In some embodiments of the invention, the central controller may comprise a processor and a computer readable medium coupled to the processor. The computer readable medium comprises code, executable by the processor to implement a method. The method comprises identifying, by the processor, a sample container or a sample container holder associated with the sample container, and then accessing, by the processor, a location database storing mapping data correlating sample containers or sample container holders with sample containers to test regions in the storage unit. The test regions store sample containers with samples that have been or are to be tested according to different tests. After accessing the database, the method continues by providing, by the processor, a proposal for storage of the sample container or the sample container holder associated with the sample container in the storage unit.