Abstract
In each laboratory, a quality assurance program should be developed in order to obtain reliable results and to fulfil the requirements of quality standards in the field of microbiological laboratory tests. Microbiological diagnostics makes it possible to determine the etiological agent of infection and allow the selection of an appropriate therapy. The quality of test results are affected by pre-laboratory, laboratory and post-laboratory steps, which should be checked regularly. Constant internal quality control of performance in the laboratory and participation in external quality control programmes may ensure the quality of results. Internal quality control of the tests at all stages of routine microbiological diagnostics in the laboratory facilitates constant monitoring of the quality of results. Participation in interlaboratory external quality control programmes permits the quality of performance of tests routinely used in a laboratory to be assessed.
1. Introduction. 2. Quality assurance programme. 2.1. Factors affecting quality. 3. Internal quality control. 3.1. Quality control of identification tests. 3.2. Internal quality control of antimicrobial susceptibility testing and detecting resistance mechanisms. 3.3. Internal quality control of automated systems for identification and susceptibility testing. 4. External quality control. 4.1. External quality assurance programme participation rules. 5. Summary