A white blood cell (WBC) enrichment was obtained using PCRopsis Blood Cell Separator and PCRopsis Blood Cell Separator Nano. This enrichment was then incubated with the PCRopsis Concentrator for 5 minutes. The top left graph shows that incubation of a WBC sample with the PCRopsis Concentrator results in a concentration of WBCs compared to the identical sample not incubated with the PCRopsis Concentrator. In addition, the top right graph shows that incubation of the WBC sample with the PCRopsis Concentrator does not alter the distribution of cell types compared to the same sample not incubated with the PCRopsis Concentrator. Together, these studies demonstrate that the PCRopsis Concentrator selectively absorbs water from samples without negatively affecting cell counts or altering cell distributions.