[Preanalytical step in bacteriology : a practical overview for family physicians].

Physicians play a key role in the accuracy of bacteriological results by appropriate prescription and the quality of sample collection, preservation and transport. Samples for diagnostic purposes are of use if analysis results have an impact on the therapeutic approach. They have minimal risk of contamination, are usually obtained invasively, and may be targeted to detection of specific bacteria. Physicians should refer to the laboratory technical manual to provide proper sample quality. Furthermore, they have to provide clinical and administrative information to the microbiologist, because the laboratory analytical process depends on these. Close collaboration between physicians and microbiologists is essential.