Shiel Medical Laboratory... committed to excellence in the field of medical diagnostics. Shiel is one of the country's oldest, continuously operating clinical laboratories, and New York City's largest privately held lab. As a result of our commitment the medical community has taken notice, resulting in dramatic growth over the last few years. We service Private Physicians, Group Practices, Union and Industrial accounts, Long-Term Care Facilities, and Home Care agencies in the Five Boroughs of NYC, Nassau, Suffolk, Westchester,Rockland and Orange Counties, New Jersey and Pennsylvania. Additionally, we accept samples for our exclusive Oxidized LDL tests, from clients and researchers, nationwide. We will expand geographically as we continue to grow.