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 patient is prescribed amoxicillin 750 mg PO. Tablets available
are 250 mg/tablet. How many tablets should the nurse
administer?
A. 2 tablets
B. 2.5 tablets
C. 3 tablets
D. 4 tablets
Correct Answer: C. 3 tablets
Rationale:
Step 1: Set up dimensional analysis.
[
750\ \text{mg} \times \frac{1\ \text{tablet}}{250\ \text{mg}}
]
Step 2: Cancel mg.
[
=3\ \text{tablets}
]
Step 3: Administer 3 tablets.
Medication Safety Note: Always verify tablet strength before
calculating the number of tablets.

,Question 2 (Easy)
A provider orders acetaminophen 650 mg PO. The liquid
available contains 160 mg per 5 mL. How many milliliters should
the nurse administer?
A. 15.3 mL
B. 18.5 mL
C. 20.3 mL
D. 25 mL
Correct Answer: C. 20.3 mL
Rationale:
Step 1:
[
650\ \text{mg}\times\frac{5\ \text{mL}}{160\ \text{mg}}
]
Step 2:
[
=\frac{3250}{160}=20.31\ \text{mL}
]
Step 3: Round to the nearest tenth.
20.3 mL

, Medication Safety Note: Use an oral syringe for accurate
measurement of liquid medications.


Question 3 (Easy)
Convert 2.5 grams to milligrams.
A. 25 mg
B. 250 mg
C. 2,500 mg
D. 25,000 mg
Correct Answer: C. 2,500 mg
Rationale:
Step 1:
[
2.5\ \text{g}\times\frac{1000\ \text{mg}}{1\ \text{g}}
]
Step 2:
[
=2500\ \text{mg}
]
Medication Safety Note: Confusing grams and milligrams can
result in 1,000-fold dosing errors.