A microcuvette cartridge for optical measurement of a specimen includes: a substrate having a recess on an upper surface thereof to receive a fluid specimen therein, the substrate having a plurality of cavities therein to receive the fluid specimen transported from the recess, the substrate further defining a plurality of channels communicating with the recess and with the plurality of cavities, respectively, to transport the fluid specimen from the recess to the plurality of cavities, said substrate further having one or more of windows at positions corresponding to the plurality of cavities, the windows being transparent to wavelength of light with which the optical measurement is to be carried out so as to allow the light to interact with the fluid specimen in the cavities; and a transport mechanism to promote and complete flows of the fluid specimen from the recess to the plurality of cavities through the plurality of channels.