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The Doctors Laboratory (TDL) is a medically-led laboratory established in 1987 and the largest independent provider of clinical laboratory diagnostic services in the UK. We provide our customers with the laboratory information required for diagnosis and treatment of medical disorders. TDL's CPA accredited laboratory is based in central London, providing pathology services for clinical practice throughout the UK, Eire and other international markets. TDL's parent company, Sonic Healthcare Ltd, is an Australian clinical diagnostic organisation, and is the third largest provider of pathology services worldwide. TDL's commitment is to the doctors who request pathology services from us, their patients, our staff and their technical and operational excellence.