A lateral flow capillary device comprising: a housing having a proximal end and a distal end, the housing comprising an upper portion coupled to a lower portion, said upper and lower portions (1100, 1200) being reversibly engageable and defining a cavity in an interior of the housing, the cavity being at least partially defined by the lower portion of the housing; the cavity configured to receive a capillary flow matrix; a plurality of reservoirs (1116a-d) located at the upper portion of the housing, the plurality of reservoirs (1116a-d) being in flow communication with the cavity and configured to introduce a fluid to the capillary flow matrix; characterized in that: a pressure system is located at the lower portion of the housing and the capillary flow matrix, the pressure system being configured to apply a substantially uniform pressure on the capillary flow matrix to create a seal of the capillary flow matrix in the reservoirs (1116a-d) and ensure proper lateral flow from each of the reservoirs (1116a-d) into the capillary flow matrix, the pressure system comprising: at least a first pressure plate positioned in alignment with outlets of the plurality of reservoirs (1116a-d) to support a portion of the capillary flow matrix; and an elastically compressible structure comprising a spring located between the pressure plate and the lower portion and received by the cavity, the elastically compressible structure comprising a spring being biased to urge the first pressure plate toward the outlet of the plurality of reservoirs (1116a-d) in response to a force exerted on the first pressure plate in a direction toward the lower portion of the housing. a housing having a proximal end and a distal end, the housing comprising an upper portion coupled to a lower portion, said upper and lower portions (1100, 1200) being reversibly engageable and defining a cavity in an interior of the housing, the cavity being at least partially defined by the lower portion of the housing; the cavity configured to receive a capillary flow matrix; a plurality of reservoirs (1116a-d) located at the upper portion of the housing, the plurality of reservoirs (1116a-d) being in flow communication with the cavity and configured to introduce a fluid to the capillary flow matrix; characterized in that: a pressure system is located at the lower portion of the housing and the capillary flow matrix, the pressure system being configured to apply a substantially uniform pressure on the capillary flow matrix to create a seal of the capillary flow matrix in the reservoirs (1116a-d) and ensure proper lateral flow from each of the reservoirs (1116a-d) into the capillary flow matrix, the pressure system comprising: at least a first pressure plate positioned in alignment with outlets of the plurality of reservoirs (1116a-d) to support a portion of the capillary flow matrix; and an elastically compressible structure comprising a spring located between the pressure plate and the lower portion and received by the cavity, the elastically compressible structure comprising a spring being biased to urge the first pressure plate toward the outlet of the plurality of reservoirs (1116a-d) in response to a force exerted on the first pressure plate in a direction toward the lower portion of the housing. at least a first pressure plate positioned in alignment with outlets of the plurality of reservoirs (1116a-d) to support a portion of the capillary flow matrix; and an elastically compressible structure comprising a spring located between the pressure plate and the lower portion and received by the cavity, the elastically compressible structure comprising a spring being biased to urge the first pressure plate toward the outlet of the plurality of reservoirs (1116a-d) in response to a force exerted on the first pressure plate in a direction toward the lower portion of the housing.