HESI PN EXIT Proctored Exam 2
Calculation
The healthcare provider prescribes cefazolin 500 mg IM every 6 hours. The available vial is labeled, "Cefazolin 1 gram,”. and the instructions for reconstitution state, "For IM use, add 2.5 mL sterile water for injection to provide a total volume of 3.0 mL.”. After reconstitution, how many mL should be administered to the client? (Enter numeric value only. If rounding is required, round to the nearest tenth.). [No changes needed].
mL
Explanation & Rationale
To determine the correct volume of cefazolin to administer, you would use the concentration of the reconstituted solution. If 1 gram of cefazolin is reconstituted to a total volume of 3.0 mL, this means the concentration is 1 gram per 3.0 mL. Since the dose required is 500 mg, which is half of 1 gram, you would administer half of the total volume. Therefore, you would give 1.5 mL to deliver a dose of 500 mg.
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