Healthcare workers wear scrubs primarily to reduce the spread of infection, both to patients and to themselves. Scrubs are designed to be laundered at high temperatures that kill dangerous bacteria, changed quickly when contaminated, and worn as a clear boundary between the clinical environment and the outside world. But infection control is only part of the story. Scrubs also serve as a visual identification system, offer practical features for physically demanding work, and solve problems that go back over a century.
The Infection Control Problem Scrubs Solve
The core reason scrubs exist is that clothing picks up bacteria and can carry it from one place to another. Common hospital pathogens survive on fabric far longer than most people realize. On cotton, Enterococcus species can live up to 90 days at room temperature. Staph bacteria and E. coli survive up to eight weeks. On polyester, some bacteria persist even longer: E. coli and Staph aureus can remain viable on polyester for up to 206 days.
That means a healthcare worker’s clothing can become a vehicle for moving dangerous organisms between patients, between hospital rooms, or between the hospital and the community. Scrubs address this by being easy to remove and replace during a shift if they become soiled, and by being laundered under conditions that street clothes typically aren’t subjected to.
Hospital and industrial laundry systems wash at a minimum of 160°F (71°C) for at least 25 minutes, a combination of heat, mechanical agitation, and chemical disinfection that renders fabrics “hygienically clean,” meaning free of disease-causing organisms even if not technically sterile. Home washing machines, by contrast, perform inconsistently. In one study, half of domestic machines running rapid cycles failed to reach even their stated temperature, topping out between 19°C and 44°C, and failed to adequately decontaminate a common hospital bacterium.
How Scrubs Replaced Street Clothes
For most of medical history, doctors simply wore their regular clothes to treat patients, including during surgery. Florence Nightingale introduced the first standardized nursing uniform during the Crimean War: a full-length dress and apron meant to protect nurses from illness. But physicians continued operating in street clothes well into the 20th century.
World War I and the 1918 flu pandemic, which killed between 20 and 40 million people, pushed doctors toward masks and basic protective measures. Still, it wasn’t until the 1940s that growing awareness of wound infection led to the first true surgical scrubs. Initially these were white gowns and drapes meant to symbolize cleanliness. White didn’t last long. It showed blood and stains too easily, and the glare of white uniforms under bright operating room lights contributed to eye strain.
By the 1960s and 1970s, operating room staff had shifted to green scrubs as a high-contrast alternative that was easier on the eyes. By the late 20th century, scrubs evolved into the familiar V-neck tops and drawstring pants worn across nearly every healthcare role today, largely because they were simpler to sterilize than traditional gowns.
Color Coding and Professional Identity
Walk into a hospital and you’ll notice different staff members wearing different colors. This isn’t random. Many hospitals assign specific scrub colors to specific roles so that patients, visitors, and other staff can quickly identify who does what. At OhioHealth, for example, registered nurses wear navy blue, surgical and labor-and-delivery teams wear light green, lab staff wear red, respiratory therapists wear dark green, and emergency medical technicians wear black. The exact color assignments vary between hospital systems, but the principle is consistent: scrub color acts as a uniform that communicates a person’s role without anyone needing to read a badge from across the room.
This matters in emergencies, when a team of people from different departments converges on a patient and needs to coordinate quickly. It also helps patients know who is caring for them and in what capacity.
Built for 12-Hour Shifts
Scrubs aren’t just about hygiene and identification. They’re workwear for people who spend long hours on their feet, frequently bending, lifting, and moving quickly. Modern scrubs are designed with specific ergonomic features that regular clothing doesn’t prioritize.
Most clinical scrubs now blend cotton or polyester with 2 to 5 percent spandex or elastane, allowing the fabric to stretch with the body rather than restrict movement. Pockets are placed on the chest and sides rather than the back, which distributes the weight of pens, scissors, phones, and other tools without throwing off posture during long shifts. Flat seams at high-friction points like the shoulders, sides, and inner thighs reduce chafing. Elastic or adjustable waistbands accommodate the body changes that happen over a 12-hour shift, such as bloating or water retention. Some designs include underarm gussets and vented hems to improve airflow and range of motion.
These details matter when your job involves repeatedly crouching beside a bed, reaching overhead, or sprinting down a hallway.
Keeping Contamination Out of the Community
One of the less obvious reasons for scrubs is containment. Healthcare workers travel to and from hospitals on public transit, stop at grocery stores, and go home to families. If they wore regular clothes in clinical settings, those same clothes would carry hospital bacteria into every environment they entered afterward.
This isn’t hypothetical. In one documented outbreak of sternal wound infections, investigators traced a cluster of cases to a nurse anesthetist whose home-laundered scrubs harbored the responsible organism. The same bacterium was found on her scrubs, hands, and even her roommate’s clothing and skin. The outbreak stopped only after she disposed of the washing machine she had been using to launder her work uniforms. Cases like this are why many hospitals now require staff to change into facility-provided scrubs on site and change out before leaving, rather than wearing scrubs to and from work.
That said, the CDC notes that reports of infections actually traced to contaminated healthcare clothing remain rare, and uniforms without visible blood or body fluid contamination don’t carry dramatically more bacteria than ordinary street clothes. The precautions around scrubs are largely about minimizing a real but low-probability risk across millions of healthcare encounters.
Antimicrobial Scrubs: Marketing vs. Reality
In recent years, several companies have marketed scrubs treated with antimicrobial coatings, including silver-ion treatments and other chemical agents. The clinical evidence for these products is not encouraging. In a blinded, randomized trial involving 720 scrub samples, 30% of treated scrubs and 30.3% of untreated scrubs were contaminated with pathogenic bacteria at the end of a typical shift. The difference was statistically meaningless. Average bacterial colony counts were virtually identical: 49 on treated scrubs versus 52 on standard ones.
Other trials using different antimicrobial products, including silver-based and organosilane-based treatments, have produced similarly disappointing results. The bottom line is that regular laundering at appropriate temperatures remains far more effective than any fabric coating currently available.
Environmental Tradeoffs
Hospitals use both reusable and disposable scrubs and gowns, and the environmental calculus between them is significant. Disposable scrubs are made from petroleum-based materials and generate large volumes of waste. When incinerated, they release air pollutants including dioxins and toxic metals like lead, cadmium, and mercury. U.S. medical waste incinerators are a major source of mercury and dioxin emissions nationally.
Reusable scrubs can withstand more than 50 industrial laundry cycles, which means their incineration emissions over a full lifecycle are roughly 2% of what disposable scrubs produce. The tradeoff is water and energy consumption: repeated industrial laundering uses substantial amounts of both and generates wastewater. Still, for most healthcare systems, the waste reduction from reusable scrubs makes them the more sustainable choice.