Early Detection of β-Cell Decline Using Home Dried Blood Spot C-Peptide Levels in New-Onset Type 1 Diabetes
Hendriks et al.
The finding, in our words
A study of 292 patients found that the slopes of home-collected stimulated dried blood spot C-peptide levels over six months predicted 12-month venous mixed-meal tolerance test results, P<0.001. This shows decentralised microsampling can monitor beta-cell function, though further validation is required to confirm its reliability and broader applicability.
A paraphrase to the Library’s standard, never the abstract. The source is one link away and is always the authority.
The study found that although participants preferred patient-centric microsampling devices for home use, the agreement with venous plasma for measuring CRP and cytokines was inconsistent, indicating that further validation is required before these methods replace standard venipuncture.
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.
Frequent dried blood spot sampling detected early changes in beta-cell function more effectively than mixed-meal tolerance tests or urine ratios, supporting its potential as a decentralised monitoring tool for clinical trials.
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.
The study found that coached dried blood spot collection was feasible for remote biobehavioural assessment of CTRA gene expression among Black women activists, with usable data from 28 of 29 participants at baseline and 27 at follow-up. Within-person increases in activist identity and search for meaning were associated with more favourable CTRA gene expression changes, though mean CTRA did not shift across the group over the two-month period.