A nurse is preparing to administer nafcillin 500 mg IM to a client.
The amount available is nafcillin 1 g powder.
The package insert instructs reconstituting with 3.4 mL of sterile water to yield nafcillin 250 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.). mL.
The Correct Answer is ["2 mL"]
Step 1 is to find out how many mg are in 1 mL after reconstitution. This is done by dividing the total amount of mg available (1000 mg) by the total volume in mL after reconstitution (3.4 mL). So, 1000 mg ÷ 3.4 mL = 294.12 mg/mL. Step 2 is to find out how many mL are needed to get 500 mg. This is done by dividing the required amount in mg (500 mg) by the concentration in mg/mL (294.12 mg/mL). So, 500 mg ÷ 294.12 mg/mL = 1.7 mL. So the correct answer is 2 mL (rounded to the nearest whole number).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["56"]
Explanation
Step 1 is to calculate the total volume to be infused in minutes. This is done by multiplying the total volume (2000 mL) by the drop factor (20 gtt/mL), and then dividing by the total time (12 hr × 60 min/hr). So, (2000 mL × 20 gtt/mL) ÷ (12 hr × 60 min/hr) = 55.56 gtt/min, which rounds to 56 gtt/min.
Correct Answer is ["& mL"]
Explanation
Step 1 is to convert the client’s weight from pounds to kilograms since the dosage is ordered in units/kg. There are approximately 2.2 lb/kg, so 130 lb ÷ 2.2 lb/kg = 59.1 kg. The doctor ordered calcitonin at a dosage of & units/kg, so we multiply the client’s weight in kg by the dosage: 59.1 kg × & units/kg = & units. The medication is available at a concentration of 200 units/mL, so we divide the total units needed by the units per mL: & units ÷ 200 units/mL = & mL.
So, the correct answer is & mL.
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