This project aimed to evaluate the implementation of dried blood spot (DBS) sampling at pilot sites across the province to learn what worked well, what was challenging, and whether DBS sampling should be scaled up.
DBS are a novel sampling approach for STBBIs in B.C., extending access for diagnosis and monitoring of infectious diseases. The method involves collecting small samples of blood through a finger prick, which are absorbed onto special filter paper. After DBS samples are processed in the laboratory, testing is run on the same molecular and serology instruments as phlebotomy samples. BC samples are currently being sent to Winnipeg for STBBI testing at the National Microbiology Laboratory.
Since 2021, B.C. has been supporting a DBS sampling pilot for sexually transmitted and blood borne infections (STBBIs) supporting testing for HIV, hepatitis C, and syphilis. The DBS pilot evaluation built on key public health innovations emerging during the COVID-19 pandemic and sought to address challenges of inequitable access to STBBI testing, particularly in small urban, rural, and remote communities.
In parallel, the BCCDC Public Health Laboratory worked to validate DBS as a sample type for STBBI tests so testing could be performed locally in B.C. instead of sending samples to the National Microbiology Laboratory (NML). The laboratory validation has been completed for HIV antibody/antigen and RNA (screening and diagnosis); hepatitis C antibody and RNA (screening and diagnosis); syphilis antibody (screening only); and hepatitis B antigen (active infection diagnosis only).
Evaluation results suggest DBS can reach populations at higher risk for HIV, hepatitis C, and syphilis in less urban areas with a high-level of satisfaction. The evaluation of this pilot provides learnings on how to improve DBS sampling in B.C.