Microfluidic dialysis device

A test module for analyzing a biological sample, the test module comprising:

• an outer casing with a receptacle for receiving the sample;
• a dialysis device with a first channel in fluid communication with the receptacle for receiving the biological sample, a second channel, a series of adjacent channels extending between the first channel and the second channel, and a bypass channel between the first channel and the second channel, each of the adjacent channels being configured to pin a meniscus of the sample that arrests capillary flow between the first channel and the second channel, and the bypass channel joining the second channel upstream of the adjacent channels and is configured for uninterrupted capillary driven flow from the first channel to the second channel such that flow from the bypass channel reaches the meniscus pinned at each of the adjacent channels after the meniscus has formed to sequentially remove each of the menisci and allow flow from the first channel to the second channel via the adjacent channels as well as the bypass channel;
• and,
• a lab-on-a-chip (LOC) device being in fluid communication with the dialysis device and configured to analyze the pathogens.