The nurse prepares to give 5 mg of a medication, but the vial label reads "10 mg/mL." How many mL should the nurse administer?
0.25 mL
1 mL
0.5 mL
5 mL
The Correct Answer is C
Calculation:
Prescribed dose = 5 mg
Available concentration = 10 mg per 1 mL
- Calculate the volume in milliliters (mL) to administer.
Volume (mL) = (Prescribed dose (mg) / Available concentration (mg/mL))
= (5 mg / 10 mg/mL)
= 0.5 mL.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. x mg: 0.5 tablet: This setup reverses the relationship and would not allow the nurse to calculate the correct number of tablets for the ordered dose.
B. 7.5 mg: x tablet: This correctly sets up a proportion with the desired dose (7.5 mg) on the left and the unknown number of tablets (x) on the right. Using the known tablet strength (15 mg per tablet) allows accurate calculation of the fraction of a tablet to administer.
C. x mg: 1 tablet: This setup incorrectly places the unknown dose as the numerator. It does not align with standard proportion calculations for determining the number of tablets needed.
D. 15 mg: x tablet: This setup represents the known tablet strength but does not pair it with the prescribed dose, so it is incomplete for solving the calculation safely.
Correct Answer is B
Explanation
Calculation:
Given dose = 325 mg
Conversion factor: 1 gram (g) = 1,000 milligrams (mg)
- Calculate the dose in grams (g).
Dose (g) = (Dose in mg / Conversion factor)
= (325 mg / 1,000 mg/g)
= 0.325 g.
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