Flow –Through tests are based on the principle of Immuno-filtration. The test principle involves a flow of fluid containing the analyte through a porous membrane and into an absorbent pad. Immuno-filtration membranes are especially useful for making antibody detection tests and also for quantitative detection of proteins.

It is a very rapid test and takes around 3 to 5 minutes, however test needs to be performed individually and require constant attention.

As with other membranes used in diagnostic assays, point to point uniformity and reproducibility from lot to lot are key requirements. This is particularly important when membranes act as support for quantitative assays. mdi Immunofiltration membranes exhibits extraordinary point to point uniformity and reproducibility allowing production of high quality tests with a low coefficient of variation (CV) of the measured readings.