A nurse is preparing to administer cefazolin 500 mg IM to a client. Available is cefazolin powder 500 mg vial. After reconstitution, the concentration available is cefazolin 330 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["1.5"]
The nurse should administer 1.5 mL of cefazolin solution.
Here's the calculation:
Desired dose: 500 mg
Concentration after reconstitution: 330 mg/mL
We can find the volume to administer by dividing the desired dose by the concentration and rounding to the nearest tenth:
Volume to administer (rounded to nearest tenth) = Dose / Concentration
= 500 mg / 330 mg/mL
= 1.5 mL (rounded to nearest tenth)
Therefore, the nurse should administer 1.5 mL of the reconstituted cefazolin solution.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["10"]
Explanation
To administer 5mg of cetirizine with a concentration of 2.5mg/mL, the nurse should indeed administer 10 mL.
Here's the corrected calculation:
Desired dose: 5 mg
Concentration of available cetirizine: 2.5 mg/mL
We can find the volume to administer by dividing the desired dose by the concentration
Volume to administer = Dose / Concentration
= 5 mg / (2.5 mg/mL)
= 2 mL
However, since each milliliter only contains 2.5mg, we need to administer more than 2mL to reach the desired dose of 5mg.
To get to 5mg, we need to administer twice the amount (2 x 2.5mg = 5mg). This translates to:
Total volume to administer = 2 mL/dose x 2 doses
= 10 mL
Therefore, the nurse should administer 10 mL of the cetirizine solution.
Correct Answer is ["0.5"]
Explanation
Desired dose: 100 mg
Concentration of available amoxicillin suspension: 200 mg/5 mL
Steps to find the volume to administer (in teaspoons):
Calculate the volume in milliliters (mL):
Volume (mL) = Desired dose (mg) / Concentration (mg/mL)
Volume (mL) = 100 mg / 200 mg/5 mL
Convert milliliters (mL) to teaspoons (tsp) considering rounding:
Since 1 teaspoon (tsp) is approximately equal to 5 mL, we can directly convert while considering rounding to avoid unnecessary precision loss.
Since 5 mL is divisible by 200 mg (desired dose), rounding won't affect the final answer significantly.
Therefore,
Volume (tsp) = Volume (mL) / Conversion factor (mL/tsp) (rounded to nearest tenth)
Volume (tsp) = 100 mg / (200 mg/5 mL) ≈ 0.5 tsp (rounded to nearest tenth)
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