The Universal Protocol is a three-step safety process designed to prevent surgeons from operating on the wrong patient, the wrong body part, or performing the wrong procedure entirely. Developed through expert consensus and enacted by The Joint Commission in July 2004, its basis lies in human factors science: the study of how people interact with systems, tools, and each other, and how those interactions can be optimized to prevent errors. The protocol translates those principles into three concrete checkpoints that every surgical team must complete before making an incision.
Why the Protocol Was Created
Wrong-site surgery sounds like something that shouldn’t happen in modern medicine, yet it remained stubbornly persistent through the 1990s and early 2000s. Between 1995 and 2005, The Joint Commission ranked it as the second most frequently reported sentinel event (a term for the most serious category of medical error), accounting for 455 of 3,548 reported events, or about 12.8% of the total.
The American Academy of Orthopedic Surgeons tried to address this in 1998 with a “Sign Your Site” campaign that encouraged surgeons to write their initials on the correct body part before surgery. It was a start, but it was voluntary and limited to one specialty. The Joint Commission’s Universal Protocol built on that idea and expanded it into a mandatory, standardized system for all accredited healthcare facilities.
The Human Factors Principle Behind It
The protocol’s theoretical foundation comes from a field called human factors engineering. This discipline studies how people make errors, not because they’re careless, but because of predictable breakdowns in communication, cognition, and workload. Operating rooms are high-pressure environments where multiple professionals work under time constraints, often with incomplete or fragmented information. A surgeon may have discussed the plan with the patient hours earlier. A nurse may be reading from a chart prepared by someone else. An anesthesiologist joins the team at the last moment.
Safety checklists in surgery were developed directly from these human factors principles to address high rates of avoidable critical events. The Universal Protocol works by creating forced pauses in the workflow, moments where every team member must stop, communicate actively, and confirm the same information out loud. This redundancy is intentional. It catches errors that slip through when any single person is distracted, rushed, or working from faulty assumptions.
Step One: Pre-Procedure Verification
The first component happens in the preoperative holding area, before the patient is moved to the operating room. Its purpose is to confirm three things: who the patient is, what procedure is planned, and exactly where on the body it will happen.
The team uses a checklist to verify that all relevant documents are present, accurate, and complete. This includes a current history and physical exam, written informed consent, and any necessary imaging or lab results. Critically, the team also confirms that its understanding of the plan matches the patient’s expectations. This step catches discrepancies early, when they’re easiest to resolve, rather than after the patient is sedated and draped on the table.
Step Two: Surgical Site Marking
Site marking is performed during the pre-procedure verification, also in the holding area. A licensed practitioner who will be present during the procedure marks the body at or near the incision site. In limited circumstances, this task can be delegated to certain medical residents, physician assistants, or advanced practice registered nurses.
The rules around the mark itself are precise. It must be unambiguous, using initials, the word “YES,” or a line representing the proposed incision. The letter “X” is discouraged because it could be interpreted as “not here.” The mark must be made with a pen permanent enough to survive the antiseptic skin preparation and remain visible after surgical draping. Adhesive markers alone are not sufficient. At a minimum, site marking is required for any case involving laterality (left versus right), multiple structures like fingers or toes, or multiple spinal levels.
Non-operative sites should not be marked, to avoid creating confusion about where the procedure will actually take place.
Step Three: The Surgical Time-Out
The time-out is the final checkpoint and the most visible part of the protocol. It takes place in the operating room, immediately before the first incision, and it requires the entire operative team to pause and participate. This includes the surgeon, anesthesiologist, nurses, and any other team members present.
During the time-out, the team verbally reviews:
- Patient identity, including name and medical record number
- Surgical site and site marking, confirming the correct side and location
- The procedure to be performed
- Patient positioning, ensuring the patient is oriented correctly on the table
- Relevant imaging or diagnostic studies
- Availability of necessary equipment, implants, devices, or blood products
- Allergies
- Whether antibiotics have been started
- Any special considerations relevant to the case
The time-out must use active communication, meaning team members speak and respond rather than silently nodding along. It also serves as a designated moment for anyone on the team to voice concerns about patient safety or the procedure. This is significant because operating rooms have steep hierarchies, and a nurse or technician might otherwise hesitate to speak up. The time-out creates a structured opening for that input. The process is briefly documented, often with a checklist, though each organization determines the exact format.
Where the Protocol Applies
Although the Universal Protocol is most closely associated with operating rooms, it applies to any invasive procedure where there’s a risk of performing it on the wrong site, on the wrong patient, or performing the wrong procedure altogether. This includes bedside procedures and interventions done outside the OR. The guiding principle is straightforward: if there’s more than one possible location for a procedure and doing it in the wrong location could harm the patient, the protocol applies.
How Effective It Has Been
The Universal Protocol has significantly reduced wrong-site events, but it hasn’t eliminated them. A review by the Agency for Healthcare Research and Quality found that the protocol might have prevented only about 62% of the wrong-site cases studied. That number highlights both the protocol’s value and its limits. Some errors originate so far upstream, in scheduling systems, imaging labels, or handoff communication, that they can survive all three checkpoints.
The protocol works best when teams treat it as a genuine safety tool rather than a bureaucratic formality. Studies of time-out compliance have found that the process sometimes becomes perfunctory, with team members going through the motions without truly engaging. When every person in the room actively listens, speaks up, and treats the pause as a real opportunity to catch mistakes, the protocol does what it was designed to do: create a final, reliable barrier between a preventable error and a patient on the table.