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A 165 lb woman in active labor with chorioamnionitis is prescribed 20 mg of vancomycin per kg (20 mg/kg) every 8 hours. How many grams of vancomycin will be added to a 250 mL solution for administration?

Answer :

Final answer:

To prepare a vancomycin solution for a 165 lb woman prescribed 20 mg/kg every 8 hours for chorioamnionitis, 1.5 grams of vancomycin should be added to a 250 mL solution.

Explanation:

The question asks how many grams of vancomycin should be added to a 250 mL solution for a 165 lb woman prescribed 20 mg/kg every 8 hours, assuming she has chorioamnionitis. First, converting the woman's weight to kilograms (1 lb = 0.453592 kg), 165 lb is approximately 74.84 kg.

Multiplying the patient's weight in kg by the dosage per kg gives the total dosage required per administration. Specifically, 74.84 kg × 20 mg/kg = 1496.8 mg. Since the question asks for the answer in grams, dividing by 1000 converts mg to g, yielding 1.497 g, which can be rounded to 1.5 g due to standard practice in medication preparation.

Therefore, 1.5 grams of vancomycin will be added to the 250 mL solution for administration.

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