A minimally invasive dried blood spot biomarker test for the detection of Alzheimer's disease pathology
Huber et al.
The finding, in our words
The study found that capillary dried plasma spots correlated strongly with venous plasma for detecting the Alzheimer's disease biomarker p-tau217. This suggests that microsampling offers a viable, minimally invasive alternative to venipuncture for screening and monitoring Alzheimer's disease pathology.
A paraphrase to the Library’s standard, never the abstract. The source is one link away and is always the authority.
Capillary dried blood spots, after haematocrit-dependent conversion, showed good agreement with plasma for 25-hydroxyvitamin D quantification, with 90 per cent of results within 20 per cent of plasma and substantial to almost perfect agreement in status classification, supporting reliable home self-collection for large-scale vitamin D monitoring.
Heughebaert et al., Clinical chemistry and laboratory medicine (paywalled) · source ↗
This study validated a dried blood spot method for tacrolimus monitoring and demonstrated agreement with venous whole blood measurements in kidney transplant recipients. It also found that dried blood spot analysis of the biomarker CXCL-10 was elevated in patients experiencing rejection or infection, supporting its use for decentralised monitoring.
Capillary finger-stick dried blood spots demonstrated strong analytical agreement with venous serum for prostate-specific antigen (R² = 0.987) and remained stable for 31 days across a wide temperature range. This less invasive microsampling approach enables at-home self-collection, supporting decentralised screening and tele-diagnostics for prostate cancer.
van Vugt et al., The journal of applied laboratory medicine (paywalled) · source ↗
ALAS2 and CA1 mRNA were reliably quantified from venous-cellulose, capillary-cellulose and Tasso-M20 dried blood spots with strong linear agreement (r ≥ 0.96) and no bias for ALAS2. CA1 showed modest proportional bias of 9-22% only when Tasso-M20 was compared with cellulose cards in the rEPO cohort, but no significant differences in relative expression across matrices were observed at any timepoint. These findings support decentralised capillary sampling for longitudinal anti-doping monitoring.
Bejder et al., Drug testing and analysis · source ↗
This study validated a method for measuring the alcohol biomarker phosphatidylethanol using two volumetric absorptive microsampling devices, finding that the Mitra device met all validation criteria and agreed with venous sampling. The Capitainer device was deemed suitable but showed reduced accuracy at higher concentrations, with a small proportional negative bias compared to venous results.
Andreassen et al., Journal of analytical toxicology (paywalled) · source ↗