What Is a Lab Coat? A Plain-Language Guide

Last verified: October 6, 2026. A lab coat (or laboratory coat) is a long-sleeved, usually knee-length coat worn over everyday clothing in a laboratory. Its primary job is to act as a removable barrier: if a liquid is spilled or splashed, or if powder, dust, or biological material lands on the wearer, it lands on the coat and not on street clothes or skin. A lab coat can be taken off quickly, left at the laboratory, and laundered or discarded, which keeps whatever was on it from traveling to an office, a kitchen, or a home. It also helps protect the work from the wearer, reducing the shedding of fibers and skin particles in settings where cleanliness matters.

A lab coat is a basic item of personal protective equipment, usually abbreviated PPE, but it is only one layer. It does not protect every part of the body and does not provide the same protection against every hazard. Understanding what a coat is made of, how it is cut, and what it was designed to resist is the difference between a coat that actually helps and one that gives a false sense of security. For the wider picture of laboratory protective gear, see what laboratory PPE is.

Who Wears Lab Coats, and Why

• Research scientists and technicians in chemistry, biology, physics, and engineering laboratories wear them as routine protection and as a visible marker of the work area.
• Clinical laboratory staff wear coats designed to resist blood and body fluids and to be laundered or disposed of under infection-control rules.
• Students in teaching laboratories wear them as part of standard laboratory practice, which also builds habits for later work.
• Animal facility and agricultural staff wear coats or similar garments to protect clothing and to limit the transfer of material between areas.
• Visitors and service personnel may be asked to wear one when entering certain areas, along with whatever else the area requires.

Common Types of Lab Coat

Cotton and cotton-blend coats

The traditional coat is made from cotton or a cotton-polyester blend. It is comfortable, breathable, and washable, and it suits many general tasks involving low-level hazards. It is not especially resistant to liquids, which can soak through, and a coat that is not rated as flame resistant can burn.

Flame-resistant coats

Laboratories working with open flames, flammable liquids, or certain reactive materials often require coats made from fabric designed to resist ignition and self-extinguish. The label or manufacturer’s documentation, not appearance, says whether a coat is designed for that purpose.

Fluid-resistant and chemical-resistant coats

Coats made from or coated with materials that resist liquid penetration are used where splashes are likely. They typically trade some breathability for protection. No coat resists every chemical, so resistance has to be matched to what is actually used.

Disposable coats

Single-use coats made from lightweight nonwoven materials are common in clinical, cleanroom, and visitor settings and where cross-contamination is a concern. They are convenient and avoid laundering, but they are generally less durable and may not be fire-resistant.

Cleanroom and special-purpose garments

Settings such as semiconductor or sterile-manufacturing cleanrooms use garments designed to shed minimal fibers and particles, often as part of a full coverall system. These are about protecting the product from people as much as the reverse.

Closure and fit

Coats close with buttons, snaps, or zippers. Snaps allow fast removal in an emergency. Cuffs may be plain or elasticized, and sleeve length and body length both affect how much is covered. A coat that is too large can catch on equipment; one that is too small leaves gaps.

How a Lab Coat Differs From Adjacent Equipment

• Lab coat vs. apron. An apron covers the front of the torso and is often worn over a coat for added liquid resistance, for example when handling larger quantities of liquid. It leaves the arms and back uncovered.
• Lab coat vs. scrubs. Scrubs are work clothing used in healthcare, not a protective outer layer. For how reusable and disposable garments compare, see reusable vs. disposable scrubs and coveralls.
• Lab coat vs. gown. Gowns are designed for clinical and sterile settings, often with a fluid-resistant front, closed back, and tight cuffs. Lab coats are the general laboratory standard.
• Lab coat vs. goggles and gloves. The coat protects the torso and arms. Eyes and hands need their own protection; see what safety goggles are for eyes.

Wearing and Care in General Terms

Several habits are common across institutions. Coats are generally worn closed, with sleeves down, and kept for laboratory use only rather than worn in break rooms, offices, or public areas. Closed-toe shoes and long pants are normally required alongside them. Contaminated coats are removed promptly, and the institution’s procedure governs whether they are laundered by a service, laundered in-house, or discarded; taking a contaminated coat home to wash is typically prohibited because it moves the hazard out of the lab. Coats are inspected for damage, and a torn, stained, or heavily contaminated coat is replaced. These are general patterns and the controlling rules are local.

What a Lab Coat Does Not Do

Understanding the limits of a lab coat is part of using one well. A lab coat does not make a person safe from a hazard; it reduces certain exposures. It does not protect the face, eyes, hands, or legs. It does not stop a determined splash of corrosive liquid from soaking through ordinary fabric, which is why an apron or a more resistant garment is used for larger volumes. It does not guard against fire unless it is made from flame-resistant material, and synthetic fabrics can melt onto the skin near heat. It is not intended to protect against radiation or to serve as a barrier in every biosafety setting, where specialized gowns may be required. And it protects only when worn properly: a coat left open, with sleeves rolled up or the pockets full of items that can transfer contamination, offers much less than a coat fastened and used as intended. The practical lesson is that the coat is a layer in a system of controls that also includes careful technique, proper equipment, good ventilation, and training. When a task changes, the question to ask is whether the coat the lab already has is still the right one, not whether any coat is better than none.

Practical Notes for Research-Administration and Lab-Management Readers

• Match the coat to the hazard assessment. A single coat type will not suit every laboratory. A hazard assessment, normally led by the institution’s safety office, identifies whether flame resistance, fluid resistance, or disposable use is needed.
• Sizing and supply. Providing a range of sizes and replacing coats on a schedule makes compliance realistic. A coat that does not fit is a coat people avoid wearing properly.
• Laundering is a real cost and a real control. Contracted laundering, in-house machines, or disposables each carry different costs, logistics, and risks, and the choice should follow the hazards present.
• Visitors and short-term staff. Having spare coats available at entrances avoids both noncompliance and awkward exceptions.
• Training and documentation. Policies should state when coats are required, where they may be worn, and how to dispose of or launder them.

This page is general information, not clinical or safety training. Follow your institution’s procedures and the manufacturer’s instructions for any specific coat or hazard.

The Short Version

A lab coat is a removable protective layer worn over clothing to guard against spills, splashes, and contamination and to keep hazards from leaving the lab. Cotton coats suit general work, flame-resistant and fluid-resistant coats suit specific hazards, and disposable coats suit clinical or cleanroom settings. A coat is one part of a protective system and is only as good as its fit, condition, and match to the hazard. For managers, the practical takeaway is to base the choice on a written hazard assessment, provide sizes that fit, and make the laundering or disposal route clear, so that wearing the right coat is the easy thing to do.

Frequently Asked Questions

What is a lab coat used for?

Protecting skin and clothing from spills, splashes, and contamination, and preventing hazardous material from being carried out of the laboratory on everyday clothes.

Why are lab coats usually white?

White makes spills and stains easy to see and signals a clean laboratory environment. Colored coats are also used to distinguish roles, areas, or purposes.

Is a lab coat the same as a gown?

Not exactly. A gown is generally a clinical garment with a fluid-resistant front and closed back, while a lab coat is the general laboratory garment.

Are lab coats fireproof?

Standard cotton coats are not. Flame-resistant coats are made from special fabric and labeled accordingly. Always check what a coat was designed for.

Can I wear a lab coat outside the laboratory?

Generally no. Wearing it in offices, break rooms, or public areas can spread contamination. Local rules apply.

Can I wash a lab coat at home?

Many institutions prohibit it because laundering at home can carry hazards outside the lab. Follow your institution’s laundering or disposal procedure.