Real lab failures, root causes, and fixes — curated and bilingually annotated by our team.
Flow cytometry data shows elevated background fluorescence and false-positive signals, particularly in populations with high Fc receptor expression (monocytes, macrophages, dendritic cells, B cells, NK cells). Antibodies bind to cells lacking the target antigen.
Persistent high background staining and false positives despite applying Fc blocking reagent. Staining pattern shows non-specific binding to Fc receptor-expressing cells even after blocking step.
Inconsistent blocking efficiency with variable background staining across experiments. Either insufficient reduction in non-specific binding or interference with specific antibody-antigen interactions.
Reduced blocking efficacy with higher than expected background despite using Fc blocking reagent. Non-specific staining patterns similar to samples without Fc block.
Inability to distinguish whether observed staining is specific or due to incomplete Fc blocking. Uncertainty about blocking efficacy and data interpretation.
Progressive decline in Fc blocking efficacy over time with the same reagent lot. Previously effective blocking protocol shows increasing background in recent experiments.
Severe background noise and false positives specifically in immunology panels analyzing monocytes, macrophages, NK cells, or dendritic cells. Data quality deteriorates compared to other cell types.
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