Early detection and regular monitoring are critical in diabetes care. When identified at the prediabetes stage, type 2 diabetes can often be delayed or even reversed with lifestyle changes. For those with established diabetes, consistent tracking of blood glucose control reduces the risk of complications.
Dried blood spot (DBS) testing is emerging as a practical, validated tool for both screening and monitoring. By enabling HbA1c and other diabetes-related markers to be measured from a simple finger prick, DBS expands access to testing while maintaining clinical accuracy.
The Role of HbA1c in Diabetes Diagnosis
Hemoglobin A1c (HbA1c) is a cornerstone biomarker for diagnosing and managing diabetes. It reflects average blood glucose levels over the past 2–3 months and does not require fasting. Traditionally, HbA1c has been measured from venous blood samples, which can be a barrier for at-risk individuals who do not visit a lab.
DBS technology addresses this gap. Studies demonstrate that HbA1c measured from capillary blood spots correlates strongly with venous samples. Key findings include:
- Strong correlation: A meta-analysis of 17 studies confirmed excellent agreement between DBS and venous HbA1c results.
- Stability: DBS HbA1c results remain accurate for up to 22 days at room temperature.
- Clinical equivalence: With proper calibration, DBS values are interchangeable with standard lab results in most cases.
This means that at-home DBS HbA1c tests can provide the same clinically actionable data as in-clinic draws.
Expanding Accessibility Through DBS
DBS testing increases screening reach, particularly for underserved populations:
- Remote access: Patients in rural or low-resource areas can collect samples at home and mail them in.
- Telemedicine integration: During the COVID-19 pandemic, DBS HbA1c enabled continuity of care when in-person visits were restricted.
- Community programs: Public health initiatives can mail DBS kits to high-risk groups, boosting early detection rates.
Recent validations, including one that confirmed self-collected DBS HbA1c was acceptable for clinical measurement and effectively increased accessibility to diabetes monitoring, show this approach is suitable for routine clinical use and can expand the availability of regular monitoring and diagnostic testing. In other words, this method can bring diagnostic capabilities to the patient, rather than requiring the patient to come to the diagnostics.
Monitoring Diabetes with DBS
For patients with type 1 or type 2 diabetes, HbA1c testing every 3–6 months is recommended. DBS simplifies this process, allowing interim tests between clinic visits. Applications include:
- Treatment adjustments: Providers can fine-tune therapy based on updated results.
- Lifestyle impact: Patients can track the effect of diet, exercise, or weight loss on HbA1c.
Personalized Trends and Supplementation
Many patients are exploring dietary strategies and supplements to support glucose control. DBS testing allows these efforts to be objectively tracked.
- Berberine: Clinical studies show HbA1c reductions of 1–2% over three months, comparable to metformin.
- Nutrients: Vitamin D and omega-3 fatty acids have been linked to improved insulin sensitivity.
- NAD research: Emerging studies, including LifeLab1 investigations, suggest metabolic markers beyond glucose may play a role in diabetes risk.
A comprehensive at-home test might allow a diabetic individual to monitor not just their HbA1c but also such nutritional biomarkers, and then optimize their diet or supplements accordingly. This converges with the personalized nutrition approach: for example, if a person’s DBS test shows low vitamin D and high HbA1c, addressing that deficiency (perhaps through increased supplementation and then verifying improvement in both D level and HbA1c later) could be a targeted intervention.
Reliability and Safety of DBS for Diabetes
Of course, accuracy is paramount when dealing with medical tests. The good news is that the scientific community has extensively studied DBS for diabetes-related measurements and found it reliable. DBS testing is well-validated for diabetes monitoring:
- Precision: HbA1c assays from DBS show intra-assay variability under 3%, consistent with venous testing.
- Stability: Dried samples remain accurate for a long time.
- Safety: Dried specimens reduce biohazard risk and simplify transport.
- Proven history: DBS sampling has been used reliably for decades in newborn screening programs.
These attributes make DBS both practical and trustworthy for clinical and self-monitoring applications.
Diabetes Testing with LifeLab1
Dried blood spot testing is redefining how diabetes is detected and managed. By enabling accurate HbA1c and related biomarker testing from home, LifeLab1’s DBS tests lower barriers to diagnosis, support remote patient monitoring, and empower individuals to take an active role in their care.
For healthcare professionals, DBS offers a validated and scalable tool to expand screening programs and improve continuity of care. For patients, it provides accessible, data-driven feedback that makes managing diabetes more practical and personalized.
References
- Mastronardi CA, Whittle B, Tunningley R, Neeman T, Paz-Filho G. The use of dried blood spot sampling for the measurement of HbA1c: a cross-sectional study. BMC Clin Pathol. 2015 Jul 8;15:13. doi: 10.1186/s12907-015-0013-5. PMID: 26157353; PMCID: PMC4495815.
- A Naranjo, C Carter, A-059 Validation of self-collected capillary dried blood spot collection for clinical HbA1c testing, Clinical Chemistry, Volume 70, Issue Supplement_1, October 2024, hvae106.058, https://doi.org/10.1093/clinchem/hvae106.058
- Yin J, Xing H, Ye J. Efficacy of berberine in patients with type 2 diabetes mellitus. Metabolism. 2008 May;57(5):712-7. doi: 10.1016/j.metabol.2008.01.013. PMID: 18442638; PMCID: PMC2410097.
