A vial contains 1.5 g of ceftriaxone. The final concentration after adding diluent should be 600 mg/3 mL. How much diluent should a nurse add to achieve this concentration?
0.0075 mL
1.2 mL
7.5 mL
1800 mL
The Correct Answer is C
To calculate the amount of diluent that should be added, we need to first calculate the volume of the final solution. .
The final concentration of ceftriaxone should be 600 mg/3 mL, which is the same as 200 mg/mL. .
If we have 1.5 g (or 1500 mg) of ceftriaxone, we can divide this by the desired concentration to get the total volume of the final solution:.
1500 mg ÷ 200 mg/mL = 7.5 mL.
So, the total volume of the final solution should be 7.5 mL. .
To calculate the amount of diluent needed, we need to subtract the volume of the ceftriaxone from the total volume of the final solution:.
7.5 mL - 0.00 mL = 7.5 mL.
Therefore, a nurse should add 7.5 mL of diluent to the vial containing 1.5 g of ceftriaxone to achieve a final concentration of 600 mg/3 mL.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
The correct answer is choice B. 31. To find the number of bottles required, use the formula: (dose x frequency x duration) / (bottle size x bottle concentration). In this case, (4 mg/kg x 43 kg x 3 times/day x 6 days) / (100 mg/bottle) = 30.96 bottles. Round up to the nearest whole number to get 31 bottles.
Correct Answer is D
Explanation
A. 0.04 mg
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This is far too small.
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It might come from a miscalculation involving the concentration (1 mg/mL) and volume (5 mL), but incorrectly dividing again by 100.
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Not clinically reasonable because the patient would barely receive any drug.
B. 0.25 mg
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This is also incorrect.
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It could result from mistakenly dividing 5 mg by 20 minutes instead of 2 minutes.
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Again, far below the actual ordered rate.
C. 3.75 mg
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This is incorrect but closer.
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It might come from a misstep like subtracting 1.25 mg from the correct answer (2.5 mg) or misusing the concentration.
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Still not the right calculation.
D. 2.5 mg
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Correct answer.
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Direct calculation: 5 mg ÷ 2 minutes = 2.5 mg/min.
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Matches the ordered dose and administration time.
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