Cartridge for stirring and dispensing a fluid, automatic analyzer and method of analyzing a biological sample

A cartridge for dispensing a fluid, wherein the cartridge comprises:

• a reservoir chamber configured for receiving the fluid, the reservoir chamber having a fluid outlet, wherein the reservoir chamber further comprises a cover with a first bearing;
• a stirring assembly comprising a stirrer located inside the reservoir chamber, the stirring assembly further comprising a shaft, the shaft being connected to the stirrer, the shaft further being located at least partially inside the reservoir chamber and the shaft being configured to transmit rotational power to the stirrer, wherein
• the first bearing is formed by a first end of the stirring assembly and the cover, and wherein a second bearing is formed by a surface at a second end of the stirring assembly and a surface of the fluid outlet, and
• the stirring assembly is configured to be moved between a first position and a second position, wherein in the first position the stirring assembly is operable to seal the fluid outlet, the stirring assembly in the first position further being operable to form the second bearing with the fluid outlet such that the stirrer can be rotated about an axis defined by the first and second bearing, and wherein if the stirring assembly is in the second position the fluid can pass through the fluid outlet.