Occupational health assessment in case of change in an employee’s state of health In case of reasonable doubts regarding the validity of employee’s medical certificate, it is appropriate, in order to ensure safe and healthy working conditions, that the employee be referred to an earlier periodic examination. This is justified by, inter alia, the judgment of the Supreme Court of 18 December 2002, ref. no. I PK 44/02 “A valid medical certificate within the meaning of Article 229 (4) Labour Code is a certificate determining the employee’s state of health, on the date the employee is allowed to work. It remains valid over the period mentioned, albeit it becomes obsolete if events occur during that period which may indicate a change in the employee’s state of health.” This means that an employer who receives information from employees about a significant deterioration in the health condition of a particular employee, or in the case of recurrent health problems or syncope during work, which may justify questioning the validity of the latest examination, should verify its validity. Referral to periodic examination, despite the validity of preventive examinations (considered only in terms of the date indicated on the certificate of the previous examination), are considered both admissible and necessary in order to ensure safe working conditions for individual employees - both for the person referred to the examination and their colleagues.