A physician prescribes 400 mg of an oral solution that is available as 100 mg per 10 mL. How many mL does the nurse need to administer using the ratio and proportion method?
40 mL
20 mL
80 mL
60 mL
The Correct Answer is A
Calculation:
- Set up the ratio and proportion
Available dose to volume = Desired dose to unknown volume
100 mg is to 10 mL as 400 mg is to X mL
- Cross multiply to solve for X
100 × X = 400 × 10
100X = 4000
X = 40 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
- Convert the prescribed dose to mg
0.75 g = 750 mg
- Identify the available tablet strength
Available Tablet Strength: 250 mg/tablet
- Calculate the number of tablets
Number of Tablets = Prescribed Dose ÷ Tablet Strength
Number of Tablets = 750 ÷ 250
Number of Tablets = 3 tablets
Correct Answer is C
Explanation
A. 1 mg = 100 mcg: One milligram equals 1,000 micrograms, not 100. Using 100 would underestimate the dose by tenfold, potentially leading to medication errors.
B. 1 mcg = 1,000 mg: One microgram is much smaller than a milligram; 1 mcg equals 0.001 mg. This option greatly overstates the amount, which could result in dangerous dosing errors.
C. 1 mg = 1,000 mcg: One milligram is equal to 1,000 micrograms. This is the correct conversion and is essential for accurate medication calculations, particularly for drugs that require very small doses.
D. 1 mcg = 100 mg: One microgram is far smaller than a milligram; this option reverses the relationship and exaggerates the amount, which is unsafe for clinical dosing.
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