DNA marks look similar in finger-prick and vein blood
Chemical marking patterns on DNA correlated above 0.9 between finger-prick and vein blood samples from 20 adults aged 66–86.
Our read
Biomarkers- Studied:
- Cross-sectional study of 20 ethnically Vietnamese adults aged 66–86, against venous blood
- What changed:
- DNA methylation did not differ between capillary and venous blood
- The catch:
- Only 20 adults were compared, which could miss subtle differences between blood sources
- Why it’s aging research:
- It builds or tests a tool for aging research.
Editor of record: Boris Djordjevic · AgingResearch.News
An observational study compared matched finger-prick and vein blood samples from 20 ethnically Vietnamese adults aged 66–86, including 13 men and seven women. Researchers used a laboratory array to measure DNA methylation, a type of chemical marking on DNA.
Sample quality was similar for both blood sources. The analysis found no detectable methylation differences at individual DNA sites by blood source. Fourteen methylation-based predictors, including epigenetic clocks that estimate age from DNA marks and predictors related to inflammation, did not differ significantly between sources. The authors suggested that finger-prick and vein blood results may be comparable in large-scale DNA methylation studies.
Why it matters
Aging research uses epigenetic clocks to study biological aging. Comparing blood sources addresses whether collection methods could complicate comparisons of these measures across studies.
Caveats
This small observational comparison could miss subtle differences between blood sources. It involved older adults from northern Vietnam, so it does not establish comparability in younger people or other populations.
The paper
University of British Columbia
iScience, May 18, 2026, Open access
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