A nurse is preparing to administer ceftriaxone 400 mg IM to an infant in two divided doses. Available is ceftriaxone injection 500 mg/2 mL. How many total 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.)
The Correct Answer is ["1.6"]
Step 1: Determine the total dose of ceftriaxone to administer.
The total dose prescribed is 400 mg. This dose will be divided into two equal doses for the infant.
Step 2: Calculate the volume for each dose.
The available ceftriaxone solution has a concentration of 500 mg in 2 mL. This means that 500 mg is present in 2 mL, so each mL contains 250 mg of ceftriaxone.
To calculate how many mL are needed for the total dose of 400 mg, we use the following formula:
Volume (mL)=Dose in mg/Concentration in mg/mL=400 mg/250 mg/mL=1.6 mL
Step 3: Round the answer.
1.6 mL
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["0.042"]
Explanation
Step-by-step calculation:
The desired dose of fluconazole is 42 mg.
We need to convert milligrams to grams.
Converting milligrams to grams:
1 g = 1000 mg
42 mg ÷ 1000 mg/g = 0.042 g
Correct Answer is ["2.1"]
Explanation
Step-by-step calculation:
The child's weight is 55 lb.
The medication dosage is 50,000 units/kg.
The available medication concentration is 600,000 units/mL.
Calculating the total dose in units:
Convert the child's weight to kg: 55 lb ÷ 2.2 lb/kg = 25 kg
Calculate the total dose: 25 kg × 50,000 units/kg = 1,250,000 units
Calculating the volume to administer:
Use the concentration of the medication: 1,250,000 units ÷ 600,000 units/mL = 2.0833 mL
Rounding the answer:2.0833 rounds to 2.1 mL
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