fluorescence resonance energy transfer homogeneous time resolved fluorescence Homogenous time resolved fluorescence (HTRF) is a technology which combines standard FRET technology with the time-resolved measurement of fluorescence. Through this, HTRF eliminates the short-lived background fluorescence. Introducing a time delay (50-150 micro seconds) between the system excitation and fluorescence measurement, which allows the signal to be cleared of all non-specific short lived emissions. HTRF