The present invention is directed to methods, devices and kits for separating, accumulating, characterizing and/or identifying microorganisms in a test sample. The method of the invention includes optionally lysing non-microorganism cells and/or particulates that may be present in a test sample, followed by a subsequent filtration step for isolation and/or accumulation of microorganisms. The filtration and sample transfer device may be used for isolation and/or accumulation of microorganisms by filtration. Once the microorganisms have been filtered for isolation and/or accumulation, the microorganisms can be analyzed to acquire measurements for the characterization and/or identification of said microorganisms.