A medical certificate affirming the ability to work in the occupied position is a mandatory component of employee documentation. Employers should ensure that employees' medical certificates remain up-to-date, covering both working conditions and any changes in employees' health status. The issues of appealing against so-called conditional medical certificates, directing employees for preventive examinations, and the consequences of refusing to undergo such examinations are discussed by Trainee attorney-at-law (PL) Maria Aleksiejak in her latest article.