Workplace health surveillance

The concept is new to occupational health and is frequently confused with medical screening. Health screening refers to the early detection and treatment of diseases associated with particular occupations, while workplace health surveillance refers to the removal of the causative factors.

Aspects

Medical surveillance

The mission of a medical surveillance program is to keep workers healthy and ensure that employers are meeting OSHA standards in health and safety. Medical surveillance has an emphasis on prevention: it is designed to detect potential workplace hazards before irreversible health effects can occur. Clinicians with expertise in occupational health, industrial exposures, and respiratory protection screen workers with physical examinations, blood testing, spirometry (a measurement lung function), and audiometry. Screenings are performed at set intervals, often annually. The clinicians providing medical surveillance services include board-certified occupational and environmental medicine physicians, mid-level practitioners, nurses, and NIOSH-certified spirometry technicians.

Medical surveillance targets actual health events or a change in a biologic function of an exposed person or persons. Medical surveillance is a second line of defense behind the implementation of direct hazard controls such as engineering controls, administrative controls, and personal protective equipment. NIOSH recommends the medical surveillance of workers when they are exposed to hazardous materials. The elements of a medical surveillance program generally include the following:

1. An initial medical examination and collection of medical and occupational histories
2. Periodic medical examinations at regularly scheduled intervals, including specific medical screening tests when warranted
3. More frequent and detailed medical examinations as indicated on the basis of findings from these examinations
4. Post-incident examinations and medical screening following uncontrolled or non-routine increases in exposures such as spills
5. Worker training to recognize symptoms of exposure to a given hazard
6. A written report of medical findings
7. Employer actions in response to identification of potential hazards

When the purpose of a medical surveillance program is to detect early signs of work-related illness and disease, it is considered a type of medical screening, to detect preclinical changes in organ function or changes before a person would normally seek medical care and when intervention is beneficial The establishment of a medical screening program should follow established criteria, and specific disease endpoints must be able to be determined by the test selected.

Medical examinations and tests are used in many workplaces to determine whether an employee is able to perform the essential functions of the job. Medical surveillance of workers is also required by law in the United States when there is exposure to a specific workplace hazard, and OSHA has a number of standards that require medical surveillance of workers In addition to substance-specific standards, OSHA has standards with broader applicability. For example, employers must follow the medical evaluation requirements of OSHA's respiratory protection standard (29 CFR 1910.134) when respirators are necessary to protect worker health. Likewise, the OSHA standard for occupational exposure to hazardous chemicals in laboratories (29 CFR 1910.1450) requires medical consultation following the accidental release of hazardous chemicals. NIOSH also recommends medical surveillance, including screening, of workers when there is exposure to certain occupational hazards.

Hazard surveillance

Hazard surveillance involves identifying potentially hazardous practices or exposures in the workplace and assessing the extent to which they can be linked to workers, the effectiveness of controls, and the reliability of exposure measures. Workplace hazards can be chemical, biological, physical, ergonomic, psychosocial, or safety-related in nature. Hazard surveillance is an essential component of any occupational health surveillance effort and is used for defining the elements of the risk management program. Critical elements of a risk management program include recognizing potential exposures and taking appropriate actions to minimize them (for example, implementing engineering controls, employing good work practices, and using personal protective equipment). Hazard surveillance should include the identification of work tasks and processes that involve the production and use of hazardous materials, and should be viewed as one of the most critical components of any risk management program.

Hazard surveillance includes elements of hazard and exposure assessment. The hazard assessment involves reviewing the best available information concerning toxicity of materials. Such an assessment may come from databases, texts, and published literature or available regulations or guidelines. Human studies, such as epidemiologic investigations and case series or reports, and animal studies may also provide valuable information. The exposure assessment involves evaluating relevant exposure routes (inhalation, ingestion, dermal, and/or injection), amount, duration, and frequency (i.e., dose), as well as whether exposure controls are in place and how protective they are. When data are not available, this will be a qualitative process.