Patent ID: 8470588

Claim:
A test element which is essentially disk-shaped, comprising: an axis within the test element which is perpendicular to the plane of the test element and about which the test element is rotated; a sample application opening for applying a liquid sample; a capillary-active zone having a first end that is remote from the axis and a second end that is near to the axis, wherein the capillary-active zone is a porous, absorbent matrix and comprises one or more zones containing one or more immobilized reagents which specifically capture an analyte or species derived from or related to the analyte from the liquid sample flowing through the capillary-active zone and also immobilize the analyte or the species in the capillary-active zone; and a sample channel which extends from the sample application opening over an area near to the axis to the first end of the capillary-active zone that is remote from the axis, and wherein the sample channel contains an erythrocyte collecting zone for the separation of cellular blood components and a serum or plasma collection zone.