Practice Question
The healthcare provider prescribes cefazolin 800 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.. "How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
Answer Choices:
Correct Answer:
2.4
Rationale:
🧪Step 1: Convert the available dose to milligrams.
1 gram = 1,000 mg
🧪Step 2: Determine the concentration after reconstitution.
1,000 mg in 3.0 mL
1,000 mg ÷ 3.0 mL = 333.3 mg/mL
🧪 Step 3: Calculate the volume needed for 800 mg.
800 mg ÷ 333.3 mg/mL
2.4 mL
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This question is from Hesi-RN Dosage Calculation IV which contains 55 questions.
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Question Details
- Category: RN Nursing Exam(s)
- Subcategory: HESI Exam(s)
- Domain: Hesi Dosage Calculations
- Answer Choices: 1