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Abstract INTRODUCTION:
Clinical mass spectrometry laboratories must balance increasing demands for high-throughput, accurate testing while maintaining stringent quality standards. At our academic medical center, implementing liquid chromatography-tandem mass spectrometry (LC-MS/MS) for toxicology confirmatory testing required a strategic approach to workflow optimization due to staffing constraints. Our laboratory was designed to maximize efficiency and scalability from inception, incorporating integrated automation and IT solutions to support the processing of approximately 3,000 patient samples per month with only two dedicated full-time equivalents (FTEs). By leveraging force multipliers, we have maintained a lean staffing model while expanding high-quality toxicology testing capabilities, mitigating the impact of staffing variability and shortages affecting other laboratory sections.
METHODS:
To enhance operational efficiency, we developed a dynamic, real-time tracking system within the laboratory information system (LIS) to minimize time spent searching for specimens and prevent overlooked samples. A liquid handling system was implemented with custom urine collection cups, enabling direct sampling and nearly eliminating the need for specimen transfer into secondary containers. It processes the calibrators, controls, and patient samples in a 96-well plate format, incorporating enzymatic hydrolysis, protein precipitation, and sample dilution steps. The liquid handler’s barcode reader enables the generation of an electronic plate map that ensures positive sample identification and allows for direct upload into the LC-MS/MS run list, reducing manual data entry time and errors. Semi-automated data processing, guided by algorithmic quality rules, streamlines initial data review by flagging potential issues and enabling a review-by-exception workflow. Additionally, custom pathologist review software systematically tracks and manages the review of results escalated for secondary evaluation, ensuring timely, consistent decision-making and comprehensive documentation. Interfacing the middleware to the LIS allows for result transfer for an entire plate within minutes.
RESULTS:
The integration of automation and IT-driven solutions has maximized laboratory efficiency. The pending test list management system enables all samples for a run to be identified and prepared for loading onto the liquid handler within 30 minutes. The total processing time for a full 96-well plate on the liquid handler is 2.5 hours, with only 20 minutes of hands-on technologist time required. While the liquid handler does not reduce overall plating and processing time, it enhances consistency across staff, improves patient safety, and allows technologists to multitask during 90% of the process. Additionally, automated plate mapping streamlines the creation of the LC-MS/MS analytical run list, reducing manual entry time to just 5 minutes.
Semi-automated data processing has significantly decreased review time, with an average of only 2.5% of results requiring manual verification. This has reduced technologist review time per plate from approximately 4 hours to just 45 minutes. Given that each full plate contains 96 samples, amounting to 9,792 chromatograms requiring analysis, this reduction in workload has alleviated the burden on laboratory personnel while maintaining accuracy. The electronic transfer of results from the middleware into the LIS via an interface eliminates the need for manual data entry, reducing a task that could take hours of technologist time to less than 5 minutes. Collectively, these workflow advancements have maximized reproducibility, optimized turnaround time, and reinforced high-quality patient care.
CONCLUSION:
Strategic integration of automation and IT-driven solutions allows clinical mass spectrometry laboratories to enhance efficiency while maintaining accuracy and patient safety. Key workflow optimizations—including automated pending test list tracking, semi-automated data processing, and structured review systems—are essential for sustaining high-volume LC-MS/MS testing within large healthcare networks. Our laboratory processes over 3,000 samples monthly with a median turnaround time of four days, operating Monday through Friday during first shift, with only two dedicated bench technologists. Within the laboratory, error rates remain below 0.01% across all analytical phases, supported by a synergistic framework that strategically integrates automation, IT solutions, and human expertise. Continued investment in these innovations will be essential for laboratories to meet increasing demand while maintaining high-quality diagnostic services.
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= Discovery stage. (53.14%, 2025)
= Translation stage. (22.33%, 2025)
= Clinically available. (24.53%, 2025)
