2 mL.
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.). mL.
Explanation
Step 1 is to determine the amount of medication needed. The order is for 30 mg and the available medication is 20 mg/mL. So, we calculate 30 mg ÷ 20 mg/mL = 1.5 mL. Rounded to the nearest tenth, this is 1.5 mL. So the correct answer is 1.5 mL.
A nurse is teaching a client who has a new prescription 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.). tsp.
Explanation
Step 1 is to determine the amount of medication needed. The order is for 1 g and the available medication is 1 g/10 mL. So, we calculate 1 g ÷ 1 g/10 mL = 10 mL. Since 1 tsp is approximately 5 mL, we then calculate 10 mL ÷ 5 mL/tsp = 2 tsp. So the correct answer is 2 tsp.
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.). mL/hr.
Explanation
Step 1 is to calculate the total volume to be infused. The total volume is 1 L, which is equal to 1000 mL. Step 2 is to divide the total volume by the total time. The total time is 12 hours. So, the calculation is 1000 mL ÷ 12 hr = 83.33 mL/hr.
So, the correct answer is 83 mL/hr, after rounding to the nearest whole number.
A nurse is reviewing medications prescribed for a client.
For which of the following prescriptions should the nurse contact the provider for clarification?.
Explanation
Choice A rationale:
Meloxicam 15 mg PO daily is a standard dose for treating osteoarthritis and rheumatoid arthritis.
Choice B rationale:
Regular insulin 8 units subcutaneous before meals is a typical dose for managing blood glucose levels in diabetes.
Choice C rationale:
Docusate sodium 200 mg PO at bedtime is a common dose for preventing constipation.
Choice D rationale:
Fentanyl 25 mcg/hr transdermal patch is a potent opioid, and the dose should be carefully monitored. If the client has not been on opioid therapy, this dose might be too high.
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.). mL. .
Explanation
Step 1 is to calculate the total daily dose. The total daily dose is 150 mg. Step 2 is to divide the total daily dose by the number of doses. The number of doses is 3. So, the calculation is 150 mg ÷ 3 = 50 mg/dose. Step 3 is to calculate the volume to administer using the available medication concentration. The available medication concentration is 50 mg/5 mL. So, the calculation is 50 mg ÷ (50 mg/5 mL) = 5 mL.
So, the correct answer is 5 mL, after rounding to the nearest whole number.
A nurse is preparing to administer acetylcysteine 140 mg/kg PO stat to a client who weighs 178 lb. Available is acetylcysteine 200 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.). mL.
Explanation
Step 1 is to convert the client’s weight from pounds to kilograms. We know that 1 kg is approximately 2.2 lb. So, the client’s weight in kg is 178 lb ÷ 2.2 lb/kg = 80.91 kg. Step 2 is to calculate the total dose of acetylcysteine. The total dose is 140 mg/kg × 80.91 kg = 11327.4 mg. Step 3 is to calculate the volume to administer. The volume is 11327.4 mg ÷ 200 mg/mL = 56.637 mL.
So, the correct answer is 57 mL after rounding to the nearest whole number.
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.). mL.
Explanation
Step 1 is to convert the client’s weight from pounds to kilograms. So, the client’s weight in kg is 175 lb ÷ 2.2 lb/kg = 79.55 kg. Step 2 is to calculate the total dose of lorazepam. The total dose is 0.05 mg/kg × 79.55 kg = 3.9775 mg. Step 3 is to calculate the volume to administer. The volume is 3.9775 mg ÷ 2 mg/mL = 1.98875 mL.
So, the correct answer is 2 mL after rounding to the nearest whole number.
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.). mL. .
Explanation
Step 1 is to calculate the volume to administer. The volume is 775 mg ÷ (400 mg/5 mL) = 9.6875 mL.
So, the correct answer is 10 mL after rounding to the nearest whole number.
A nurse is preparing to administer ceftriaxone 250 mg IM to an adult client who has a gonococcal infection.
The label on the vial indicates to reconstitute each vial with sterile water 2.1 mL to yield ceftriaxone 350 mg/mL. How many mL of the reconstituted medication should the nurse administer? (Round the answer to the nearest hundredth.
Use a leading zero if it applies.
Do not use a trailing zero.). mL.
Explanation
Step 1 is to calculate the amount of medication per mL. This is done by dividing the total amount of medication (250 mg) by the concentration (350 mg/mL). So, 250 mg ÷ 350 mg/mL = 0.71 mL.
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.). mg.
Explanation
Step 1 is to convert mcg to mg. This is done by dividing the total amount of medication (750 mcg) by 1000 (since 1 mg = 1000 mcg). So, 750 mcg ÷ 1000 = 0.75 mg.
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.). gtt/min.
Explanation
Step 1 is to calculate the total volume to be infused in minutes. This is done by multiplying the total volume (2000 mL) by the drop factor (20 gtt/mL), and then dividing by the total time (12 hr × 60 min/hr). So, (2000 mL × 20 gtt/mL) ÷ (12 hr × 60 min/hr) = 55.56 gtt/min, which rounds to 56 gtt/min.
A nurse is preparing to administer acetaminophen 15 mg/kg via intermittent IV bolus to a client who weighs 99 lb. The amount available is acetaminophen 1,000 mg/100 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.). mL.
Explanation
Step 1 is to convert the client’s weight from pounds to kilograms since the dosage is prescribed in mg/kg. We know that 1 kg is approximately 2.2 lb. So, the client’s weight in kg is 99 lb ÷ 2.2 = 45 kg (rounded to the nearest whole number). Step 2 is to calculate the total dosage of acetaminophen required. The prescribed dosage is 15 mg/kg, so the total dosage is 15 mg/kg × 45 kg = 675 mg. Step 3 is to calculate the volume to administer. The available medication is in a concentration of 1,000 mg/100 mL, which is the same as 10 mg/mL. So, the volume to administer is 675 mg ÷ 10 mg/mL = 67.5 mL. Rounding to the nearest whole number, the nurse should administer 68 mL.
So, the correct answer is 68 mL.
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.). mL.
Explanation
Step 1 is to convert the client’s weight from pounds to kilograms. The client’s weight in kg is 219 lb ÷ 2.2 = 99.5 kg (rounded to the nearest whole number). Step 2 is to calculate the total dosage of amikacin required. The prescribed dosage is 5 mg/kg, so the total dosage is 5 mg/kg × 99.5 kg = 498 mg. Step 3 is to calculate the volume to administer. The available medication is in a concentration of 10 mg/mL. So, the volume to administer is 498 mg ÷ 10 mg/mL = 49.8 mL. Rounding to the nearest whole number, the nurse should administer 50 mL.
So, the correct answer is 50 mL.
A 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.). mL. .
Explanation
The prescribed dosage of enoxaparin is 40 mg. The available medication is in a concentration of 100 mg/mL. So, the volume to administer is 40 mg ÷ 100 mg/mL = 0.4 mL. Rounding to the nearest tenth, the nurse should administer 0.4 mL.
So, the correct answer is 0.4 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.). mL.
Explanation
Step 1 is to calculate the volume of heparin to be administered. The calculation is as follows: 17,500 units ÷ (20,000 units/mL) = 0.875 mL.
So, the correct answer is 0.88 mL (rounded to the nearest hundredth).
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.). mL.
Explanation
Step 1 is to convert the client’s weight from pounds to kilograms (1 kg = 2.2 lb). The calculation is as follows: 165 lb ÷ 2.2 = 75 kg. Step 2 is to calculate the volume of naloxone to be administered. The calculation is as follows: (10 mcg/kg × 75 kg) ÷ (0.4 mg/mL × 1000 mcg/mg) = 1.875 mL.
So, the correct answer is 1.9 mL (rounded to the nearest tenth).
A nurse is preparing to administer tobramycin 3 mg/kg/day IM in three divided doses to a client who weighs 85 kg. The amount available is tobramycin 40 mg/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.). mL. .
Explanation
Step 1 is to calculate the volume of tobramycin to be administered per dose. The calculation is as follows: (3 mg/kg/day × 85 kg) ÷ (3 doses/day × 40 mg/mL) = 1.0625 mL.
So, the correct answer is 1.1 mL (rounded to the nearest tenth).
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.). capsule(s).
Explanation
Step 1 is to determine the total amount of medication needed. The doctor ordered 300 mg of phenytoin and each capsule contains 100 mg. So, we divide the total amount ordered by the amount per capsule: 300 mg ÷ 100 mg/capsule = 3 capsules.
So, the correct answer is 3 capsules.
A nurse is preparing to administer calcitonin & 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.). mL.
Explanation
Step 1 is to convert the client’s weight from pounds to kilograms since the dosage is ordered in units/kg. There are approximately 2.2 lb/kg, so 130 lb ÷ 2.2 lb/kg = 59.1 kg. The doctor ordered calcitonin at a dosage of & units/kg, so we multiply the client’s weight in kg by the dosage: 59.1 kg × & units/kg = & units. The medication is available at a concentration of 200 units/mL, so we divide the total units needed by the units per mL: & units ÷ 200 units/mL = & mL.
So, the correct answer is & mL.
A nurse is preparing to administer phenobarbital 2 mg/kg/day IV divided in 2 equal doses to a client who weighs 165 lb. Available is phenobarbital 65 mg/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.). mL. .
Explanation
Step 1 is to convert the client’s weight from pounds to kilograms since the dosage is ordered in mg/kg. There are approximately 2.2 lb/kg, so 165 lb ÷ 2.2 lb/kg = 75 kg. The doctor ordered phenobarbital at a dosage of 2 mg/kg/day divided into 2 equal doses, so we multiply the client’s weight in kg by the dosage and divide by 2: (75 kg × 2 mg/kg/day) ÷ 2 = 75 mg/dose. The medication is available at a concentration of 65 mg/mL, so we divide the total mg needed per dose by the mg per mL: 75 mg ÷ 65 mg/mL = 1.15 mL.
So, the correct answer is 1.2 mL.
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.). mL.
Explanation
Step 1 is to find out how many mcg are in 1 mL. This is done by dividing the total amount of mcg available (250 mcg) by the total volume in mL (1 mL). So, 250 mcg ÷ 1 mL = 250 mcg/mL. Step 2 is to find out how many mL are needed to get 10 mcg. This is done by dividing the required amount in mcg (10 mcg) by the concentration in mcg/mL (250 mcg/mL). So, 10 mcg ÷ 250 mcg/mL = 0.04 mL. So the correct answer is 0.04 mL.
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