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Patient Safety Practice Test
25 PTCE-style questions, one at a time — just like exam day. Score and full explanations at the end. Free, no signup.
Patient Safety and Quality Assurance is the second-largest domain on the PTCE, and its questions are scenario-based: an error happens, or nearly happens, and you have to classify it and respond correctly. These 25 questions cover error types and prevention strategies, high-alert medications, look-alike/sound-alike drugs, and reporting systems — with explanations that teach the reasoning, not just the label.
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Question 1 of 25.A pharmacy technician pulls the wrong strength of a medication from the shelf, but the pharmacist catches the mistake during final verification before the prescription reaches the patient. How is this event best classified?
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A pharmacy technician pulls the wrong strength of a medication from the shelf, but the pharmacist catches the mistake during final verification before the prescription reaches the patient. How is this event best classified?
- An adverse drug event
- A sentinel event
- A near miss (correct answer)
- A prescribing error
A near miss (or close call) is an error that is caught and corrected before it ever reaches the patient, and it should still be documented so the pharmacy can fix the weakness that allowed it. An adverse drug event involves actual harm to a patient, which did not occur here because the pharmacist intercepted the mistake. A sentinel event is an unexpected occurrence involving death or serious injury, and a prescribing error originates with the prescriber's order, not with product selection during filling.
Which technology is most effective at catching a wrong-drug selection at the moment a technician pulls a stock bottle from the shelf to fill a prescription?
- Electronic prescribing
- Barcode (NDC) scanning during filling (correct answer)
- Automated refill reminder calls
- Child-resistant packaging
Barcode scanning verifies that the NDC on the stock bottle matches the drug entered on the prescription record, so a look-alike bottle pulled in error triggers an alert before the vial is filled. Electronic prescribing is a strong safeguard, but it prevents prescribing and transcription errors such as illegible handwriting; it cannot detect which physical bottle the technician picked up. Refill reminders address adherence, and child-resistant packaging addresses accidental ingestion, not product selection.
Which of the following medications is classified as a high-alert medication by the Institute for Safe Medication Practices (ISMP)?
- Insulin U-500 (correct answer)
- Amoxicillin oral suspension
- Loratadine tablets
- Docusate sodium capsules
High-alert medications are drugs that carry a heightened risk of causing significant patient harm when used in error; insulin, especially the concentrated U-500 product, is a classic example along with anticoagulants, opioids, concentrated electrolytes, and chemotherapy agents. Amoxicillin is dispensed very frequently and can cause allergic reactions, but a drug is designated high-alert based on the severity of harm an error would cause, not on how often it is used. Loratadine and docusate have wide safety margins.
Writing drug names with tall man lettering, such as hydrOXYzine and hydrALAZINE, is done primarily to:
- flag the drug as hazardous on the NIOSH list
- show that the drug requires refrigerated storage
- identify the drug's controlled substance schedule
- help staff distinguish look-alike/sound-alike drug names (correct answer)
Tall man (mixed-case) lettering capitalizes the portions of two similar drug names that differ, drawing the eye to the difference so hydrOXYzine (an antihistamine) is not confused with hydrALAZINE (an antihypertensive). It is a look-alike/sound-alike safeguard promoted by ISMP and FDA. It has no connection to hazardous drug status, storage requirements, or controlled substance scheduling, which are communicated through other labeling systems.
Which of the following drug pairs is a well-known look-alike/sound-alike (LASA) combination?
- lisinopril and atorvastatin
- clonidine and clonazepam (correct answer)
- metformin and insulin glargine
- amoxicillin and ibuprofen
Clonidine, an antihypertensive, and clonazepam, a benzodiazepine, have very similar spellings and both appear on lists of frequently confused drug names; a mix-up can cause serious harm because the drugs treat completely different conditions. The other pairs may be dispensed to the same patients, but their names do not look or sound alike, so they do not present the same selection risk.
Which storage practice best reduces the risk of selecting the wrong product when a pharmacy stocks two look-alike/sound-alike medications?
- Shelving the two products side by side so staff can compare them
- Keeping both products in the fast-mover section near the filling station
- Physically separating the products and adding shelf alert labels (correct answer)
- Repackaging both products into identical amber vials ahead of time
Separating LASA products on the shelf and marking their locations with warning stickers or tall man lettering forces a deliberate pause and makes an automatic wrong grab far less likely. Shelving the two products next to each other is the tempting answer because it sounds convenient, but strict alphabetical side-by-side placement is exactly how many LASA errors happen. Pre-repackaging into identical vials would remove the manufacturer labeling that helps staff verify the product.
The primary goal of a root-cause analysis (RCA) conducted after a serious medication error is to:
- identify the system failures that allowed the error to occur (correct answer)
- determine which employee should be disciplined for the mistake
- calculate the financial cost of the error to the pharmacy
- prepare a defense for a potential board of pharmacy inspection
An RCA is a retrospective, systems-focused review that repeatedly asks "why" until it uncovers the underlying process weaknesses, such as confusing storage, workload, or missing double checks, that made the error possible. Focusing on punishing an individual is the tempting distractor, but blame-centered responses discourage staff from reporting errors and leave the faulty system in place, so the same mistake can happen again with a different employee.
How does a failure mode and effects analysis (FMEA) differ from a root-cause analysis?
- FMEA reviews an error in depth after a patient has already been harmed
- FMEA ranks errors by their financial cost to the pharmacy
- FMEA assigns individual accountability for a completed error
- FMEA examines a process for possible failure points before an error occurs (correct answer)
FMEA is a prospective tool: the team maps out a process, such as launching a new compounding service, and asks where it could break down and how severe each failure would be, so safeguards are built in ahead of time. Root-cause analysis is the reactive counterpart, performed after an event to find out why it happened, so reviewing a completed error describes RCA rather than FMEA. Neither tool ranks events by financial cost, and both focus on fixing system weaknesses rather than assigning individual accountability.
A patient develops a serious, unexpected adverse reaction to a prescription medication. To which national program should this event be reported?
- The Joint Commission sentinel event database
- FDA MedWatch (correct answer)
- The Vaccine Adverse Event Reporting System (VAERS)
- The DEA diversion control program
MedWatch is the FDA's voluntary safety reporting program for serious adverse events, product quality problems, and medication errors involving drugs and medical devices. VAERS is the tempting distractor, but it is reserved specifically for adverse events following vaccines, not prescription drugs in general. The Joint Commission's sentinel event process applies to accredited facilities' internal events, and the DEA handles controlled substance diversion, not adverse reactions.
According to the ISMP list of error-prone abbreviations, why should the abbreviation "U" for units never be used on prescriptions or labels?
- It can be misread as a zero or a four, causing a tenfold or greater overdose (correct answer)
- Doses of biologic drugs must always be expressed in milligrams instead of units
- It can be confused with the abbreviation for microgram (mcg)
- It can be mistaken for the abbreviation for unit dose (UD), causing packaging errors
A handwritten "U" is easily mistaken for a "0" or a "4," so an order for "10U" of insulin can be read as 100 or 104 units, which is a potentially fatal overdose; the word "unit" should always be spelled out. Units remain the correct measure for drugs like insulin and heparin, so converting to milligrams is not the fix. The confusion documented on the ISMP list involves the numerals zero and four and the abbreviation "cc," not the microgram or unit-dose abbreviations.
Which of the following expresses a warfarin dose correctly according to safe medication practice guidelines?
- Warfarin 5.0 mg
- Warfarin .5 mg
- Warfarin 5 mg (correct answer)
- Warfarin 5.00 mg
Whole-number doses should be written without a trailing zero, so "5 mg" is correct. A trailing zero, as in "5.0 mg," is dangerous because a faint or missed decimal point turns the dose into 50 mg, a tenfold overdose of a high-alert anticoagulant. A naked decimal such as ".5 mg" is equally unsafe because it can be read as 5 mg; doses less than one should always carry a leading zero, written as "0.5 mg."
A prescriber's directions include the abbreviation "QOD." Based on the ISMP error-prone abbreviation list, what is the safest way to express this instruction on the label?
- Print it as Q.O.D. with periods for clarity
- Shorten it to OD to save label space
- Print it in lowercase as qod
- Write out the words "every other day" (correct answer)
QOD is on the ISMP do-not-use list because it is easily mistaken for QD (every day) or QID (four times daily), errors that would double or multiply the intended dosing frequency; the only safe practice is to spell out "every other day." Adding periods is the tempting fix, but the period after the Q can be misread as part of the letters, and it does not remove the underlying confusion. OD introduces a new error because it can mean "right eye."
A patient who was prescribed hydroxyzine is given a bottle of hydralazine by the pharmacy. Which type of medication error has occurred?
- Wrong dosage form error
- Wrong drug (dispensing) error (correct answer)
- Omission error
- Compliance error
The patient received a completely different medication than the one prescribed, which is a wrong drug error that occurred during the dispensing process; this LASA pair is a frequent cause of such mix-ups. An omission error means an ordered dose was never given at all, which is not the case here because the patient did receive a product. A compliance error refers to the patient failing to follow the prescribed regimen, and a wrong dosage form error would involve, for example, dispensing a capsule instead of an ordered liquid.
Which situation is an example of an omission error?
- A scheduled dose is skipped and never administered to the patient (correct answer)
- A medication ordered for intramuscular injection is given intravenously
- An extra dose that was never ordered is administered to the patient
- The pharmacy dispenses 20 mg tablets instead of the ordered 10 mg tablets
An omission error is the failure to administer an ordered dose before the next scheduled dose is due; the patient simply never receives the medication. Giving an unordered extra dose is the tempting opposite, but that is classified as an extra-dose or improper-dose error, not an omission. Administering by a different route than ordered is a wrong route error, and dispensing the wrong strength is a wrong dose or wrong strength dispensing error.
USP General Chapter <795> establishes standards for which pharmacy activity?
- Preparing sterile intravenous admixtures
- Handling and compounding hazardous drugs
- Nonsterile compounding, such as ointments and oral suspensions (correct answer)
- Wholesale distribution of manufactured drug products
USP <795> covers nonsterile compounding: preparations such as creams, ointments, capsules, and oral liquids made outside of a sterile environment, along with their beyond-use dating and documentation. USP <797> is the chapter that governs sterile preparations like IV admixtures, which makes it the natural distractor, and USP <800> adds requirements for hazardous drugs. Wholesale distribution is regulated separately and is not the subject of a compounding chapter.
Sterile compounding must be performed inside a primary engineering control, such as a laminar airflow workbench, that maintains which ISO air-quality classification?
- ISO Class 8
- ISO Class 7
- ISO Class 6
- ISO Class 5 (correct answer)
The direct compounding area inside the primary engineering control must meet ISO Class 5, the cleanest classification used in the compounding suite; remember that a lower ISO number means cleaner air with fewer particles. ISO Classes 6, 7, and 8 permit progressively higher particle counts, so none of them provides air clean enough for the space where sterile critical sites are directly exposed.
In a cleanroom suite, the buffer room that houses the laminar airflow workbench must meet at least which air-quality standard?
- ISO Class 5
- ISO Class 7 (correct answer)
- ISO Class 8
- ISO Class 9
Under USP <797>, the buffer room, the room where the primary engineering control is located, must be at least ISO Class 7. ISO Class 5 is a stricter classification than the room itself is required to maintain, and ISO Class 8 is not clean enough for the room in which compounding activities take place. ISO Class 9 approximates ordinary room air, which is never acceptable within a classified cleanroom suite.
When performing hand hygiene before sterile compounding, the technician should wash:
- the hands and forearms up to the elbows with soap and water for at least 30 seconds (correct answer)
- the hands and wrists only, for about 15 seconds
- up to the elbows, then apply hand lotion to prevent skin cracking
- with an alcohol-based rub alone, which replaces the soap-and-water wash
USP <797> requires washing the hands and the forearms all the way up to the elbows with soap and water for a minimum of 30 seconds to remove debris and reduce the microbial load before garbing. An alcohol-based hand rub is applied afterward, before donning sterile gloves, but it supplements rather than replaces the initial wash. Hand lotion is prohibited in the compounding area because it sheds particles and can contaminate gloves and preparations.
During garbing for sterile compounding, which item is donned last?
- Shoe covers
- Face mask
- Non-shedding gown
- Sterile gloves (correct answer)
Garbing proceeds from the items considered dirtiest to those that must stay cleanest, so sterile gloves go on last, after the gown is secured and an alcohol-based hand rub has been applied and allowed to dry. The gown is the tempting answer because it goes on late in the sequence, but it still precedes the gloves. Shoe covers, hair covers, and face masks are donned early because they cover the most contaminated areas of the body.
Which agent should be used to disinfect the interior surfaces of a laminar airflow workbench before compounding begins?
- Household bleach diluted with tap water
- Hydrogen peroxide 3% from the retail shelf
- Sterile 70% isopropyl alcohol (correct answer)
- Antibacterial hand soap and warm water
Sterile 70% isopropyl alcohol is the standard agent for disinfecting the hood, applied with low-lint wipes working from the cleanest area near the HEPA filter outward and allowed to air-dry so it has time to act. Diluted bleach is the tempting choice because it is a strong disinfectant, but tap water introduces microorganisms and residue, and non-sterile retail products are not acceptable inside an ISO Class 5 environment. Hand soap is for skin, not for engineering controls.
To preserve "first air" from the HEPA filter, all critical manipulations inside a horizontal laminar airflow workbench must be performed:
- at the front edge of the work surface for the best visibility
- at least 6 inches inside the front edge of the hood (correct answer)
- on a sanitized counter directly next to the hood
- with the vial septum turned away from the HEPA filter
The outer 6 inches of the work surface is a zone of turbulence where filtered air mixes with room air, so all critical work must occur at least 6 inches inside the hood, where uninterrupted first air from the HEPA filter bathes the critical sites. Working at the front edge is the tempting choice for visibility, but it exposes the preparation to unfiltered air. In a horizontal hood, critical sites such as vial septa should face the filter, not away from it, and nothing sterile may be handled outside the hood.
USP General Chapter <800> requires that hazardous drugs be compounded in an area that is:
- maintained under negative pressure and vented to the outside (correct answer)
- maintained under positive pressure, like a standard IV cleanroom
- open to the main dispensing area so the pharmacist can supervise
- used for hazardous work only during overnight shifts to limit exposure
Hazardous drug compounding must occur in a negative-pressure room with external ventilation so that any airborne drug residue is pulled into the containment area and exhausted outdoors instead of drifting toward staff. Positive pressure is the tempting answer because it is correct for non-hazardous sterile compounding, but positive pressure would push contaminated air out of the hazardous area into adjacent spaces. Open layouts and shift scheduling do nothing to contain airborne contamination.
When compounding a chemotherapy preparation, USP <800> standards direct the technician to wear:
- a single pair of chemotherapy-rated powdered latex gloves
- sterile gloves only if the pharmacist specifically requests them
- one pair of vinyl exam gloves, changed every two hours
- two pairs of powder-free gloves tested to the ASTM D6978 standard (correct answer)
USP <800> calls for double gloving with powder-free gloves that have been tested against the ASTM D6978 standard for resistance to permeation by hazardous drugs. A single pair is the tempting shortcut, but one glove layer can be permeated or punctured without the wearer noticing, and powdered gloves are prohibited even when the glove material is rated for hazardous drugs, because powder can carry drug residue. Standard vinyl exam gloves are not rated for hazardous drug exposure regardless of how often they are changed, and appropriate gloving is mandatory, not something a pharmacist must request.
A hazardous drug vial breaks on the pharmacy floor. What is the appropriate first response?
- Wipe up the liquid with paper towels and discard them in the regular trash
- Mop the area with warm water so no residue remains
- Restrict access to the area, alert staff, and use the hazardous drug spill kit (correct answer)
- Open the doors to the main pharmacy to ventilate the fumes
The trained responder should first secure and mark the spill area so no one walks through it, then don the PPE from the hazardous drug spill kit and clean up using its absorbent materials, disposing of all waste in hazardous waste containers. Wiping the spill up quickly with paper towels is the tempting reflex, but it exposes unprotected skin and places contaminated waste in the regular trash. Opening doors would spread airborne contamination into adjacent work areas rather than contain it.
Which safeguard is most appropriate before a high-alert medication such as warfarin is dispensed?
- Waiving patient counseling so the patient is not alarmed
- An independent double check by a second staff member (correct answer)
- Storing every strength of the drug in one shared bin for easy comparison
- Relying on the e-prescribing system to catch any dosing problems automatically
High-alert medications warrant redundant safeguards, and an independent double check, in which a second person verifies the drug, strength, dose, and directions without being told what to expect, is a core ISMP-recommended strategy for drugs such as the anticoagulant warfarin. Counseling should be increased for high-alert drugs, not waived, because the patient is the final check in the dispensing process. Mixing every strength of a drug in a single bin invites wrong-strength selection, and no automated system replaces human verification for the highest-risk medications.
FAQ: Patient Safety on the PTCE
What does the Patient Safety domain cover on the PTCE?
It is the second-largest domain at 26.25% of scored questions. Expect error types (prescribing, dispensing, administration), near misses versus adverse drug events, high-alert medications such as insulin, opioids, and anticoagulants, look-alike/sound-alike drug pairs and tall man lettering, plus error-reporting systems and hygiene standards.
What is the difference between a near miss and an adverse drug event?
A near miss is an error caught before it reaches the patient — the pharmacist spots the wrong strength at final verification, for instance — while an adverse drug event is harm that actually reaches the patient. Both should be documented: a near miss exposes the workflow gap before someone gets hurt.
How do I get better at scenario-style safety questions?
Classify what the scenario describes before you read the options: What type of error is it? Did it reach the patient? Who must be told? The explanations in this drill walk through that reasoning chain, and the same three questions unlock most Patient Safety items on the real exam.
Are these questions taken from the real PTCE?
No. Real PTCE items are confidential and belong to PTCB — be wary of any site claiming to have them. Our questions are original, written to mirror the style, difficulty, and published content outline of the exam. Scoring well here is strong evidence you are ready, not a preview of the exact questions you will see.
Is this practice test really free?
Yes. Every question, explanation, and score report on PharmacyTechTest is free, with no signup, no credit card, and no trial that expires. Retake any test as many times as you want.
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