BURLINGTON, N.C.--(BUSINESS WIRE)--Laboratory Corporation of America® Holdings (LabCorp®) (NYSE: LH) announced today that it is the first national laboratory to offer customers a 21-marker genetic analysis in combination with a double-blind process for parentage/relationship testing on every sample. The testing utilizes two kits developed for LabCorp by Promega Corporation of Madison, Wisconsin. The kits consist of 20 autosomal genetic markers and one gender marker. The kits have overlapping genetic systems that, when coupled with independent DNA extractions, yield a double blind test for every sample.