Dried blood spot (DBS) testing is a microsampling method where a few drops of blood are collected on filter paper and dried. This minimally invasive approach has evolved from a neonatal screening tool into a versatile technique used across medicine, research, and industry. Its advantages — including ease of collection, sample stability, and low biohazard risk — make DBS an increasingly valuable resource. Below, we explore ten major applications that highlight the breadth of dried blood spot testing.
The first widespread use of DBS was in newborn screening. A heel-prick sample, collected on a Guthrie card, enables detection of inherited metabolic and genetic disorders such as phenylketonuria and congenital hypothyroidism. Nationwide adoption of DBS screening programs has ensured early detection and treatment for countless infants, preventing severe complications later in life.
DBS technology plays a key role in detecting infections like HIV, hepatitis B and C, and other communicable diseases. Because dried samples are stable at room temperature, they can be collected in remote areas and mailed to central laboratories. DBS has been endorsed by the World Health Organization as an accessible diagnostic tool, expanding testing coverage in resource-limited settings.
Monitoring blood concentrations of medications with narrow therapeutic windows, such as anticonvulsants, antibiotics, or immunosuppressants, is vital. DBS provides a practical way to perform routine checks without requiring venous blood draws. Correlation studies have confirmed that DBS drug levels align closely with traditional plasma measurements, supporting its use in personalized medicine.
In drug development, DBS enables rich pharmacokinetic (PK) sampling while minimizing blood volume requirements. With each spot holding approximately 50–80 µL of blood, researchers can collect frequent time-point samples, even in pediatric or outpatient studies. DBS cards are stable during shipment without refrigeration, streamlining multicenter trial logistics.
The World Anti-Doping Agency officially approved DBS for doping control in 2021, and it was fully introduced at the 2022 Winter Olympics. A small finger-prick sample allows for easier, less invasive testing compared to venous blood draws. While DBS currently complements rather than replaces urine and plasma tests, its efficiency and athlete-friendly collection process are driving broader adoption.
DBS kits enable patients to collect their own samples at home. Tests for cholesterol, lipid panels, or HbA1c in diabetes management can now be completed without a clinic visit. Patients mail their dried samples to laboratories for analysis, improving access to healthcare and supporting telemedicine initiatives. RDA Spot’s CE-marked DBS kit exemplifies how self-collection can expand diagnostic reach.
Large-scale seroprevalence studies often use DBS cards to gather population-wide health data. Because samples remain stable during mailing and storage, they are ideal for monitoring antibody levels during outbreaks or after vaccination campaigns. DBS has been employed in studies tracking immunity to diseases such as measles and COVID-19, enabling rapid data collection from diverse populations.
DBS cards also provide insights into environmental exposures. Blood spots can be analyzed for heavy metals, pollutants, or biomarkers of toxic exposure. This approach has been used in community-based studies where venous sampling is impractical, as well as in forensic toxicology for post-mortem or substance-use testing.
The advantages of DBS extend beyond human medicine. Veterinarians and researchers use DBS to test animals, particularly in wildlife conservation and livestock farming. Minimal sampling requirements make DBS especially useful for small or endangered species, where traditional blood collection may not be feasible.
Stored DBS samples are valuable for future research. Neonatal screening cards are often archived, and decades-old samples have been re-analyzed to investigate emerging diseases or historical exposures. Properly stored DBS cards remain stable over long periods, enabling retrospective studies that provide unique insights into population health trends.
Dried blood spot testing has grown from its origins in newborn screening to a multipurpose tool used across clinical medicine, research, and population health. Its versatility lies in its simplicity: a few drops of blood on paper can unlock vital information. With RDA Spot advancing reliable collection technologies, DBS continues to expand opportunities for diagnostics, monitoring, and discovery.
Connect with RDA Spot to explore how our DBS solutions can strengthen your clinical, research, or public health programs.