Scrub caps are head coverings worn by medical staff to keep hair, skin cells, and bacteria from falling into surgical sites or sterile areas. They’re a basic but important part of infection control in hospitals, and they serve several additional purposes that go beyond hygiene.
How Scrub Caps Prevent Infections
The average person sheds about 100 scalp hairs per day, and that rate can change during the physical activity and stress of a long surgical procedure. Each of those hairs can carry bacteria with it. Human hair is a known vehicle for Staphylococcus aureus, one of the most common causes of surgical site infections. When a surgeon or nurse leans over an open wound, any loose hair or skin flake that drops in can introduce bacteria directly into the body.
Scrub caps act as a physical barrier, trapping shed hair and the microorganisms attached to it. The Association of periOperative Registered Nurses (AORN) requires that all personnel cover their scalp and hair when entering semi-restricted and restricted areas of the operating room. Beards also need coverage in restricted areas, since facial hair of all lengths can harbor drug-resistant bacteria that shed into the surrounding environment at high rates.
Common Styles of Scrub Caps
Three main designs dominate hospital settings. Skull caps fit snugly against the head and are popular with surgeons who want a low-profile fit, especially when wearing magnifying loupes or headlights. Bouffant caps are the puffy, elasticized disposable caps that gather all hair inside a loose pouch, making them a practical choice for people with longer or thicker hair. Pixie caps are a smaller, fitted style that ties at the back.
A large study of over 1,500 patients compared surgical site infection rates between bouffant caps and skull caps and found no significant difference. Based on this evidence, AORN’s current guidance says the scalp and hair should be covered but does not recommend one style over another. Hospitals can allow either type based on surgical team preference. The key factor is proper fit: a correctly sized cap does a better job containing hair and preventing shedding regardless of style.
Disposable vs. Reusable Caps
Disposable scrub caps are typically made from non-woven polypropylene, a lightweight synthetic fabric. Reusable caps are usually cotton or a cotton blend and can be washed and worn repeatedly. There’s been ongoing debate about which type is cleaner, but the data suggests it doesn’t matter much.
A study comparing bacterial contamination on 21 disposable caps and 10 cloth caps, sampled at the end of surgical lists, found virtually identical results. The average bacterial count was 34.4 colony-forming units per plate for disposable caps and 35.2 for cloth caps, a difference that was not statistically significant. Interestingly, the two caps that grew Staphylococcus aureus (including one MRSA strain) were both disposable. Both cap types also picked up other environmental organisms like Bacillus species, which is expected in any clinical setting.
For reusable caps, proper laundering matters. The CDC recommends washing healthcare textiles at a minimum of 160°F (71°C) for at least 25 minutes for hot-water cycles. Lower-temperature washes (around 71°F to 77°F) can also reduce microbial contamination effectively, but only when combined with chlorine or oxygen-activated bleach and carefully controlled wash cycles.
Identification and Communication
In a busy operating room, everyone is masked and gowned in near-identical clothing. This makes it surprisingly hard to tell people apart, and that creates real problems. Staff may not know who’s a surgeon, who’s an anesthesiologist, and who’s a trainee. Patients can’t tell their care team members from one another.
Personalized scrub caps, embroidered with the wearer’s name and role, have become a practical solution. A study published in JAMA Network Open tracked surgical trainees who wore personalized caps for six months. About 66% reported fewer instances of being called the wrong name, and 67% reported fewer cases of their role being misidentified. Roughly two-thirds of participants also said the caps improved critical communication during trauma codes in the emergency department, reducing delays in patient care. And 66% felt the caps created a more professional perception among patients.
The study also found that personalized caps were associated with a decrease in microaggressions, reported by about 36% of participants. The researchers attributed this to fewer interpersonal conflicts arising from poor communication, particularly around mistaken identity.
Protection for the Wearer
Scrub caps don’t just protect patients. They also shield healthcare workers from splashes of blood, bodily fluids, and other contaminants that can land on exposed skin during surgery. Hair is difficult to decontaminate quickly, so keeping it covered prevents it from becoming a route of exposure. This is especially relevant during procedures that generate aerosols or involve high volumes of fluid, where droplets can travel further than expected.
Who Wears Scrub Caps Outside the OR
While scrub caps originated in operating rooms, they’ve spread to other clinical settings. Dental offices, veterinary surgical suites, and labor and delivery units all use them for the same basic reasons: infection control and fluid protection. During the COVID-19 pandemic, many healthcare workers in emergency departments and intensive care units adopted scrub caps as part of expanded personal protective equipment protocols, even in settings where they hadn’t been standard before.
Outside of healthcare, scrub caps have found a niche among professional chefs and food service workers who want a more comfortable, better-fitting alternative to traditional hair nets. The function is the same: keeping hair and its associated bacteria out of places it doesn’t belong.