Using dried blood spot samples (DBS) is an accurate alternative to venous blood in detecting SARS-CoV-2 antibody tests, a new study by immunology experts at the University of Birmingham has found.<\/p>\n\n\n\n
Currently antibody testing for COVID-19 uses serum or plasma, which requires a full intravenous blood sample, collected by a trained phlebotomist. For population-wide or high volume testing, the use of such sampling is limited by logistic challenges, resources, and costs, as well as the risk of SARS-CoV-2 exposure from direct patient contact. In contrast, DBS sampling is simple, inexpensive and can be self-collected by the patient at home, using a simple finger prick. The sample can then be collected on a forensic grade card before being posted back to labs for processing. This offers exciting possibilities to widen access to antibody testing particularly in more resource limited countries.<\/p>\n\n\n\n
Researchers analysed serum and DBS samples from volunteers at University Hospitals Birmingham Foundation NHS Trust, some of whom had previously tested positive for SARS-CoV-2 by molecular tests, while the status of other volunteers was either negative or unknown. The anonymised matched serum and DBS samples were then processed using a highly sensitive ELISA test, developed by the University’s Clinical Immunology Service in partnership with The Binding Site, which specifically detects antibodies (IgG, IgA and IgM) to the SARS-CoV-2 trimeric spike protein.<\/p>\n\n\n\n
Results showed a significant correlation between matched DBS and serum samples and minimal differences in results observed by sample type, with negligible discordance. Relative to serum samples, DBS samples achieved 98% sensitivity and 100% specificity for detecting anti-SARS-CoV-2 S glycoprotein antibodies. 100% of the PCR-positive samples were also antibody-positive in DBS.<\/p>\n\n\n\n
Senior author Dr Matthew O’Shea from the University’s Institute of Immunology and Immunotherapy said: “Our results have demonstrated that dry blood spot sampling not only offers a viable alternative for antibodies testing, but one that overcomes the limitations that current methods can present by eliminating the need for skilled phlebotomists.<\/p>\n\n\n\n
“DBS offers the opportunity for wider population-level testing and improved surveillance in vulnerable groups such as patients with chronic conditions, the immunocompromised and the elderly by removing the need to come into contact with a healthcare professional during sample collection.”<\/p>\n\n\n\n
Co-author Professor Adam Cunningham from the Institute of Immunology and Immunotherapy said: “As well as offering the opportunity for improved population-wide antibody testing in the UK, the simplicity and cost-effectiveness of the dry blood spot method could improve the effectiveness of sampling in low and middle-income countries, among groups where venepuncture is culturally unacceptable or in geographically dispersed populations.”<\/p>\n","protected":false},"excerpt":{"rendered":"
University of Birmingham Using dried blood spot samples (DBS) is an accurate alternative to venous blood in detecting SARS-CoV-2 antibody tests, a new study by immunology experts at the University of Birmingham has found. Currently antibody testing for COVID-19 uses serum or plasma, which requires a full intravenous blood sample, collected by a trained phlebotomist. […]<\/p>\n","protected":false},"author":1,"featured_media":2504,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[60,59,61],"class_list":["post-2519","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","tag-blood-spot","tag-covid-19","tag-sars-cov-2"],"_links":{"self":[{"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/posts\/2519","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/comments?post=2519"}],"version-history":[{"count":1,"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/posts\/2519\/revisions"}],"predecessor-version":[{"id":2520,"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/posts\/2519\/revisions\/2520"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/media\/2504"}],"wp:attachment":[{"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/media?parent=2519"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/categories?post=2519"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/scientificasia.org\/index.php\/wp-json\/wp\/v2\/tags?post=2519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}