The Occupational Medical Forum presents questions of general interest received by the AOMA Committee on Occupational Medical Practice, Answers usually are prepared by the Committee, representing the composite best judgment of its members. Such replies do not necessarily represent an official position of the American Occupational Medical Association. In some cases, the responses will be prepared at the Committee's request by consultants with special qualifications in specific fields. Questioners are not named. Readers who wish to submit questions to the Committee should address inquiries to: Committee on Occupational Medical Practice, American Occupational Medical Association, 2340 S. Arlington Heights Rd., Arlington Heights, IL 60005.