Inherently Low cfDNA Yield from Sample Limitations (Cell-free DNA Extraction)

Question

Accepted Answer

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. Common causes: 1) Sample collection processes that result in reduced cfDNA release or preservation 2) Biological variability in cfDNA shedding rates across individuals or disease states 3) Low plasma or serum volume available for extraction 4) Sample degradation during collection, transport, or storage prior to extraction Solutions: 1) Increase sample input volume to compensate for low cfDNA concentration 2) Review and optimize pre-analytical sample collection and handling procedures 3) Verify sample storage conditions and minimize freeze-thaw cycles 4) Consider using specialized collection tubes designed for cfDNA preservation 5) Document sample characteristics and clinical context to distinguish biological from technical factors