A method for supplying consumable items to an automated sample analyzer is presented. The automated analyzer comprises a consumable repository including two or more storage areas. Each area is configured to store a plurality of consumable items. The method comprises receiving one or more orders for analytical tests to be carried out by the analyzer, reserving consumable items corresponding to one or more sets of consumable items required for the analytical tests in a first area, switching to a second area for reserving consumable items in response to determining that a predetermined consumable item in the first area has been reserved, supplying the reserved consumable items for use in the one or more analytical tests and indicating that the first area can be replenished in response to determining that a particular consumable item of the first storage area has been used.