Real lab failures, root causes, and fixes — curated and bilingually annotated by our team.
Cell-free DNA extraction yields are lower than expected. This may manifest as insufficient DNA concentration measured by fluorometry or qPCR, preventing downstream analysis.
DNA yield is consistently lower than expected across multiple extractions. The binding capacity appears reduced, with proportionally less DNA recovered relative to input sample volume.
Cell-free DNA yield is suboptimal despite proper bead addition and reagent preparation. A significant portion of DNA may remain unbound in the supernatant during the binding step.
DNA yield is lower than expected, or downstream applications show inhibition. Under-dried beads may carry over ethanol or contaminants, while over-dried beads result in poor DNA release during elution.
Final DNA concentration is lower than expected despite successful binding and washing. A significant portion of DNA remains bound to the beads after the elution step.
Variable or reduced cfDNA yields across samples. Beads may be visible in wash supernatants or final eluate, or yield decreases progressively through the protocol.
Consistently low cfDNA yields despite optimized extraction protocol. This pattern may occur across specific sample types or patient cohorts, reflecting biological rather than technical causes.
Visible brown particles or turbidity in the final DNA eluate. This may cause downstream assay interference, optical measurement errors, or sequencing library preparation issues.
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