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)
The Correct Answer is ["400"]
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
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["40"]
Explanation
Given:
Vial strength: Cefotaxime 2 grams (2000 mg)
Volume of diluent: 50 mL of normal saline
Step 1: Calculate the concentration of Cefotaxime in the reconstituted solution:
Concentration (mg/mL) = Total amount of Cefotaxime (mg) / Total volume of solution (mL)
Concentration (mg/mL) = 2000 mg / 50 mL
Concentration (mg/mL) = 40 mg/mL
Correct Answer is ["6.25"]
Explanation
Given:
Ordered dose of erythromycin: 250 mg
Concentration of erythromycin suspension: 200 mg/5 mL
Step 1: Set up the proportion:
Desired dose (mg) / Volume to administer (mL) = Concentration (mg/mL)
Step 2: Substitute the values:
250 mg / Volume = 200 mg/5 mL
Step 3: Solve for the unknown volume:
Volume = 250 mg / (200 mg/5 mL)
Volume = 250 mg x (5 mL / 200 mg)
Volume = 6.25 mL
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