According to the 2002 data there are in Poland 14.3% of people with disabilities. On the other hand, an employment level of people with disabilities in Poland is one of the lowest in Europe with its percentage rate of 13% in the year 2004. Therefore, the improvement in certification system and its efficacy is needed. Occupational health service (OHS) plays an important role in the process of occupational elicitation of this group of people. Barriers at the level of OHS mainly result from the lack of guidelines in this field, so now it is essential to implement those that have been proposed. The improvement in occupational medicine physicians training is also essential. Difficulties in certification of ability to work is also the result of unavailable data on patient's health. Psychiatric problems, epilepsy and diabetes cause the major problems in the certification of capacity to work.