A do not disturb vest is a brightly colored garment worn by nurses during medication rounds to signal that they should not be interrupted. The idea is simple: distractions during medication preparation and delivery lead to errors, and a visible warning can keep those distractions at bay. Hospitals, clinics, and health systems around the world have adopted these vests as part of broader medication safety programs, though the evidence on their effectiveness is more nuanced than you might expect.
Why Interruptions During Medication Rounds Matter
Nurses preparing and administering medications are performing one of the most error-prone tasks in healthcare. Getting the right drug, in the right dose, to the right patient requires sustained concentration. When that focus is broken, whether by a colleague asking a question, a phone ringing, a patient in another room pressing a call bell, or a visitor stepping in, the chance of a mistake goes up. The factors that contribute to medication errors include high workloads, the number of patients a single nurse is responsible for, noisy environments, and frequent distractions.
The do not disturb vest exists to address one specific piece of that puzzle: the interruption itself. By making it visually obvious that a nurse is in the middle of a critical task, the vest is meant to encourage everyone else on the unit to hold their non-urgent requests until the round is finished.
What These Vests Look Like
Most do not disturb vests are high-visibility tabards or pullover-style garments in bold colors, commonly red, yellow, or bright orange. They typically feature printed text on the front and back with phrases like “Do not interrupt,” “Medication round in progress,” or “I am administering medication, please do not disturb.” The design borrows from high-visibility safety apparel used in construction and transportation, where bright colors and clear messaging are standard for signaling caution.
The vest is intentionally eye-catching. It needs to work at a glance for staff, patients, and visitors who may not be familiar with the protocol. Hospitals that implement the vest often pair it with posters at unit entrances explaining why nurses wear them and asking patients and families not to interrupt unless they have an urgent need.
How Hospitals Use Them
The protocol is straightforward. A nurse puts the vest on before starting the medication preparation and administration round and removes it once the round is complete. During that window, other staff members are expected to redirect non-urgent questions, handle phone calls themselves, and manage patient requests that can safely wait a few minutes.
The French Health Authority formally recommended the use of do not interrupt vests during medication rounds as early as 2011, and the practice has since spread across hospitals in Europe, Australia, North America, and elsewhere. Some facilities use the vest as a standalone intervention; others combine it with additional strategies like designated quiet zones for medication preparation, checklists nurses carry during the round, and diversion protocols where a second staff member fields interruptions on behalf of the nurse doing the round.
Do They Actually Reduce Errors?
This is where things get complicated. The vest has strong face validity, meaning it makes intuitive sense that it would help. But the controlled evidence is limited. A multicenter cluster randomized controlled trial published in BMC Nursing noted that despite widespread recommendations, no prior randomized studies had actually evaluated whether the vest reduces medication administration errors. The trial set out to measure the vest’s impact on error rates, error types, clinical severity of errors, and interruption frequency.
Broader evidence reviews from Australia’s Macquarie University found that the vest’s effectiveness depends heavily on what it’s paired with. One study found that combining vests with checklists and diversion strategies (having a designated person handle interruptions) reduced interruptions significantly more than using diversion strategies alone. Another study using vests alongside ward signs and checklists found that the average number of interruptions per medication round hour dropped for certain sources, specifically interruptions from fellow nurses, casual conversation, missing medications, and general noise. However, interruptions from patients, visitors, doctors, and telephone calls did not decrease.
A separate study that combined vests with a dedicated medication preparation room found significant decreases in interruptions from unavailable supplies, patient requests, other activities, and phone calls. But interruptions from needing to search for information, answering call bells, managing documentation, and miscellaneous other sources persisted. The pattern across studies is consistent: vests help with some types of interruptions but not others, and they work best as one component of a broader system rather than a standalone fix.
Limitations and Concerns
One concern raised by the Agency for Healthcare Research and Quality is that the vest may discourage patients from speaking up even when they have a legitimate, urgent need. If a patient is experiencing a new symptom, having an allergic reaction, or noticing something wrong with their IV, they need to feel comfortable interrupting the nurse regardless of what the nurse is wearing. Hospitals that use the vest well address this directly in patient education materials, making clear that the vest is meant to reduce unnecessary interruptions, not block communication about safety concerns.
There is also the issue of habituation. When staff see the same vest every day, multiple times per shift, its visual impact can fade. Colleagues who initially respected the signal may gradually return to old patterns, tapping the vested nurse on the shoulder for a quick question or routing a phone call their way out of habit. This is a well-documented challenge with any visual warning system, and it means that vest programs require ongoing reinforcement, not just a one-time rollout.
Some nurses find the vest uncomfortable, impractical to put on and take off repeatedly, or even stigmatizing, as though wearing it broadcasts that they cannot handle distractions. Buy-in from the nursing staff matters enormously. A vest protocol that feels imposed from administration without input from the people actually wearing it is less likely to be used consistently.
Making the Vest Work Better
The evidence consistently points toward bundled interventions outperforming any single strategy. If your unit or facility is considering a do not disturb vest program, the research suggests a few practical steps that improve outcomes:
- Combine the vest with a diversion plan. Assign a colleague to handle phone calls, patient requests, and staff questions during the medication round so the vested nurse truly can focus.
- Use signage at unit entrances. Posters explaining the vest to patients and visitors reduce confusion and set expectations before anyone enters the unit.
- Designate a quiet preparation area. A separate or marked space for drawing up medications reduces ambient noise and foot traffic during the most error-prone phase of the process.
- Add a checklist. A simple printed list of steps the nurse follows during the round serves as both a cognitive aid and a visual reinforcement that the process is structured and deliberate.
- Refresh the program regularly. Periodic reminders, updated training, and staff discussions about what is and isn’t working counteract the natural tendency for the vest to become invisible over time.
The do not disturb vest is not a silver bullet for medication safety. It is a low-cost, low-tech visual cue that works best when embedded in a system of complementary strategies. Used well, it gives nurses a concrete, visible boundary during one of the most cognitively demanding parts of their shift.