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)
A provider orders acetaminophen 650 mg PO. The medication
available is acetaminophen 325 mg tablets. How many tablets
should the nurse administer?
A. 1 tablet
B. 1.5 tablets
C. 2 tablets
D. 3 tablets
Correct Answer: C. 2 tablets
Rationale:
Step 1: Set up dimensional analysis.
[
650 \text{ mg} \times \frac{1 \text{ tablet}}{325 \text{ mg}}
]
Step 2: Cancel mg units.
[
\frac{650}{325} = 2
]
Step 3: Determine the dose.
= 2 tablets
Medication Safety Note: Always verify tablet strength before
administration to avoid underdosing or overdosing.

,Question 2 (Easy)
A child is prescribed amoxicillin 500 mg PO. The suspension
available contains 250 mg per 5 mL. How many mL should the
nurse administer?
A. 5 mL
B. 7.5 mL
C. 10 mL
D. 15 mL
Correct Answer: C. 10 mL
Rationale:
Step 1: Set up dimensional analysis.
[
500 \text{ mg} \times \frac{5 \text{ mL}}{250 \text{ mg}}
]
Step 2: Cancel mg units.
[
\frac{500 \times 5}{250}=10
]
Step 3: Determine volume.
= 10 mL

, Medication Safety Note: Use an oral dosing syringe for accurate
liquid medication measurement.


Question 3 (Easy)
Convert 1.5 g to mg.
A. 150 mg
B. 1,500 mg
C. 15,000 mg
D. 150,000 mg
Correct Answer: B. 1,500 mg
Rationale:
Step 1: Use the conversion factor.
[
1 \text{ g}=1000 \text{ mg}
]
Step 2: Set up dimensional analysis.
[
1.5 \text{ g}\times\frac{1000 \text{ mg}}{1 \text{ g}}
]
Step 3: Calculate.