A multiple dose reagent pack and corresponding carousel for an automated analyzer are disclosed. The reagent pack contains a plurality of vial-receiving wells which receive and hold a plurality of reagent-containing vials to form a unitary reagent pack. The carousel contains a plurality of radially spaced compartments which are adapted to receive and hold either a reagent pack or a sample container. A corresponding plurality of reaction container openings are provided on the carousel. Reagent packs for specific assays can be selectively interspersed with sample containers in the compartments to provide a wide variety of test combinations.