A prescription reads for 1 g ceftriaxone IM daily. The available vial contains ceftriaxone 500 mg/2 mL. How many mL should the nurse administer per dose?
2 mL
4 mL
6 mL
8 mL
The Correct Answer is B
Identify the ordered dose and available concentration
Ordered Dose: 1 g (1000 mg)
Available Concentration: 500 mg/2 mL
Calculate the volume to administer
Volume to administer = (Ordered Dose ÷ Concentration) × Volume of Concentration
Volume to administer = (1000 ÷ 500) × 2
Volume to administer = 2 × 2
= 4 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Identify the ordered dose and vial concentration
Ordered Dose: 2,000 mcg (2 mg)
Available Concentration: 1 mg/mL
Calculate the volume to administer
Volume to administer = Ordered Dose ÷ Concentration
Volume to administer = 2 ÷ 1
= 2 mL
Correct Answer is C
Explanation
Identify the ordered dose and available concentration
Ordered Dose: 500 mg
Available Concentration: 250 mg/5 mL
Set up dimensional analysis
(500 mg) × (5 mL ÷ 250 mg) = mL
500 × (5 ÷ 250) = 500 × 0.02
= 10 mL
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