Show Notes
Barra G et al., LabMed (2025) 2, 4 - A comparative study of blood collection tubes (EDTA, citrate, heparin, serum) from 15 healthy volunteers showing how anticoagulants affect baseline cell-free DNA, endogenous DNase activity, and cfDNA degradation over 24 hours at 37°C. Key terms: cell-free DNA, EDTA plasma, heparin plasma, citrate plasma, serum.
Study Highlights:
Baseline cfDNA was highest in serum and intermediate in heparin-plasma, while citrate- and EDTA-plasma had similarly low baseline cfDNA. Endogenous DNase activity was highest in heparin-plasma and serum, intermediate in citrate, and effectively inhibited in EDTA. After 24 h at 37°C, cfDNA degradation was greatest in heparin (85.3%) and serum (55.6%), with minimal loss in EDTA (8%) and low loss in citrate (13.3%). These results support EDTA-plasma as the preferred specimen for cfDNA analyses and caution against using heparin or serum.
Conclusion:
EDTA-plasma provides strong DNase inhibition and minimal cfDNA degradation and remains the gold standard for cfDNA analysis. Citrate-plasma shows partial DNase inhibition and low gDNA contamination and may be an acceptable alternative when EDTA is unavailable. Heparin-plasma and serum exhibit high DNase activity and substantial cfDNA degradation (plus known PCR inhibition for heparin), making them unsuitable for reliable cfDNA-based diagnostics.
QC:
This episode was checked against the original article PDF and publication metadata for the episode release published on 2025-04-16.
Scope: article metadata and core scientific claims from the narration, excluding analogies, intro/outro, and music.
Factual QC score: 10/10.
Metadata QC score: 10/10.
Supported core claims: 5.
Claims flagged for review: 0.
Metadata checks passed: 4.
Metadata issues found: 0.
QC result: Pass.
Music:
Enjoy the music based on this article at the end of the episode.
Article title:
Impact of Tube Additives on Baseline Cell-Free DNA, Blood Nuclease Activity, and Cell-Free DNA Degradation in Serum and Plasma Samples: A Comparative Study
First author:
Barra G
Journal:
LabMed (2025) 2, 4
DOI:
10.3390/labmed2010004
Reference:
Barra G.B.; Santa Rita T.H.; Jácomo R.H.; Nery L.F.A. Impact of Tube Additives on Baseline Cell-Free DNA, Blood Nuclease Activity, and Cell-Free DNA Degradation in Serum and Plasma Samples: A Comparative Study. LabMed 2025, 2, 4. https://doi.org/10.3390/labmed2010004
License:
Creative Commons Attribution (CC BY) 4.0
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Episode link: https://basebybase.com/episodes/tube-matters-how-additives-shape-cell-free-dna-stability
