Real lab failures, root causes, and fixes — curated and bilingually annotated by our team.
Negative control populations (e.g., monocytes, unstained cells) show unexpectedly high fluorescence signal, reducing separation from true positive cells.
Cells display low Forward Scatter (FSC) and Side Scatter (SSC) values. Populations appear poorly defined or compressed in scatter plots.
Flow cytometer detects very weak or absent fluorescence from stained cells. Expected positive population shows minimal or no signal separation from unstained controls.
Histogram for DNA content does not show distinct G0/G1, S, and G2/M phase peaks. Peaks are broad with high coefficients of variation (CVs).
Red blood cell debris persists in whole blood samples after lysis protocol, causing high background and interfering with target cell population analysis.
All cell populations including negative controls show elevated fluorescence, reducing signal-to-noise ratio and making it difficult to distinguish positive from negative populations.
Antibody validated for Western blot or immunofluorescence shows no signal or high background when used in flow cytometry protocol.
Off-target cell populations such as monocytes show unexpectedly high fluorescence signal. Non-specific staining obscures true positive populations.
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