Abstract
More than half of the so called "laboratory errors" has already happened before the analysis starts in the laboratory and many mistakes are made after the analysis itself. Pre- and post-analytical errors cause 60 to 90 % of all unexpected or erroneous values; only 10 to 15 % are caused by analytical problems. Internal quality control and external quality assessments are a matter of course today while standardisation still could be improved. The pre- and post-analytical processes however are only scarcely supervised. Good patient preparation, reliable patient identification and correct blood draws still cannot be taken for granted - improved training and education are necessary. There is also room for improvement in the communication of the results and the implementation of the consequences thereof. Errors in all phases of the analytical process contain valuable clues for optimisations. An improved culture of failure management would allow tapping the full potential of these clues.
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