A full-time visit for several weeks of candidates of specialists of internal medicine in laboratories, in which competent specialists of clinical chemistry are working, contributes to the improvement of the interdisciplinary cooperation. By recognition of the pre- and post-analytic errors and by the scientifically proved indication on the basis of diagnostic strategies as well as an effective interpretation the effectiveness of the laboratory diagnostics in the process of medical care can be increased. Practical abilities ready for use are particularly demanded for bed-side methods and in the fields of haematology and haemostaseology.