The provider prescribes the following: Ceftriaxone 1.5g IVPB every 12 hours.
The pharmacy sends up a vial (4g) that needs to be reconstituted with 12mL of sterile water for a final concentration of 2g per 2.5mL.
How many milliliters will be drawn up to add to a 100mL bag of D5W to administer to the client? (Do not use a leading zero, Round to the nearest tenth, Do not use a trailing zero). mL
The Correct Answer is ["1.9"]
Step 1 is to determine the concentration of the reconstituted medication. The vial contains 4g and is reconstituted with 12mL for a final concentration of 2g per 2.5mL.
Step 2 is to calculate how many mL are needed for the 1.5g dose. The desired dose is 1.5g. The concentration is 2g in 2.5mL.
Step 3 is to set up a proportion: (2g ÷ 2.5mL) = (1.5g ÷ X mL).
Step 4 is to solve for X: X mL = (1.5g × 2.5mL) ÷ 2g.
Step 5 is to calculate the value: X = 3.75 ÷ 2.
Step 6 is to calculate the final answer: X = 1.875 mL.
Step 7 is to round to the nearest tenth: 1.9 mL. The final calculated answer is 1.9 mL.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
A normal serum sodium level ranges from 135 to 145 mEq/L. A value of 120 mEq/L is significantly below the normal range, indicating hyponatremia, not an elevated level. Therefore, reporting it as elevated would be incorrect.
Choice B rationale
While laboratory errors can occur, a serum sodium level of 120 mEq/L in a client with chronic renal failure is a plausible finding due to impaired fluid and electrolyte balance, making a repeat analysis not the immediate primary interpretation without further clinical context.
Choice C rationale
While electrolyte abnormalities are common in chronic renal failure, a serum sodium of 120 mEq/L is a low sodium level (hyponatremia), not necessarily an "expected" abnormality in the sense of being benign or typical without specific context. It reflects a significant imbalance.
Choice D rationale
Chronic renal failure often leads to fluid retention due to impaired kidney excretion. This excessive water retention dilutes the body's sodium concentration, leading to a condition known as dilutional hyponatremia, where the total body sodium may be normal or even elevated, but its concentration is lowered by the excess fluid.
Correct Answer is ["0.3"]
Explanation
Step 1 is: 25 mg ÷ (80 mg ÷ 1 mL) = 0.3125 mL.
Step 2 is: Round 0.3125 mL to the nearest tenth, which is 0.3 mL. Answer: 0.3 mL.
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