QUESTION

Our employee needs evenings off once per week for medical appointments but was hired to work our p.m. shift. Do we have to accommodate?

SHORT ANSWER
For qualifying disabilities, an employer needs to consider what are the essential job functions, and whether accommodations can be made to allow the employee to meet those functions.
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This is a prime example of when an employer needs to consider what are the essential job functions, and whether accommodations can be made to allow the employee to meet those functions.  Perhaps some appointments do have to occur in the evening and those days the employee could switch shifts. Generally, employers are expected to make some flexible scheduling available to accommodate qualifying disabilities.