Patient Safety and Quality Assurance is 23.75% of the scored PTCE (the PTCB exam). Answer 10 exam style questions on high-alert medications and error-prone abbreviations and see exactly which concepts would cost you points on test day.
Start the 10 questions →What makes a medication "high-alert" according to ISMP?
These questions cover high-alert medications, error-prone abbreviations and error-prone dose expressions. Each one shows the correct answer and why every other option is wrong, so a miss tells you exactly what to review before the PTCE.
Prefer to read first? Every question from the practice set above, with the correct answer and why each wrong option is wrong.
Answer: C. ISMP defines high-alert medications as drugs that bear a heightened risk of causing significant patient harm when they are used in error. Errors with them are not necessarily more common, but the consequences are more serious.
Why not A: The definition is about severity of harm, not how often errors happen.
Why not B: Many high-alert drugs, such as insulin and warfarin, are not controlled substances.
Why not D: Cost plays no role in the high-alert definition.
Exam tactic: High-alert is about how BAD an error would be, not how often it happens.
Answer: D. "Q.D." is on the Joint Commission "Do Not Use" list. The period after the Q can look like an I, turning QD into QID (four times daily), a 4-fold overdose. The replacement is to write "daily."
Why not A: HS is a separate error-prone abbreviation. QD is not usually misread as HS.
Why not B: QH is not the classic misreading of QD. The concern is QID.
Why not C: BID looks very different from QD. The documented confusion is with QID.
Exam tactic: QD -> "daily". QOD -> "every other day". Spell them out.
Answer: D. Without a leading zero, the decimal point in ".125" is easy to miss, and the dose can be read as 125 mg, a 1,000-fold overdose of a narrow therapeutic index drug. It should be written 0.125 mg.
Why not A: The risk is losing the decimal point entirely, not moving it one place.
Why not B: The format of the number does not change the dosage form selected.
Why not C: Commas are not used in decimals. The documented risk is missing the decimal point.
Exam tactic: No leading zero: a missed decimal turns .125 into 125.
Answer: B. ISMP recommends added safeguards for high-alert medications, such as standardized processes, limited access, automated alerts, and independent double checks where they add the most value.
Why not A: Storing high-alert drugs beside look-alikes raises the risk of selection errors.
Why not C: Barcode scanning is a key safeguard. Skipping it removes protection.
Why not D: Refills of high-alert drugs can also carry errors and still need full verification.
Exam tactic: High-alert = extra layers: double checks, standardization, limited access, alerts.
Answer: B. "Every other day" spelled out is the required replacement for QOD. The other directions contain banned abbreviations: QOD, Q.D., and U.
Why not A: QOD is on the "Do Not Use" list. It can be mistaken for QD (daily) or QID.
Why not C: Q.D. is on the "Do Not Use" list. It can be mistaken for QID.
Why not D: "U" is on the "Do Not Use" list. It can be misread as 0 or 4.
Exam tactic: Scan each option for banned items: U, IU, QD, QOD, MS/MSO4/MgSO4, trailing zero, missing leading zero.
Answer: C. Doses below 1 need a leading zero (0.5 mg), and whole numbers must not have a trailing zero. "0.5 mg" follows both rules.
Why not A: A missing leading zero lets .5 mg be misread as 5 mg, a 10-fold overdose.
Why not B: A trailing zero lets 1.0 mg be misread as 10 mg if the decimal point is missed.
Why not D: This adds an unnecessary trailing zero after the 5. ISMP says not to use trailing zeros, because a missed decimal point or misread zero invites a dosing error.
Exam tactic: Always a leading zero (0.5), never a trailing zero (1, not 1.0).
Answer: C. Concentrated potassium chloride for injection is on the ISMP acute care high-alert list. Accidental undiluted injection can cause fatal cardiac arrest, so it is commonly removed from patient care units and supplied as premixed bags.
Why not A: Cefazolin is a cephalosporin antibiotic. It is not a high-alert medication.
Why not B: Ondansetron is an antiemetic and is not on the high-alert list.
Why not D: Famotidine is an H2 blocker and is not on the high-alert list.
Exam tactic: Concentrated electrolytes (especially potassium chloride) = high-alert in hospitals.
Answer: A. "cc" can be mistaken for "u" (units) when poorly written. ISMP recommends using "mL" for volume.
Why not B: Adding an "s" keeps the same error-prone abbreviation.
Why not C: Cubic centimeters is still not the recommended expression. ISMP recommends mL.
Why not D: "u" for units is itself on the "Do Not Use" list.
Exam tactic: Volume = mL. Never cc.
Answer: C. Pediatric liquid medications that require measurement are on the ISMP community high-alert list. Expressing doses in mL only and supplying a matching oral syringe prevents teaspoon/tablespoon and kitchen spoon errors.
Why not A: Teaspoon and tablespoon units cause confusion and 3-fold errors. Doses should be in mL.
Why not B: Kitchen spoons vary widely in volume and are a known source of dosing errors.
Why not D: Mixed or non-metric markings that do not match the mL dose lead to measuring errors.
Exam tactic: Pediatric liquids: mL only, with an oral syringe that matches the dose.
Answer: A. MS, MSO4, and MgSO4 are on the "Do Not Use" list because they can be confused for one another. The drug name must be written out: "morphine sulfate" or "magnesium sulfate."
Why not B: The issue is confusion between morphine sulfate and magnesium sulfate, not manganese.
Why not C: MgSO4 for magnesium sulfate is also on the list. Both must be written out.
Why not D: The order includes IV. The problem is the ambiguous drug name.
Exam tactic: MS, MSO4, MgSO4 -> write "morphine sulfate" or "magnesium sulfate".
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