High Non-Specific Background Signal in Competitive ELISA (ELISA (Competitive))

Question

Accepted Answer

Elevated background signal is detected across wells, interfering with specific signal measurement. Background noise reduces assay sensitivity and may mask low-concentration analyte detection. Common causes: 1) Detector conjugate binding non-specifically to the microplate surface 2) Excessive concentration of detector conjugate antibody 3) Inadequate blocking buffer composition or insufficient blocking incubation 4) Insufficient washing cycles or inadequate wash duration Solutions: 1) Run control wells with primary antibody and sample omitted to identify non-specific conjugate binding 2) Titrate and decrease the concentration of detector conjugate antibody 3) Optimize blocking by testing alternative blocking buffers or extending blocking time/temperature 4) Increase the number of wash cycles and/or extend wash duration per cycle