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 tablets
available are 325 mg/tablet. 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: Identify the ordered dose and available strength.
• Ordered = 650 mg
• Available = 325 mg/tablet
Step 2: Set up dimensional analysis.
[
650\ \text{mg} \times \frac{1\ \text{tablet}}{325\ \text{mg}} =
2\ \text{tablets}
]
Step 3: Administer 2 tablets.
Medication Safety Note: Always verify tablet strength before
administration because different strengths may be stocked.

,Question 2 (Easy)
A patient is prescribed amoxicillin 500 mg PO. The suspension
available contains 250 mg per 5 mL. How many milliliters 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:
Ordered = 500 mg
Available = 250 mg/5 mL
Step 2:
[
500\ \text{mg}\times\frac{5\ \text{mL}}{250\ \text{mg}}=10\
\text{mL}
]
Step 3:

, Administer 10 mL.
Medication Safety Note:
Shake oral suspensions thoroughly before measuring the dose.


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:
Use the conversion:
1 g = 1000 mg
Step 2:
[
2.5\ \text{g}\times\frac{1000\ \text{mg}}{1\ \text{g}}=2500\
\text{mg}
]