Patent ID: 7959861

Claim:
A device for analyzing a fluid sample for the presence of a target, the device comprising: an injection port; a reaction region fluidly communicating with the injection port via a microfluidic channel; a target concentration mechanism confined within the reaction region, the target concentration mechanism being configured to releasably immobilize a labeled receptor known to bind one or more classes of targets; wherein, under a first condition, the receptor is immobilized within the reaction region; and under a second condition, the receptor is released by the target concentrating mechanism and free to travel away from the reaction region; a detection region fluidly communicating with the reaction region via a microfluidic channel; a fluid manipulation source configured to control movement of the fluid sample from the injection port, through the reaction region and to the detection region; and a detector in communication with the detection region configured to differentiate between bound receptor and unbound receptor based on the timing of when the bound and unbound receptors move through the detection region.