A nurse is preparing to administer ampicillin 500 mg IM every 6 hr. Available is ampicillin 500 mg vial. The package insert instructs adding 1.8 mL of sterile water to yield ampicillin 250 mg/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.)
The Correct Answer is ["2"]
To calculate the amount of ampicillin the nurse should administer per dose in milliliters (mL) for a 500 mg IM dose, we can use the following steps:
Given:
Ampicillin dose: 500 mg
Available concentration after reconstitution: 250 mg/mL
Volume of sterile water to be added: 1.8 mL
Step 1: Calculate the amount of ampicillin to be administered per dose in mL
First, we need to reconstitute the ampicillin vial to yield the desired concentration of 250 mg/mL.
The concentration after reconstitution is 250 mg/mL, and the total dose required is 500 mg. Therefore, the nurse needs to administer:
Volume = Ampicillin dose / Concentration
Volume = 500 mg / 250 mg/mL
Volume = 2 mL
Rounding to the nearest whole number:
Volume = 2 mL
Therefore, the nurse should administer 2 mL of the reconstituted ampicillin solution per dose.
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Related Questions
Correct Answer is ["2"]
Explanation
To calculate the amount of ampicillin the nurse should administer per dose in milliliters (mL) for a 500 mg IM dose, we can use the following steps:
Given:
Ampicillin dose: 500 mg
Available concentration after reconstitution: 250 mg/mL
Volume of sterile water to be added: 1.8 mL
Step 1: Calculate the amount of ampicillin to be administered per dose in mL
First, we need to reconstitute the ampicillin vial to yield the desired concentration of 250 mg/mL.
The concentration after reconstitution is 250 mg/mL, and the total dose required is 500 mg. Therefore, the nurse needs to administer:
Volume = Ampicillin dose / Concentration
Volume = 500 mg / 250 mg/mL
Volume = 2 mL
Rounding to the nearest whole number:
Volume = 2 mL
Therefore, the nurse should administer 2 mL of the reconstituted ampicillin solution per dose.
Correct Answer is ["125"]
Explanation
To calculate the rate at which the nurse should set the IV pump to deliver dextrose 5% in 0.45% sodium chloride over 24 hours, we can use the following steps:
Given:
Total IV fluid volume: 3 L
Infusion duration: 24 hours
Step 1: Convert the total IV fluid volume from liters (L) to milliliters (mL)
Total volume = 3 L × 1000 mL/L
Total volume = 3000 mL
Step 2: Calculate the rate of infusion per hour
Rate = Total volume / Infusion duration
Rate = 3000 mL / 24 hr
Rate ≈ 125 mL/hr
Rounding to the nearest whole number:
Rate ≈ 125 mL/hr
Therefore, the nurse should set the IV pump to deliver approximately 125 mL/hr for the infusion of dextrose 5% in 0.45% sodium chloride over 24 hours.
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