Abstract: A centrifugal analyzer has a support for receiving a multicuvette rotor that defines a circumferential array of cuvettes, the analysis regions of the rotor being disposed circumferentially about the periphery of the support when the rotor is on the support. The rotor support is driven in rotation to subject the cuvettes to centrifugal force to position reaction products in respective analysis regions of the cuvettes for analysis, all of the analysis regions being moved along a fixed circular path as the drive means drives the rotor support.