Sonic Healthcare USA, also known as SHUSA, is a chain of independent regional medical laboratories. It provides a range of laboratory testing services for physicians, medical practitioners, hospitals and community health services facilities. The chain operates more than five laboratories in the United States. Established in 2007, Sonic Healthcare USA is a part of Sonic Healthcare, which is one of the largest medical diagnostics companies in the world. It offers laboratory medicine, pathology and radiology services. The company employs over 20,000 people in the United States, United Kingdom, Australia, New Zealand, Germany and Switzerland. Sonic Healthcare specializes in hematology and transfusion serology, immunology, microbiology, biochemistry and endocrinology, histopathology and cytology.