Formaldehyde exposure in a gross anatomy laboratory

Area of Science:

• Occupational Health
• Environmental Science
• Medical Education

Background:

• Formaldehyde is a common fixative used in gross anatomy laboratories.
• Concerns exist regarding potential health risks associated with formaldehyde exposure, including its classification as an animal carcinogen.
• Occupational Safety and Health Administration (OSHA) has established permissible exposure limits for formaldehyde.

Purpose of the Study:

• To evaluate formaldehyde exposure levels for medical students and instructors during an eight-week gross anatomy laboratory course.
• To compare exposure levels between students and instructors.
• To identify factors influencing formaldehyde exposure, such as dissection stage and duration.

Main Methods:

• Air sampling was conducted throughout the eight-week laboratory term.
• Formaldehyde levels were measured for students and instructors.
• Exposure durations, including daily and time-weighted averages, were calculated based on laboratory activities.

Main Results:

• Formaldehyde exposure levels for students and instructors remained below the 3-ppm permissible exposure limit (PEL) under a 5-hour daily exposure assumption.
• Approximately one third of the eight-hour time-weighted-average (TWA) exposures exceeded 1 ppm.
• Exposure levels did not significantly differ between students and instructors and tended to decrease over the term, except during internal cadaver dissections.

Conclusions:

• While formaldehyde exposures in this gross anatomy lab were below the current 3-ppm OSHA PEL, a significant portion of TWA exposures exceeded 1 ppm.
• The findings highlight potential risks given formaldehyde's carcinogen classification and the trend toward lower exposure limits.
• Further monitoring and potential mitigation strategies may be warranted to minimize student and instructor exposure.