A method to provide control samples for validating a diagnostic test within a laboratory system, wherein the laboratory system comprises an aliquoting device configured to generate control sample aliquots from a total control sample volume, a storage configured to store control sample aliquots, a transport system configured to transport control sample aliquots, at least two analyzers (50, 52) configured to execute the diagnostic test and to validate the diagnostic test by measuring one control sample, and a control unit, wherein the aliquoting device, the storage, and the at least two analyzers (50, 52) are operatively connected to the transport system, wherein the aliquoting device, the storage, the transport system, and the at least two analyzers (50, 52) are communicatively connected to the control unit, wherein the method comprises the following steps (12, 14, 16, 18): a) determining, by the control unit, a total number of control sample aliquots and an aliquot volume for each control sample aliquot based on a validation time schedule, wherein each aliquot volume comprises a dead volume and a volume comprising a determined number of control samples each with a volume required for validating the diagnostic test once, wherein the validation time schedule comprises a defined time period and at least one time segment, wherein the validation time schedule defines for each of the at least two analyzers (50, 52) and for each of the at least one time segment a number of validation time points at which a control sample aliquot is scheduled to be transported to one or more of the at least two analyzers (50, 52) for validating the diagnostic test by measuring one control sample of the control sample aliquot b) providing one or more vessels containing the total control sample volume to the aliquoting device, wherein the total control sample volume is at least the sum of aliquot volumes of the total number of control sample aliquots c) generating, by the aliquoting device, the determined total number of control sample aliquots with the determined aliquot volumes d) controlling, by the control unit, the transport system to transport at least one control sample aliquot to the storage or to one of the at least two analyzers (50, 52) for validating the diagnostic test by measuring one control sample of the at least one control sample aliquot according to the validation time schedule. a) determining, by the control unit, a total number of control sample aliquots and an aliquot volume for each control sample aliquot based on a validation time schedule, wherein each aliquot volume comprises a dead volume and a volume comprising a determined number of control samples each with a volume required for validating the diagnostic test once, wherein the validation time schedule comprises a defined time period and at least one time segment, wherein the validation time schedule defines for each of the at least two analyzers (50, 52) and for each of the at least one time segment a number of validation time points at which a control sample aliquot is scheduled to be transported to one or more of the at least two analyzers (50, 52) for validating the diagnostic test by measuring one control sample of the control sample aliquot b) providing one or more vessels containing the total control sample volume to the aliquoting device, wherein the total control sample volume is at least the sum of aliquot volumes of the total number of control sample aliquots c) generating, by the aliquoting device, the determined total number of control sample aliquots with the determined aliquot volumes d) controlling, by the control unit, the transport system to transport at least one control sample aliquot to the storage or to one of the at least two analyzers (50, 52) for validating the diagnostic test by measuring one control sample of the at least one control sample aliquot according to the validation time schedule.