A patient is prescribed 500 mg of a medication. The available concentration is 250 mg/5 mL. How many milliliters should be administered?
10 ml
20 ml
15 mL
5 mL
The Correct Answer is A
Calculation:
Ordered Dose = 500 mg
Available Dose = 250 mg
Available Volume = 5 mL
Volume to administer = (Ordered Dose / Available Dose) × Available Volume
= (500 / 250) × 5
= 2 × 5
= 10 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Rationale:
A. Decreases the value by a factor of 1000: Moving the decimal point three places to the left in the metric system reduces the number’s value by 1/1000 of its original amount. For example, 1000 mL becomes 1 L, reflecting a thousandfold decrease in magnitude.
B. Decreases the value by a factor of 100: Moving the decimal two places left, not three, would decrease the value by a factor of 100. Three places are required for a factor of 1000.
C. Increases the value by a factor of 1000: Moving the decimal to the left decreases the number, not increases it. Increasing the value by a factor of 1000 would require moving the decimal three places to the right.
D. No change in value: Shifting the decimal alters the numerical value according to the number of places moved. Moving it three places to the left significantly decreases the value, so there is indeed a change.
Correct Answer is A
Explanation
Calculation using Ratio and Proportion
• Set up the Ratio and Proportion
Have (mg) / Quantity (mL) = Order mg / X (mL)
100 mg / 1 mL = 250 mg / X mL
• Solve for X (mL)
Cross-multiply and solve for X:
100 x X = 250 x 1
100X = 250
X = 250 / 100
X = 2.5
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