A patient is to receive cefazolin 500 mg IM. The powder must be reconstituted with 2 mL of sterile water to yield 225 mg/mL. How many mL will the nurse administer?

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Multiple choice — select the best answer

A2.2 mL
B2 mL
C2.5 mL
D1.8 mL

✓ Correct answer: A. 2.2 mL After reconstitution, the concentration is 225 mg/mL. Using the formula: Desired dose (500 mg) divided by Available concentration (225 mg/mL) = 500 / 225 = 2.22 mL, rounded to 2.2 mL.

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A patient is to receive cefazolin 500 mg IM. The powder must be reconstituted with 2 mL of sterile water to yield 225 mg/mL. How many mL will the nurse administer?

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