Real lab failures, root causes, and fixes — curated and bilingually annotated by our team.
Uniformly elevated background across plate with high coefficient of variation. Background may be particularly high in wells with lower antigen concentrations.
High background signal with poor signal-to-noise ratio. Standard curve may show compressed dynamic range or plateau at lower concentrations than expected.
Rapid color development with all wells turning dark quickly. Signal may exceed linear range of reader (OD >2.0). Background wells show significant color development.
Visible precipitate or cloudiness appears in wells immediately or shortly after substrate addition. Absorbance readings may be abnormally high or variable.
Very high signals across all wells including low-concentration standards. Loss of discrimination between different antigen concentrations. Background approaches signal levels.
High background with retained signal in negative controls. Edge wells may show higher background than center wells. Residual reagents visible in wells.
Random high background in specific wells or patterns. Fingerprints, dust, or residue visible on plate bottom. Erratic readings not following expected pattern.
Elevated background signal across wells, including negative controls. Signal appears uniformly high rather than specific to target-containing wells.
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