The nurse is to administer cefadroxil oral suspension 0.75 g PO every 12 hr. The pharmacy sends a cefadroxil oral suspension with a dosage strength of 250 mg/5 mL. The nurse sets up the following proportion:
250 mg: 5 mL :: 0.75 g: x mL
The nurse converts 0.75 g to mg, then solves the proportion. How much medication will the nurse give the patient?
15 mL
1.5 mL
2 mL
20 mL
The Correct Answer is A
Calculation:
- Convert the Ordered Dose from grams (g) to milligrams (mg).
Ordered Dose = 0.75 g
Conversion factor = 1 g = 1,000 mg
Ordered Dose (mg) = 0.75 g x 1,000 mg/g
= 750 mg
Dose Ordered (D) = 750 mg (the converted dose)
Dose Available (H) = 250 mg
Quantity (Q) = 5 mL
Volume (mL) = (Dose Ordered (D) / Dose Available (H)) x Quantity (Q)
= (750 mg / 250 mg) x 5 mL
= 3 x 5 mL
= 15 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Calculation:
- Identify the given volume in milliliters and the conversion factor.
Given volume = 2,000 milliliters (mL)
Conversion factor: 1 Liter (L) = 1,000 milliliters (mL)
- Calculate the volume in liters (L).
Volume (L) = (Volume in mL / Conversion factor)
= (2,000 mL / 1,000 mL/L)
= 2 L
Correct Answer is C
Explanation
A. 750 x 1,500 = 1 x X: This incorrectly multiplies the known dose by the desired dose without following the proper proportion rule of means and extremes.
B. 1 x 1,500 = 750 × X: This setup places the number of tablets on the wrong side of the equation, making the calculation incorrect.
C. 1 x x = 750 × 1,500: This correctly applies the rule of means and extremes, multiplying the means (1 and 1,500) and extremes (750 and x) to solve for the unknown number of tablets.
D. 750 x 1 = 1,500 x x: This reverses the proportion setup and does not accurately solve for x, leading to an incorrect calculation
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