Hesi rn dosage calculations proctored exam
Calculation
The nurse is preparing to administer a prescription for cefazolin 600 mg IM every six hours. The available vial is labeled, *Cefazolin 1 gram," and the instructions for reconstitution state, "For IM use add 2 mL sterile water for injection. Total volume reconstitution equals 2.5 mL." When reconstituted, how many milligrams are in each mL of solution? (Enter numeric value only)
mg/mL
Explanation & Rationale
Given: Vial strength: Cefazolin 1 gram (1000 mg) Volume of diluent: 2 mL sterile water Total volume after reconstitution: 2.5 mL Step 1: Calculate the concentration of Cefazolin in the reconstituted solution: Concentration (mg/mL) = Total amount of Cefazolin (mg) / Total volume of solution (mL) Concentration (mg/mL) = 1000 mg / 2.5 mL Concentration (mg/mL) = 400 mg/mL
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