Microfluidic system, device and method

A microfluidic system comprising:

• a body structure comprising
• (a) a first outer layer forming a first side of the body structure;
• (b) a second outer layer forming a second side of the body structure;
• (c) a microfluidic assembly comprising at least a first substrate layer and disposed between the first outer layer and the second outer layer;
• (d) a first port disposed through the first outer layer and in fluid communication with the microfluidic assembly;
• and
• (e) a second port disposed through either the first outer layer or the second outer layer and adapted to be attached to a vacuum source such that a fluid flow path is defined from the first port to the second port through the microfluidic assembly;
• wherein the microfluidic assembly comprises:
• (i) a reaction chamber manifold and a waste reservoir;
• and
• (ii) two or more parallel fluid flow paths between the reaction chamber manifold and the waste reservoir, wherein each fluid flow path comprises at least one reaction chamber comprising a dried film, a paper, or a gel comprising one or more test reagents, and wherein the at least one reaction chamber is adapted for an optical measurement;
• wherein the reaction chamber manifold is on a sample supply inlet of each of the two or more fluid flow paths;
• wherein the reaction chamber manifold on the sample supply inlet of each of the two or more fluid flow paths has a volume greater than the volume of the at least one reaction chamber;
• wherein the waste reservoir has a volume greater than the volume of the at least one reaction chamber;
• and
• wherein the microfluidic assembly:
• (i) is configured to be inserted into a toilet;
• (ii) is configured to be attached to a toilet;
• (iii) is inside a toilet bowl, a toilet base, a toilet bowl rim, or a toilet tank;
• (iv) is attached to a toilet bowl, a toilet base, a toilet bowl rim, or a toilet tank;
• (v) operates at least in part, inside a toilet bowl, a toilet base, a toilet bowl rim, or a toilet tank;
• (vi) is configured to be stored on or in a toilet;
• (vii) is configured to be stored on or in a toilet bowl, a toilet base, a toilet bowl rim or a toilet tank;
• (viii) is configured to be placed on or in a toilet;
• or
• (ix) is configured to be placed on or in a toilet bowl, a toilet base, a toilet bowl rim, or a toilet tank.