Real lab failures, root causes, and fixes — curated and bilingually annotated by our team.
Flow cytometry data shows weak or absent fluorescence signals from labeled antibodies following fixation step. Expected positive populations appear dim or shift toward negative, compromising detection sensitivity.
Flow cytometry analysis reveals increased non-specific fluorescence across all populations following fixation. Negative control cells show elevated signal, reducing signal-to-noise ratio and obscuring true positive events.
Specific fluorophores show dramatic signal loss or complete disappearance after fixation while others remain intact. Tandem dyes or photosensitive fluorophores particularly affected, resulting in spectral overlap changes and compensation errors.
Forward scatter (FSC) and side scatter (SSC) profiles show abnormal patterns after fixation. Cell populations cluster abnormally, size measurements are inconsistent, and gating strategies based on morphology fail to resolve expected populations.
Intracellular markers such as cytokines, transcription factors, or phosphoproteins show no signal despite proper antibody validation. Surface markers stain normally, but internal targets remain undetected indicating permeabilization issues.
Samples fixed for next-day or multi-day analysis show progressive signal loss, increased debris, and population shifts compared to immediate analysis. Data quality deteriorates with storage time despite initial proper fixation.
Samples from infected or potentially hazardous sources show signs of incomplete inactivation, creating biosafety concerns during handling and flow cytometry analysis. Validation assays indicate residual infectious potential.
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