Diagnostic test device including photodetector and tether

摘要

A diagnostic test device comprising means for sampling a liquid biological sample, means for reacting the sample with at least one reagent to provide one or more visible indicia and an optical detector for detecting the presence of said one or more indicia, the device further comprising a releasable tether which is released by contact with the liquid sample, thereby to cause the optical detector to detect the said one or more indicia.