Laboratory safety procedure for chemical, biological and equipment hazards
What a laboratory safety procedure must do
A laboratory safety procedure is a written, task-based system for identifying hazards, selecting controls, training workers and responding to incidents before work begins. It should not be a generic rule sheet kept in a folder. In laboratories that handle hazardous chemicals, biological materials, heat sources, pressure systems, sharps or analytical instruments, the procedure needs to connect daily work with risk assessment, standard operating procedures, emergency response and periodic review. In U.S.-focused references, OSHA’s Laboratory Standard, OSHA’s Hazard Communication Standard, CDC and NIH biosafety guidance, NIOSH’s hierarchy of controls and NFPA 45 are commonly used to shape these decisions.
This article focuses on how to build a procedure that a laboratory manager, safety officer, principal investigator or technical supervisor can adapt to real tasks. For more workplace safety topics, see our laboratory safety section.
Start with hazards, people and tasks
The strongest procedure starts with the work being performed. A laboratory that tests water samples, prepares cell cultures, operates high-temperature furnaces or performs solvent extraction will not need the same controls. The procedure should define its scope before it lists rules. Scope statements should identify the laboratory area, activities covered, materials handled, equipment used and people who may enter or perform the work.
A practical hazard review should cover at least six categories: chemical exposure, biological exposure, fire and explosion, mechanical or electrical energy, physical hazards such as heat or pressure, and human factors such as lone work, fatigue or unfamiliar tasks. This review should be completed before a new experiment, method transfer, instrument installation or material substitution. The output should be a short, usable risk summary rather than a long document that workers are unlikely to use at the bench.
Identify the work before selecting controls
For each task, the procedure should ask: What can go wrong, who could be harmed, how severe could the harm be, and what controls are already in place? This is especially important when work changes. A reagent used at milliliter scale may present a different risk at liter scale. A biological sample may require different containment when its source, concentration or manipulation method changes. A centrifuge, autoclave or compressed gas cylinder may also require equipment-specific checks that are not obvious from a general laboratory rule.
Use the hierarchy of controls
NIOSH describes the hierarchy of controls as a preferred order for reducing workplace exposure: elimination, substitution, engineering controls, administrative controls and personal protective equipment. A laboratory safety procedure should follow that logic. If a hazardous solvent can be replaced with a less hazardous one without compromising the method, substitution is stronger than relying only on gloves. If aerosols can be controlled inside a biosafety cabinet or vapors inside a certified fume hood, engineering controls are stronger than a warning sign. PPE remains important, but it should be the final layer, not the entire safety system.
Build the core procedure
A good procedure is specific enough to guide behavior and flexible enough to update when work changes. It should define responsibilities, required approvals, pre-work checks, safe operating steps, stop-work conditions, emergency response and review intervals. The table below shows a practical structure for many research, teaching, quality control and industrial laboratories.
| Procedure element | What to include | Why it matters |
|---|---|---|
| Scope and applicability | Laboratory rooms, tasks, materials, equipment and personnel covered | Prevents a general policy from being mistaken for a task-specific procedure |
| Roles and authority | Supervisor, safety officer, chemical hygiene officer, trained users and visitors | Clarifies who approves work, trains workers and can stop unsafe activity |
| Hazard assessment | Chemical, biological, physical, equipment and waste hazards | Connects controls to real risks instead of tradition or guesswork |
| Controls | Engineering controls, administrative controls, PPE and work restrictions | Shows how risk is reduced before work begins |
| Step-by-step work practice | Preparation, operation, shutdown, cleaning and waste handling | Makes safe behavior repeatable during routine and non-routine tasks |
| Emergency response | Spill, exposure, fire, injury, equipment failure and evacuation steps | Reduces confusion when time and judgment are limited |
| Records and review | Training records, inspections, incident reports and revision history | Supports accountability and continuous improvement |
The procedure should also state when work must stop. Examples include missing labels, unavailable safety data sheets, damaged electrical cords, malfunctioning ventilation, unknown biological material, cracked pressure glassware, incompatible chemical storage or untrained personnel attempting restricted work. Stop-work language is useful because it gives workers authority to pause work before a condition becomes an incident.
Chemical hygiene and hazard communication
For laboratories using hazardous chemicals in the United States, OSHA’s Laboratory Standard at 29 CFR 1910.1450 is a central reference. It requires a written Chemical Hygiene Plan when hazardous chemicals are used in laboratory work. That plan must address protective procedures, equipment, personal protective equipment and work practices capable of protecting workers from chemical health hazards. It also addresses information and training, medical consultation when appropriate, exposure monitoring where required and responsibilities for implementation.
A laboratory safety procedure should not replace the Chemical Hygiene Plan, but it should make the plan usable at the bench. For example, the procedure should tell workers how to check a chemical label, review a safety data sheet, verify fume hood performance indicators, choose compatible gloves, segregate waste and respond to a splash or inhalation concern. Particularly hazardous substances, such as select carcinogens, reproductive toxins or substances with high acute toxicity, should require additional review, designated areas, containment and decontamination steps.
Hazard communication also needs active management. OSHA issued a final rule updating the Hazard Communication Standard on May 20, 2024, with an effective date of July 19, 2024. For laboratory procedures, the practical takeaway is that labels, safety data sheets and training materials should be kept current as suppliers update classifications and SDS content. A procedure should specify who receives SDS updates, how obsolete copies are removed from active use and how workers are briefed when a new chemical hazard is introduced.
Biological materials and containment
Laboratories that handle microorganisms, human or animal specimens, recombinant or synthetic nucleic acids, toxins or contaminated sharps need biosafety controls as well as chemical controls. CDC and NIH’s Biosafety in Microbiological and Biomedical Laboratories, 6th Edition, published in 2020, remains a major U.S. biosafety reference for safe handling and containment of infectious microorganisms and hazardous biological materials. A laboratory safety procedure should identify the biosafety level, containment equipment, access restrictions, decontamination method and waste route for each biological activity.
Biological safety steps should be written around how exposure could occur. Aerosol generation during vortexing, pipetting, centrifugation or blending may require containment and sealed rotors or safety cups. Sharps handling should be minimized. Where sharps are unavoidable, the procedure should define approved devices and disposal containers. Surface decontamination should include the disinfectant, contact time, concentration, compatibility and preparation frequency. Autoclave use should include loading limits, cycle selection, burn prevention and verification requirements.
The procedure should distinguish routine work from incident response. A small contained spill inside a biosafety cabinet may require one response, while a spill outside containment or an exposure to mucous membranes may require reporting, medical evaluation and restricted access. Clear escalation criteria help workers act quickly without improvising.
Equipment, ventilation and fire risk
Laboratory equipment can create risks that are easy to overlook because an instrument appears familiar. A procedure should cover installation, authorized users, pre-use inspection, operating limits, maintenance status and shutdown. Instruments with heat, pressure, vacuum, lasers, moving parts, high voltage or stored energy should have task-specific operating steps and lockout or isolation expectations where applicable. Damaged equipment should be tagged out and removed from service until evaluated. See also: analytical methods.
Ventilation deserves specific instructions. Chemical fume hoods are designed to help control airborne contaminants, but they are not general storage cabinets. The procedure should instruct users to keep the sash at the correct working height, avoid blocking airflow, minimize clutter and report alarms or abnormal readings. Biosafety cabinets require different practices because they protect personnel, product or the environment depending on the class and application. Confusing a fume hood with a biosafety cabinet can create serious exposure or contamination risks.
Fire safety should be integrated into the procedure rather than treated as a separate poster. NFPA 45, Standard on Fire Protection for Laboratories Using Chemicals, has a 2024 edition that addresses topics including fire-safe laboratory design and operation, chemical quantities, ventilation systems and chemical fume hoods. A facility procedure should therefore address flammable liquid storage, ignition source control, compatible storage, cylinder restraint, hot work, emergency power loss and evacuation routes. Workers should know which fires they are not expected to fight and when evacuation is the correct response.
Training, drills and review
A procedure only works if people are trained to use it. Training should occur before initial assignment, when new hazards are introduced, after relevant incidents and when the procedure is revised. Effective training includes more than signing a form. Workers should be able to demonstrate that they can locate safety data sheets, select required PPE, inspect equipment, segregate waste, use emergency eyewash or shower equipment, report incidents and identify stop-work conditions.
Drills are useful for tasks where hesitation can increase harm. Spill response, evacuation, exposure reporting, power failure and equipment malfunction scenarios can reveal gaps that are not visible during document review. After a drill or incident, the laboratory should ask whether the procedure was clear, whether supplies were available, whether responsibilities were understood and whether communication worked.
Reviews should be scheduled and event-driven. Annual review is common, but waiting a full year is too long after a new method, new instrument, new chemical class, facility change or near miss. Revision history should show what changed, when it changed and who approved the update. This creates traceability without turning the procedure into a paperwork exercise.
Common gaps that weaken laboratory procedures
Many laboratory safety procedures fail for predictable reasons. The first is overgeneralization. A rule such as “wear proper PPE” is not enough unless the procedure explains what PPE is required for the task and what limitations apply. The second is missing ownership. If no one is responsible for updating the procedure, it will fall behind actual practice. The third is poor connection between documents. Risk assessments, SOPs, Chemical Hygiene Plans, biosafety manuals, equipment manuals and emergency plans should not contradict one another.
Another common gap is treating near misses as minor events. A near miss involving a mislabeled bottle, blocked eyewash, centrifuge imbalance or incompatible waste container may reveal the same weakness that could later cause an injury. A useful procedure encourages reporting without blame and focuses on correcting the system.
The final gap is assuming that compliance equals safety. Regulations and consensus standards provide essential structure, but local conditions still matter. Room layout, ventilation performance, staffing, language comprehension, workload and maintenance resources all affect whether a procedure can be followed. Editing the document is not enough; the laboratory must verify that the controls are practical in the room where the work happens.
Frequently asked questions
What is the difference between a laboratory safety procedure and an SOP?
An SOP usually describes how to perform a specific task or method. A laboratory safety procedure explains how hazards are assessed, controlled, communicated and reviewed across tasks. In practice, strong SOPs should include safety steps, and the safety procedure should define the safety requirements that SOPs must follow.
Does every laboratory need a Chemical Hygiene Plan?
In the United States, OSHA’s Laboratory Standard requires a written Chemical Hygiene Plan when hazardous chemicals are used in laboratory work as defined by the standard. Laboratories outside the United States should check local requirements, but the same concept is useful: chemical hazards need a written system for controls, training, responsibilities and review.
How often should a laboratory safety procedure be reviewed?
Many organizations review procedures at least annually, but review should also occur when work changes. New chemicals, instruments, biological agents, room layouts, incidents, near misses or updated requirements can all justify immediate revision.
Is PPE enough to make laboratory work safe?
No. PPE is important, but it is only one layer of protection. The hierarchy of controls places elimination, substitution and engineering controls ahead of administrative controls and PPE. A strong procedure uses PPE together with safer materials, containment, ventilation, training and clear work practices.
