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NurseDive Free Nursing Practice Question
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.). mL. .
This question is an excerpt from Nurse Dive's nursing test bank - ATI RN Dosage Calculation Proctored Exam. Take the full exam now
Full Explanation
Step 1: Calculate the volume of cefazolin needed for a 250 mg dose.
Volume of cefazolin = 250 mg ÷ 225 mg/mL = 1.11 mLStep 2: Round the answer to the nearest tenth.
1.11 mL rounded to the nearest tenth is 1.1 mL.Therefore, the nurse should add 1.1 mL of cefazolin to the 50 mL of 0.9% sodium chloride.
Similar Questions
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.)
Full Explanation
Step 1 is to convert the client’s weight from pounds to kilograms since the medication dosage is prescribed in mg/kg. Given that 1 kg is approximately 2.2 lb, the conversion is:
210 lb ÷ 2.2 = 95.45 kg (rounded to the nearest hundredth).
Step 2 is to calculate the total amount of medication needed using the formula:
Dose (mg/kg) × Weight (kg) = Total medication needed (mg)
5 mg/kg × 95.45 kg = 477.27 mg (rounded to the nearest hundredth).
Step 3 is to calculate the volume to administer using the formula:
Total medication needed (mg) ÷ Concentration (mg/mL) = Volume to administer (mL)
477.27 mg ÷ 10 mg/mL = 47.73 mL
Rounding off to the nearest whole number, the nurse should administer 48 mL of gentamicin.
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.)
Full Explanation
Step 1 is to calculate the volume to administer using the formula:
Dose (mg) ÷ Concentration (mg/mL)
Given that the prescribed dose is 1.5 mg and the available concentration is 1 mg/mL, we calculate:
1.5 mg ÷ 1 mg/mL = 1.5 mL
Since the result is already rounded to the nearest tenth, the nurse should administer 1.5 mL of oxymorphone.
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.)
Full Explanation
Step 1 is to convert the client’s weight from pounds to kilograms. Given that 1 kg = 2.2 lb, we calculate:
183 lb ÷ 2.2 = 83.18 kg
Rounding to the nearest hundredth, the client’s weight is 83.18 kg.
Step 2 is to calculate the total amount of medication needed. The prescribed dosage is 0.1 mg/kg, so we calculate:
0.1 mg/kg × 83.18 kg = 8.32 mg
Rounding to the nearest hundredth, the total medication required is 8.32 mg.
Step 3 is to determine the volume to administer. The available concentration of furosemide is 10 mg/mL, so we divide:
8.32 mg ÷ 10 mg/mL = 0.832 mL
Rounding to the nearest tenth, the correct amount to administer is 0.8 mL.