Biohazard bags are red or orange. These are the standard colors recognized across hospitals, laboratories, and clinics to signal that the contents are potentially infectious and require special handling. OSHA allows a red bag to serve as a standalone warning, meaning it can replace the biohazard symbol label entirely. Other bag colors, including yellow, black, and clear or white, are used in medical settings for different waste streams, each with its own disposal rules.
Why Red and Orange Are the Standard
OSHA’s bloodborne pathogens standard requires that containers holding regulated waste, blood, or other potentially infectious materials carry a biohazard label. That label must feature the biohazard symbol in a contrasting color against a fluorescent orange or orange-red background. A solid red container or bag can substitute for the label altogether, which is why red has become the default in most facilities.
In practice, you’ll see red bags far more often than orange ones, but both are compliant. Some facilities use orange bags for specific categories like pathological waste (human tissue, organs, body parts) while reserving red for general infectious waste like blood-soaked bandages, used sharps containers, and contaminated lab materials. The exact breakdown varies by institution, but the rule is consistent: if a bag is red or orange, treat the contents as biohazardous.
What Yellow Bags Are For
Yellow containers or bags are used for trace chemotherapy waste. This includes items like empty IV bags, gloves, and gowns that came into contact with chemotherapy drugs but contain only minimal residue, generally less than 3% of the original drug volume. These items can’t go into standard red biohazard bags because chemotherapy drugs are chemically hazardous, not just infectious, and require a separate disposal pathway.
Bulk chemotherapy waste, meaning items with more than trace amounts of the drug, goes into black containers labeled for hazardous pharmaceutical disposal. The yellow and black distinction matters because trace chemo waste and bulk chemo waste are handled and destroyed through entirely different processes.
Clear and White Bags Signal Routine Waste
Clear, white, or tan bags without a biohazard symbol are used for non-regulated biological waste. In a research lab, for example, autoclaved soil, plant material, or other biological waste that doesn’t meet the legal definition of medical waste can go into a plain, unlabeled bag. Once sterilized and cooled, these bags can be thrown into a standard dumpster like ordinary trash.
This distinction saves facilities significant money on disposal costs. But the boundary is strict: if a clear or white bag accidentally bears a biohazard symbol, or if someone uses a red bag for non-regulated waste, the entire bag must be processed through the more expensive medical waste stream. The color of the bag, not just what’s inside it, determines how waste handlers treat it.
How Bag Color Affects Disposal
Red and orange biohazard bags are typically autoclaved, a process that uses pressurized steam to sterilize the contents. After autoclaving, the bags are segregated into designated bins for treated medical waste. Even after sterilization, autoclaved red or orange bags cannot be mixed with routine trash or placed in building dumpsters. They follow a separate disposal chain from start to finish.
Some types of waste in red bags, particularly pathological waste, may go to incineration instead of autoclaving. The routing depends on the contents, but the color coding ensures that everyone handling the bag, from the lab technician who filled it to the waste hauler who picks it up, knows it requires special treatment.
Handling and Containment Rules
Red biohazard bags aren’t just tossed into a corner. Standard practice at most facilities requires double-bagging: two red bags nested inside a rigid, leakproof container with a tight-fitting lid. Bags should be tied in a single knot at the neck once full, or before seven days of accumulation, whichever comes first. During transport within a building, the bags must stay inside a secondary biohazard container.
The bags themselves are built to handle rough treatment. Federal transport regulations require biohazard bags to pass standardized tests for tear resistance and impact resistance. Specifically, the film must withstand an impact of 165 grams and a tearing force of 480 grams in both directions. These aren’t ordinary garbage bags; they’re engineered to avoid punctures and leaks from items like broken glass, used needles that escaped a sharps container, or sharp-edged lab equipment.
Quick Color Reference
- Red or orange: infectious and biohazardous waste, including blood-contaminated materials, used lab cultures, and pathological waste
- Yellow: trace chemotherapy waste with minimal drug residue
- Black: bulk chemotherapy and hazardous pharmaceutical waste
- Clear, white, or tan (no symbol): non-regulated biological waste that can enter the normal trash stream after sterilization
If you work in a setting that generates medical waste, the simplest rule is this: when in doubt, use a red bag. Placing non-hazardous waste in a biohazard bag costs extra but causes no safety problem. Placing biohazardous waste in a regular bag creates a genuine risk to anyone who handles it downstream.