Ati rn dosage calculation med surg Proctored exam
Calculation
A nurse is preparing to administer cefazolin 500 mg IM every 8 hr. Available is cefazolin 1 g vial. The package insert instructs adding sterile water 2.5 mL to yield cefazolin 330 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
mL
Explanation & Rationale
Calculation: Identify the ordered dose and reconstituted concentration Ordered Dose: 500 mg Reconstituted Concentration: 330 mg/mL Calculate the volume to administer Volume to administer = Ordered Dose ÷ Concentration Volume to administer = 500 ÷ 330 Volume to administer ≈ 1.515 mL Round to the nearest tenth = 1.5 mL
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