A method for analyzing one or more analytes contained in plasma or serum separated from a blood sample, in particular for analyzing one or more of a parasite, a virus, cell free DNA, one or more proteins and/or one or more metabolites, the method comprising: a) separating plasma or serum from a blood sample using a device comprising: a housing with a housing base, a separation member configured to separate plasma or serum from cellular blood components by retaining said cellular blood components, wherein said separation member has a separation member upper surface and an opposing separation member lower surface, wherein said separation member upper surface or a portion thereof is configured to receive the blood sample, an extraction member for extracting the separated plasma or serum from the separation member, a sample introduction member, said sample introduction member being disposed above the separation member and having a configuration that allows the blood sample to be applied onto the separation member upper surface, and a desiccant; wherein the device is configured to be provided in a first configuration and in a second configuration by rotating the sample introduction member and the housing base against each other for a predefined angle; wherein, in the first configuration, the lower surface of the separation member is in contact with an upper surface of the extraction member; and wherein, in the second configuration, the desiccant is positioned directly above the extraction member; b) introducing the blood sample; c) separating the plasma or serum by waiting for a predetermined period of time; d) desiccating the separated plasma or serum in the extraction member by the desiccant; e) dissolving a desiccation product resulting from step d) in an aqueous solution; and f) analyzing the one or more analytes in the separated plasma or serum. a) separating plasma or serum from a blood sample using a device comprising: a housing with a housing base, a separation member configured to separate plasma or serum from cellular blood components by retaining said cellular blood components, wherein said separation member has a separation member upper surface and an opposing separation member lower surface, wherein said separation member upper surface or a portion thereof is configured to receive the blood sample, an extraction member for extracting the separated plasma or serum from the separation member, a sample introduction member, said sample introduction member being disposed above the separation member and having a configuration that allows the blood sample to be applied onto the separation member upper surface, and a desiccant; wherein the device is configured to be provided in a first configuration and in a second configuration by rotating the sample introduction member and the housing base against each other for a predefined angle; wherein, in the first configuration, the lower surface of the separation member is in contact with an upper surface of the extraction member; and wherein, in the second configuration, the desiccant is positioned directly above the extraction member; a housing with a housing base, a separation member configured to separate plasma or serum from cellular blood components by retaining said cellular blood components, wherein said separation member has a separation member upper surface and an opposing separation member lower surface, wherein said separation member upper surface or a portion thereof is configured to receive the blood sample, an extraction member for extracting the separated plasma or serum from the separation member, a sample introduction member, said sample introduction member being disposed above the separation member and having a configuration that allows the blood sample to be applied onto the separation member upper surface, and a desiccant; wherein the device is configured to be provided in a first configuration and in a second configuration by rotating the sample introduction member and the housing base against each other for a predefined angle; wherein, in the first configuration, the lower surface of the separation member is in contact with an upper surface of the extraction member; and wherein, in the second configuration, the desiccant is positioned directly above the extraction member; b) introducing the blood sample; c) separating the plasma or serum by waiting for a predetermined period of time; d) desiccating the separated plasma or serum in the extraction member by the desiccant; e) dissolving a desiccation product resulting from step d) in an aqueous solution; and f) analyzing the one or more analytes in the separated plasma or serum.