Analysis system and computer implemented method for analyzing biological samples are disclosed. The system has at least one analyzer for performing an analysis and a decision unit being operable to determine in response to the receipt of the analysis request whether results obtained from performing the analysis on the sample indicated in the analysis request are valid. This determination is executed by retrieving the meta information assigned to the sample and by applying the at least one condition on the meta information and wherein the at least one applied condition has at least a condition on whether the sample allows a valid analysis on the sample, and wherein the decision unit returns the decision that the analysis exercised on the indicated sample will return a valid result in case the conditions of the condition set are met by the sample.