Microfluidic element for analyzing a fluid sample with a substrate and a microfluidic transport system having a channel structure, the microfluidic transport system being enclosed by the substrate and a covering layer, wherein - the channel structure comprises a channel (8, 13) with two side walls, and a chamber (9, 11) which adjoins the channel (8, 13), - the channel (8, 13) comprises a channel section and a valve section adjoining the channel section, - the two side walls run parallel to each other in the channel section, - the chamber (9, 11) has a chamber wall with an inlet orifice, - the inlet orifice in the chamber wall adjoins the valve section so that a fluid can flow out of the channel (8, 13) through the valve section into the chamber (9, 11), - the valve section has a fluid transport cross-section enlarging in flow direction which is larger than the fluid transport cross-section in the preceding channel section, and - the valve section and the adjoining chamber (9, 11) form a capillary stop constituting a geometric valve such that a fluid flowing through the channel (8, 13) is stopped at the end of the valve section at the inlet orifice of the chamber (9, 11), characterized in that - a rib is positioned in the valve section between the two valve section side walls such that two adjacent valve section sub-channels (41, 42) are formed, which both end at the chamber wall of the chamber (9, 11), wherein the distance of the first valve section sub-channel from the second valve section sub-channel at the chamber wall is at least twice as large as the width of the narrower valve section sub-channel (41, 42); and - the two adjacent valve section sub-channels (41, 42) each form a capillary stop with the chamber (9, 11) configured as a geometric valve. - the channel structure comprises a channel (8, 13) with two side walls, and a chamber (9, 11) which adjoins the channel (8, 13), - the channel (8, 13) comprises a channel section and a valve section adjoining the channel section, - the two side walls run parallel to each other in the channel section, - the chamber (9, 11) has a chamber wall with an inlet orifice, - the inlet orifice in the chamber wall adjoins the valve section so that a fluid can flow out of the channel (8, 13) through the valve section into the chamber (9, 11), - the valve section has a fluid transport cross-section enlarging in flow direction which is larger than the fluid transport cross-section in the preceding channel section, and - the valve section and the adjoining chamber (9, 11) form a capillary stop constituting a geometric valve such that a fluid flowing through the channel (8, 13) is stopped at the end of the valve section at the inlet orifice of the chamber (9, 11), characterized in that - a rib is positioned in the valve section between the two valve section side walls such that two adjacent valve section sub-channels (41, 42) are formed, which both end at the chamber wall of the chamber (9, 11), wherein the distance of the first valve section sub-channel from the second valve section sub-channel at the chamber wall is at least twice as large as the width of the narrower valve section sub-channel (41, 42); and - the two adjacent valve section sub-channels (41, 42) each form a capillary stop with the chamber (9, 11) configured as a geometric valve.