Global health surveillance relies on accurate, scalable, and cost-effective methods to monitor disease and population health trends; especially in areas with limited resources. Dried blood spot (DBS) technology is increasingly becoming a vital part of this toolkit. Thanks to its portability, durability, and minimal requirements for storage or transport, DBS sampling makes it possible to gather reliable data even in the most remote locations.
This article explores how dried blood spots are used in global health surveillance programs and why they are uniquely suited to support public health efforts around the world.
Health surveillance is essential for understanding and controlling diseases, tracking outbreaks, and evaluating health interventions. In global contexts, particularly in low-resource or geographically isolated regions, traditional blood sampling methods can be impractical. Venipuncture requires trained personnel, refrigeration, and quick transport to centralized laboratories. It can also reduce participation rates.
DBS technology overcomes many of these barriers, enabling wider participation in surveillance initiatives and expanding the reach of public health efforts.
Learn More: How Accurate are Dried Blood Spot Kits?
Dried blood spot cards offer several key advantages that make them ideal for global health surveillance:
These attributes allow for effective sample collection from diverse populations, including rural villages, urban slums, and refugee camps: anywhere that traditional phlebotomy isn’t feasible.
One of the most common global applications of DBS sampling is in the detection and tracking of infectious diseases. Because a dried blood spot retains antibodies, viral DNA/RNA, and other analytes, it can be analyzed using highly sensitive laboratory methods such as ELISA or PCR.
Global health programs have used DBS to monitor:
For example, during HIV surveillance campaigns in sub-Saharan Africa, DBS cards have enabled health agencies to test thousands of people without the need for complex cold-chain logistics. This same model is now being applied to emerging diseases and vaccine surveillance.
In addition to infectious diseases, DBS sampling plays a growing role in broader population health studies. Biomarkers measurable from dried blood spots can reflect:
This makes DBS ideal for nutritional surveys, maternal-child health monitoring, longitudinal cohort studies in resource-limited settings, and DHS/MICS surveys (demographic and health surveys/multiple indicator cluster surveys). For example, UNICEF and WHO have partnered with local governments to use DBS samples in mass health surveys, assessing anemia, iodine deficiency, or vitamin D status in children and pregnant women.
Rolling out DBS collection in a global health context involves several logistical and technical considerations:
Organizations that manufacture DBS kits, like RDA Spot, design materials for rugged field conditions and streamlined logistics, ensuring sample integrity across long distances and varied climates.
Maintaining analytical accuracy in field-collected DBS samples requires:
When these systems are in place, DBS-based testing delivers data comparable in quality to conventional venous samples, making it suitable for regulatory use and high-impact decision-making.
As the world faces new challenges in pandemic preparedness, antimicrobial resistance, and chronic disease surveillance, DBS technology offers a flexible, cost-effective solution. It makes population-scale testing possible even in environments where laboratory infrastructure is limited, empowering global health programs to act quickly and decisively.
Whether it’s detecting the next outbreak, monitoring vaccination efficacy, or tracking nutritional deficiencies, dried blood spot sampling is helping health systems worldwide reach more people, and generate more reliable data, than ever before.