Centrifugal analyzer rotor unit and insert elements

In a centrifugal analyzer having a rotatably driven circular rotor base, the improvement comprising:

• a rotor head comprising at least one sample analysis insert element including a housing having a radially inner portion and a radially outer portion, first means forming at least one sample chamber at the inner portion of the housing, second means forming at least one measuring chamber at the outer portion of the housing, third means forming a fluid channel between the sample and measuring chambers along a radial path and at least one storage stable reagent disposed in the liquid channel;
• at least one sample obtaining insert element including a housing having a radially inner end and a radially outer end, means forming a cylinder within the housing and extending from the inner end to the outer end, a piston slidably movable in the cylinder, injection needle connection means disposed on the inner end in communication with the cylinder, an aperture at said outer end for receiving a piston rod and piston rod connecting means on said piston;
• and means releasably mounting each insert element on the rotor base at any one of a plurality of different selectable angular positions wherein the insert elements are positionally stable when the rotor base is rotating.