Performing a biochemical analysis, preferably in space with at least one analyte in a sample (12a) qualitatively and/or quantitatively by a selective binding of an analyte specific pair of a binding substance (14a), which fixes the analyte, and a detection substance (20a) that carries a marker substance for marking the analyte, comprises mixing the sample carrying the binding substance, the detection substance and the marking substance in a reaction vessel (26a), where the mixing step is carried out by mixing bodies (18a). An independent claim is included for an apparatus comprising a body for mixing the sample, the binding substance and the detection substance.