ATI RN
ATI Dosage Calculation RN Adult Medical Surgical Questions
Question 1 of 5
A nurse is preparing to administer pentamidine 4 mg/kg IM to a client who weighs 154 lb. Available is pentamidine 100 mg/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.)
Correct Answer: 2.8 mL
Rationale: Convert weight: 154 lb ÷ 2.2 = 70 kg. Calculate dose: 4 mg/kg × 70 kg = 280 mg. Determine volume: 280 mg ÷ 100 mg/mL = 2.8 mL.
Question 2 of 5
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.)
Correct Answer: 5 mL
Rationale:
Total daily dose: 150 mg. Per dose: 150 mg ÷ 3 = 50 mg. Volume: 50 mg ÷ (50 mg/5 mL) = 5 mL.
Question 3 of 5
A nurse is preparing to administer morphine 7.5 mg subcutaneous. Available is morphine injection 10 mg/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.)
Correct Answer: 0.75 mL
Rationale: Volume: 7.5 mg ÷ 10 mg/mL = 0.75 mL.
Question 4 of 5
A nurse is preparing to administer cefazolin 250 mg via intermittent IV bolus every 8 hr. Available is cefazolin 500 mg vial. The package insert instructs to add 2 mL of sterile water to yield a concentration of 225 mg/mL and then add to 50 mL of 0.9% sodium chloride. How many mL of cefazolin should the nurse add to the 50 mL of 0.9% sodium chloride?(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Correct Answer: 1.1 mL
Rationale: Volume: 250 mg ÷ 225 mg/mL = 1.111 mL, rounded to 1.1 mL.
Question 5 of 5
A nurse is preparing to administer rifampin 20 mg/kg/day PO in two divided doses to a client who weighs 132 lb and has tuberculosis. The amount available is rifampin 150 mg capsules. How many capsules 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.)
Correct Answer: 4 capsules
Rationale: Weight: 132 lb ÷ 2.2 = 59.9 kg. Daily dose: 20 mg/kg/day × 59.9 kg = 1198 mg. Per dose: 1198 mg ÷ 2 = 599 mg. Capsules: 599 mg ÷ 150 mg = 3.993, rounded to 4.