Dried blood spot (DBS) sampling is gaining traction in clinical diagnostics and bioanalytical research as laboratories move toward scalable microsampling workflows. Although this technique simplifies sample collection and transport, integrating DBS into high-throughput laboratory systems introduces important technical considerations. DBS cards must interact precisely with robotic handling equipment, automated punchers, and analytical instruments such as liquid chromatography-tandem mass spectrometry (LC-MS/MS). At the same time, workflow configuration and throughput capacity must support continuous processing. The alignment of these elements ensures DBS testing can function reliably within automated laboratories designed to manage large sample volumes.
High-throughput laboratory workflows rely heavily on automation to maintain consistent sample movement and processing speed. Within such systems, the physical characteristics of DBS cards, such as rigidity, thickness, and dimensional stability, directly influence how reliably robotic platforms can handle and transfer samples throughout the workflow.
Automated DBS workflows need robotic grippers to transfer DBS cards between stackers, punchers, and extraction modules. Robotic card-handling systems operate within tight mechanical tolerances, thus even minor variations in DBS card construction can disrupt automated sample handling. Inconsistent thickness, reduced rigidity, or slight card bowing can interfere with robotic pickup and placement. If a DBS card fails to sit flat or maintain uniform dimensions, automated equipment may misalign the card during punching or plate loading. In high-throughput laboratories processing thousands of DBS tests each day, these small deviations can quickly accumulate and increase operational error rates. Consequently, standardized DBS card geometry is critical for ensuring robotic systems can move samples consistently through automated workflows.
Beyond card geometry, the physical structure of the filter paper substrate plays a vital role in DBS integration. Properties such as paper density and pore structure influence how blood spreads across the collection surface, affecting spot size, absorption patterns, and the uniformity of the resulting dried sample. In workflows that rely on fixed-diameter punches, like newborn screening, therapeutic drug monitoring, and pharmacokinetic testing, consistent spot morphology becomes extremely important because variations in hematocrit levels can alter blood spreading behavior, which in turn affects analyte concentration within the punched sample. A uniform DBS substrate helps minimize spreading differences, support more consistent analyte recovery, and improve reproducibility across large DBS test batches.
Physical compatibility represents only one aspect of DBS integration. Laboratories must also determine how DBS samples move through the analytical pipeline, from card punching and extraction to instrumental analysis. Workflow configuration directly influences sample tracking, processing efficiency, and overall system reliability. Two primary extraction architectures are commonly used in high-throughput DBS laboratories for analyte extraction within DBS punch workflows prior to instrumental analysis: online extraction and offline extraction.
In online DBS workflows, extraction occurs directly within the analytical system. A DBS spot is secured inside an extraction module, where solvent passes across the filter paper and transfers analytes directly into the LC-MS/MS system. This configuration reduces solvent use and limits manual handling. However, be mindful that samples are processed sequentially, meaning each extraction must finish before the next begins. Such sequential processing can constrain overall throughput for very high-volume laboratories.
Offline DBS workflows separate extraction from the LC-MS/MS system. After punching, DBS discs are transferred to microplates where solvent extraction occurs prior to instrumental analysis. Because multiple DBS punches can be extracted simultaneously, offline extraction supports high batch throughput and allows laboratories to prepare extracts in advance of LC-MS/MS analysis.
Every DBS card typically carries a unique barcode that links the physical sample to a corresponding record in the laboratory information management system (LIMS). During automated punching, the DBS puncher scans the card barcode and assigns the DBS punch to a specific well position in the destination plate. This automated mapping maintains chain-of-custody documentation for each sample while reducing the risk of manual data entry errors.
Throughput ultimately determines whether DBS integration can support large-scale laboratory operations. To sustain high testing volumes, automated workflows must maintain steady sample movement through both pre-analytical and analytical stages of the DBS testing workflow.
Laboratories often assess DBS workflow performance using samples processed per hour. Automated DBS punchers typically process a card within 15-40 seconds, supplying a continuous stream of samples to the analytical workflow. However, in high-throughput DBS workflows, LC-MS/MS analysis often determines the overall throughput limit. LC-MS/MS systems may require several minutes to analyze a single DBS sample due to chromatographic run time and detector processing requirements. When analytical runtime exceeds punching speed, the LC-MS/MS system effectively becomes the primary workflow bottleneck.
A number of DBS cards include multiple collection spots obtained from the patient sample. This design supports reflex testing, allowing laboratories to confirm or expand an initial result without requesting a new specimen. Instead of retrieving stored samples, an additional spot can be punched from the same card for further analysis. Multi-spot DBS cards can reduce workflow interruptions and help laboratories sustain faster turnaround times during repeat testing.
Successful DBS integration into high-throughput lab workflows requires careful alignment between substrate design, automated handling systems, and analytical throughput. When DBS cards provide consistent geometry and reliable spot formation, laboratories can scale DBS testing without introducing mechanical or analytical variability. For organizations expanding their microsampling capabilities, RDA Spot offers DBS cards and sampling kits engineered specifically for automated laboratory environments. Reach out to our specialists to discuss how RDA Spot DBS cards can support automated DBS handling and high-throughput laboratory testing.