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🧮PTCE 2026 STUDY GUIDE
PTCB Order Entry and Pharmacy Calculations
Practice days supply, quantities, ratios, proportions, conversions, concentrations, package identifiers, and Sig translation.
8 key ideas8 flashcards5 practice questions
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For exam preparation only. Follow current law, employer procedure, and pharmacist direction in pharmacy practice.
Write the unit beside every number.
dose times frequency
round only as the task permits
Key ideas to know
Start with the relationships between ideas. Then close the notes and explain each one from memory.
- 01
Days supply equals total quantity divided by the amount used per day when use is regular.
- 02
Dimensional analysis carries units through a conversion until unwanted units cancel.
- 03
A proportion can solve dose, concentration, and package-size relationships when paired quantities are aligned.
- 04
Percent strength states an amount per 100 parts under the stated convention.
- 05
Ratio strength compares one part of drug with a stated number of total parts.
- 06
Sig codes must be translated into clear directions using approved terminology.
- 07
An NDC identifies the labeler, product, and package presentation.
- 08
Lot numbers trace a production batch, while expiration dates limit the labeled use period.
PART OF THE PTCE 2026 GUIDE
See every set in this course and follow a focused review order.
Open the full PTCE 2026 guide →Two ideas worth correcting now
NOT QUITE
→Days supply equals the quantity dispensed
USE THIS INSTEAD
Quantity must be divided by daily use.
NOT QUITE
→A calculator removes the need for unit setup
USE THIS INSTEAD
The calculator performs arithmetic but cannot choose the correct conversion.
Flashcards
Answer before opening each card. The effort to retrieve is part of the learning.
1How is days supply calculated for regular use?Show answer ＋
Total quantity divided by quantity used each day.
2What is 1 gram in milligrams?Show answer ＋
1,000 mg.
3What is 1 liter in milliliters?Show answer ＋
1,000 mL.
4What does bid mean?Show answer ＋
Twice daily.
5What does po mean?Show answer ＋
By mouth.
6What does an NDC identify?Show answer ＋
Labeler, product, and package presentation.
7What does a lot number trace?Show answer ＋
A production batch.
8Why retain units in a calculation?Show answer ＋
They show whether the conversion is set up correctly.
Explain it in your own words
Use the answer as a check after you have written or spoken your response.
01A prescription dispenses 60 tablets with directions to take one tablet twice daily. What is the days supply?
Two tablets are used daily. 60 divided by 2 equals 30 days.
02Convert 0.75 g to milligrams.
Multiply by 1,000 mg per gram to get 750 mg.
03A liquid contains 250 mg per 5 mL. What volume provides 500 mg?
500 mg is twice 250 mg, so the volume is 10 mL.
04Why are lot number and expiration date not interchangeable?
The lot traces a batch, while the expiration date marks the labeled use limit.
05A label says “5 mL po tid.” Translate it.
Take 5 mL by mouth three times daily. Final patient wording is subject to the pharmacy's approved process.
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