DOSAGE CALCULATIONS MADE
EASY
SOLVING PROBLEMS USING
DIMENSIONAL ANALYSIS
8TH EDITION
• AUTHOR(S)GLORIA PEARL
CRAIG
TEST BANK
,NCLEX-RN Dosage Calculation Practice Examination
Question 1
Topic: Dimensional Analysis Fundamentals
The healthcare provider orders amoxicillin 500 mg PO twice
daily. The medication available is amoxicillin 250 mg per 5 mL.
How many mL will the nurse administer per dose?
A. 5 mL
B. 7.5 mL
C. 10 mL
D. 12.5 mL
Correct Answer: C. 10 mL
Rationale:
Step 1: Identify the desired dose and available concentration.
• Desired: 500 mg
• Available: 250 mg/5 mL
Step 2: Set up dimensional analysis to find mL per dose.
5 mL250 mg×500 mg1=5×500250 mL250 mg5 mL×1500 mg
=2505×500 mL
Step 3: Solve.
2500250=10 mL2502500=10 mL
,Medication Safety Note: Always verify that the prescribed dose
matches the available concentration. Double-check calculations
with a second nurse when administering high-alert medications.
Question 2
Topic: Unit Conversions
The provider orders furosemide 80 mg IV push. The available
vial contains furosemide 10 mg/mL. How many mL will the
nurse administer?
A. 2 mL
B. 4 mL
C. 8 mL
D. 10 mL
Correct Answer: C. 8 mL
Rationale:
Step 1: Identify desired dose and concentration.
• Desired: 80 mg
• Available: 10 mg/mL
Step 2: Set up dimensional analysis.
1 mL10 mg×80 mg1=8010 mL10 mg1 mL×180 mg=1080 mL
Step 3: Solve.
, 8010=8 mL1080=8 mL
Medication Safety Note: IV push medications require slow
administration over the recommended time. Always check the
facility's policy for IV push administration rates and monitor the
patient for adverse reactions.
Question 3
Topic: Oral Dosage Calculations
The nurse is preparing to administer digoxin 0.125 mg PO. The
medication is available as digoxin 0.25 mg tablets. How many
tablets will the nurse administer?
A. 0.25 tablet
B. 0.5 tablet
C. 1 tablet
D. 2 tablets
Correct Answer: B. 0.5 tablet
Rationale:
Step 1: Identify desired dose and tablet strength.
• Desired: 0.125 mg
• Available: 0.25 mg/tablet
Step 2: Set up dimensional analysis.
EASY
SOLVING PROBLEMS USING
DIMENSIONAL ANALYSIS
8TH EDITION
• AUTHOR(S)GLORIA PEARL
CRAIG
TEST BANK
,NCLEX-RN Dosage Calculation Practice Examination
Question 1
Topic: Dimensional Analysis Fundamentals
The healthcare provider orders amoxicillin 500 mg PO twice
daily. The medication available is amoxicillin 250 mg per 5 mL.
How many mL will the nurse administer per dose?
A. 5 mL
B. 7.5 mL
C. 10 mL
D. 12.5 mL
Correct Answer: C. 10 mL
Rationale:
Step 1: Identify the desired dose and available concentration.
• Desired: 500 mg
• Available: 250 mg/5 mL
Step 2: Set up dimensional analysis to find mL per dose.
5 mL250 mg×500 mg1=5×500250 mL250 mg5 mL×1500 mg
=2505×500 mL
Step 3: Solve.
2500250=10 mL2502500=10 mL
,Medication Safety Note: Always verify that the prescribed dose
matches the available concentration. Double-check calculations
with a second nurse when administering high-alert medications.
Question 2
Topic: Unit Conversions
The provider orders furosemide 80 mg IV push. The available
vial contains furosemide 10 mg/mL. How many mL will the
nurse administer?
A. 2 mL
B. 4 mL
C. 8 mL
D. 10 mL
Correct Answer: C. 8 mL
Rationale:
Step 1: Identify desired dose and concentration.
• Desired: 80 mg
• Available: 10 mg/mL
Step 2: Set up dimensional analysis.
1 mL10 mg×80 mg1=8010 mL10 mg1 mL×180 mg=1080 mL
Step 3: Solve.
, 8010=8 mL1080=8 mL
Medication Safety Note: IV push medications require slow
administration over the recommended time. Always check the
facility's policy for IV push administration rates and monitor the
patient for adverse reactions.
Question 3
Topic: Oral Dosage Calculations
The nurse is preparing to administer digoxin 0.125 mg PO. The
medication is available as digoxin 0.25 mg tablets. How many
tablets will the nurse administer?
A. 0.25 tablet
B. 0.5 tablet
C. 1 tablet
D. 2 tablets
Correct Answer: B. 0.5 tablet
Rationale:
Step 1: Identify desired dose and tablet strength.
• Desired: 0.125 mg
• Available: 0.25 mg/tablet
Step 2: Set up dimensional analysis.
