ELMWOOD PARK, N.J.--(BUSINESS WIRE)--Bio-Reference Laboratories, Inc. (NASDAQ: BRLI) announced today that it has entered into a purchasing agreement with a McKesson Specialty Health group purchasing organization (GPO), the Onmark GPO. The Onmark GPO delivers a range of services to its members that now include a contract for the routine and specialized services of the Bio-Reference family of clinical diagnostic services. Onmark GPO is one of the solutions delivered to community-based practices through the Onmark Select Program. Onmark Select delivers a broad set of proven, customizable solutions that includes GPO services as well as differentiated technology, revenue cycle and payer solutions, clinical tools, business resources and clinical trial support.