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ATI RN Adult Medical Surgical Assessment Dosage Calculations 3.1 Exam with Worked Answers
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ATI RN Adult Medical Surgical Assessment Dosage Calculations 3.1 Exam with Worked Answers
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ATI RN Adult Medical Surgical Assessment Dosage Calculations 3.1 Exam with Worked Answers Question 1: A nurse is preparing to administer heparin 7,500 units subcutaneous. Available is heparin 10,00 0 units/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 volume of heparin (in milliliters) to administer, you can use the following formula: Volume (mL) = Desired dose (units) / Concentration (units/mL) In this case, the desired dose is 7,500 units, and the concentration is 10,000 units/mL. Volume (mL) = 7,500 units / 10,000 units/mL Volume (mL) = 0.75 mL So, the nurse should administer 0.75 mL of heparin. Question 2: A nurse is preparing to administer metronidazole 7.5 mg/kg via intermittent IV bolus to a client who weighs 212 lb. Available is metronidazole 5 00 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.) Explanation To calculate the dose of metronidazole for a client who weighs 212 lb, the nurse needs to convert the weight to kilograms and multiply it by the prescribed dose of 7.5 mg/kg. One kilogram is equal to 2.2 lb, so the client's weight in kilograms is 212/2.2 = 96.36 kg. The dose of metronidazole in milligrams is 96.36 x 7.5 = 722.7 mg. The nurse needs to find out how many mL of the available solution contain this amount of metronidazole. The available solution has a concentration of 500 mg/100 mL, so the nurse can use a proportion to solve for the volume: 500/100 = 722.7/x. Cross -multiplying and solving for x gives x = 722.7 x = 144.54 mL. The nurse should round the answer to the nearest whole number, so the final answer is 145 mL. The nurse should administer 145 mL of metronidazole via intermittent IV bolus to the client. Question 3: A nurse is preparing to administer megestrol 200 mg PO to a client. Available is megestrol oral suspension 40 mg/mL. How many ml should the nurse administer? (Round t he answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.) Explanation To calculate the volume of megestrol oral suspension (in milliliters, mL) that the nurs e should administer, use the following formula: Volume (mL) = Dose (mg) / Concentration (mg/mL) In this case, the dose is 200 mg of megestrol, and the concentration of the oral suspension is 40 mg/mL. Volume (mL) = 200 mg / 40 mg/mL Volume (mL) = 5 mL The nurse should administer 5 mL of megestrol oral suspension to the client. Question 4: A nurse is caring for a client who has a new prescription for sotalol 320 mg/day in two divided doses. The amount available is 80 mg tablets. How many tablets should the nurse administer with each dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.) Explanation To determine how many tablets of sotalol the nurse should administer with each dose, you can use the following calculation: Total daily dose / Number o f doses per day = Dose per administration In this case, the total daily dose is 320 mg, and it's divided into two doses per day. 320 mg / 2 doses = 160 mg per administration Now, you know that the nurse should administer 160 mg of sotalol with each dose. T he available tablets are 80 mg each, so you can calculate how many tablets are needed: Dose per administration / Tablet strength = Number of tablets 160 mg / 80 mg/tablet = 2 tablets Therefore, the nurse should administer 2 tablets of sotalol with each dos e. Question 5: A nurse is preparing to administer morphine 0.1 mg/kg IM to a client who weighs 99 lb. Available is morphine 2 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 amount of morphine (in mL) the nurse should administer, follow these steps: Step 1: Convert the client's weight from pounds to kilograms. 99 lb / 2.2 lb/kg ≈ 45 kg (rounded to the nearest whole number) Step 2: Calculate the total dose based on the client's weight. 0.1 mg/kg * 45 kg = 4.5 mg Step 3: Determine how many mL of the available morphine solution (2 mg/mL) are needed to achieve the prescribed dose. 4.5 mg ÷ 2 mg/mL = 2.25 mL Rounded to the nearest tenth, the nurse should administer 2.3 mL of morphine. Question 6: A nurse is preparing to administer dextrose 5% in water 1,000 mL IV to infuse over 6 hr. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the neares t whole number. Use a leading zero if it applies. Do not use a trailing zero.) Explanation To calculate the infusion rate in mL/hr for dextrose 5% in water 1,000 mL over 6 hours, you can use the following formula: Infusi on Rate (mL/hr) = Total Volume (mL) / Total Time (hr) Infusion Rate = 1,000 mL / 6 hr ≈ 166.67 mL/hr Rounded to the nearest whole number, the nurse should set the IV pump to deliver approximately 167 mL/hr. Question 7: A nurse is preparing to administer acetaminophen 650 mg PO to a client for pain. Available is acetaminophen liquid 160 mg/5 mL. How many ml should the nurse administer? (Round the answer to th e nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.) Explanation To calculate the amount of acetaminophen liquid to administer, you can use the following formula: Amount (mL) = (Desired Dose in mg) / (Concentration in mg/mL) Amount (mL) = 650 mg / (160 mg/5 mL) = 20.31 mL Rounded to the nearest tenth, the nurse should administer approximately 20.3 mL of acetaminophen liquid. 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