Electrochemiluminescence (ECL)  is a lab method where a small voltage makes special labels on antibodies emit light , and the instrument measures that light to quantify the target in the sample. Why labs like it Very sensitive and precise  for low concentrations Wide measuring range , fewer dilutions Fast & stable reagents , reliable calibration on Elecsys/ECLIA platforms How a Roche ECL immunoassay works Sample mixes with antibodies  (one carries a light-emitting ruthenium l