Abstract: A method and apparatus for detecting clot lysis, comprising allowing a blood sample containing a plasminogen activator to traverse a capillary track, wherein the capillary track contains a reagent capable of initiating blood clotting and the sample contacts the reagent as the sample flows through the track, the capillary track being of sufficient length and sufficiently small volume to allow blood to clot in the track before the sample reaches the end of the track and while a reserve sample volume remains available for continued capillary flow; allowing the sample to clot in the capillary track; and measuring time required for the sample to resume flowing as a measure of clot lysis.