The invention relates to a microfluidic element for analyzing a body liquid sample for an analyte contained therein, comprising a substrate (5) and a channel structure (2) enclosed by the substrate (5) and a cover layer, wherein the element can be rotated about a rotational axis. The channel structure (2) of the microfluidic element (1) encloses a feed channel (6) having a feed opening (9), a vent channel (10) having a vent opening (11), and at least two reagent chambers (12). The reagent chambers (13) are connected to each by means of two connecting channels (14) such that a fluid exchange is possible between the reagent chambers (13) and one of the reagent chambers (13) comprises an inlet opening (23), which is in fluid connection with the feed channel (6), so that a liquid sample can flow into the reagent chamber (13a) that lies farther away from the rotational axis. At least one of the reagent chambers (13) contains a reagent (35), which reacts with the liquid sample.