Real lab failures, root causes, and fixes — curated and bilingually annotated by our team.
Spots merge together and become indistinguishable, making it impossible to count individual cytokine-secreting cells. This results in large, confluent areas instead of discrete spots.
Non-specific spots appear in negative control wells or throughout the plate. Background signal is elevated, making spot discrimination difficult.
Few or no spots are visible after development, or spots are extremely faint and difficult to detect even though cytokine-secreting cells should be present.
Spots lack sharp borders and appear fuzzy or poorly defined, making automated or manual counting difficult. The reader has trouble distinguishing individual spots.
The entire membrane has excessive background color development, reducing contrast between spots and background. Spots may be obscured by high background signal.
Results vary significantly between wells that should be replicates. Edge wells often show different spot counts or characteristics compared to central wells, creating systematic position-dependent effects.
Membrane shows physical damage, scratches, or irregular patterns. Spots may appear distorted or artifacts present as non-specific signals.
Spots develop with white or lighter centers surrounded by darker rings, creating a donut-like appearance. This is more common with enzymatic detection methods.
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