(25 Tests) Rapid Diagnostic Test Kit Sofia® Strep A+ FIA Fluorescence Immunoassay (FIA) Strep A Test Throat Swab Sample CLIA Waived. The Sofia Strep A+ Fluorescent Immunoassay (FIA) uses advanced immunofluorescence-based lateral-flow technology to detect Group A Streptococcal antigens from throat swabs. Ground shipping only available. If you need expedited shipping please contact us at 1.888.882.7739. $2 Additional Shipping due to oversized item. Note: THIS ASSAY REQUIRES PRE-PURCHASE OF A SOFIA ANALYZER - ALL SALES FINAL NO RETURNS OR EXCHANGES.