Real lab failures, root causes, and fixes — curated and bilingually annotated by our team.
Gradual change in signal intensity across the plate suggesting time-dependent variation during assay setup
Wells at the edge of the plate show different readings compared to central wells
Consistently low optical density readings across entire plate including standards
Inconsistent results between different assay runs with same samples
Duplicate wells showing inconsistent results with high variation between replicates
Standard curve achieved but shows low or flat curve with poor discrimination between concentration points
Whole plate turned uniformly blue indicating non-specific signal saturation
No detectable signal across the entire plate when signal is expected
Elevated background noise across the ELISA plate making it difficult to distinguish specific signals from non-specific binding
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