Labcorp to serve as the exclusive NOWDiagnostics (NOWDx) distributor for clinical testing in the U.S., offering First to Know® Syphilis Test nationwide BURLINGTON, N.C., Oct 10, 2024 /PRNewswire/ -- Labcorp (NYSE: LH), a global leader of innovative and comprehensive laboratory services, announced today it has expanded its portfolio of sexually transmitted infection (STI) testing options to include the First to Know® Syphilis Test, the first over-the-counter blood test granted market authorization by the U.S ...