Solving Problems Using Dimensional

DOSAGE CALCULATIONS MADE
EASY
SOLVING PROBLEMS USING
DIMENSIONAL ANALYSIS
8TH EDITION
• AUTHOR(S)GLORIA PEARL
CRAIG




TEST BANK

,Question 1 (Easy) — Dimensional Analysis Fundamentals
A patient is prescribed 750 mg of an antibiotic by mouth. The
tablets available contain 250 mg per tablet. How many tablets
should the nurse administer?
A. 2 tablets
B. 2.5 tablets
C. 3 tablets
D. 4 tablets
Correct Answer: C
Rationale:
Step 1: Set up dimensional analysis.
[
750\ \text{mg}\times\frac{1\ \text{tablet}}{250\ \text{mg}}
]
Step 2: Cancel mg.
[
=\frac{750}{250}=3\ \text{tablets}
]
Step 3: Administer 3 tablets.
Medication Safety Note: Always verify that the tablet strength
matches the prescribed dose before administration.

,Question 2 (Easy) — Oral Liquid Calculation
The provider orders 400 mg of ibuprofen suspension. The bottle
is labeled 100 mg per 5 mL. How many milliliters should the
nurse administer?
A. 10 mL
B. 15 mL
C. 20 mL
D. 25 mL
Correct Answer: C
Rationale:
Step 1:
[
400\ \text{mg}\times\frac{5\ \text{mL}}{100\ \text{mg}}
]
Step 2:
[
=\frac{400\times5}{100}=20\ \text{mL}
]
Step 3: Administer 20 mL.
Medication Safety Note: Use an oral syringe or medication cup
for accurate measurement.

, Question 3 (Easy) — Metric Conversion
Convert 2.5 g to milligrams.
A. 25 mg
B. 250 mg
C. 2,500 mg
D. 25,000 mg
Correct Answer: C
Rationale:
Step 1:
[
2.5\ \text{g}\times\frac{1000\ \text{mg}}{1\ \text{g}}
]
Step 2:
[
=2500\ \text{mg}
]
Medication Safety Note: Errors involving gram-to-milligram
conversions can result in tenfold dosing mistakes.