Clinical laboratory services: Greater Toronto

There are multiple clinical laboratories across the Greater Toronto Area (GTA) in Ontario, Canada.

Below are listed the main hospital-based clinical laboratories in the GTA.

Michael Garron Hospital, Toronto

The Laboratory

Laboratory website

Michael Garron’s medical laboratory provides an extensive range of diagnostic laboratory testing for hospital inpatients and outpatients.


  • Chemistry
  • Hematology
  • Pathology
  • Immunohematology
  • Microbiology (shared hospital lab)

Mount Sinai Hospital, Toronto

Department of Pathology and Laboratory Medicine (PLM)

Pathology and Laboratory Medicine (PLM) website

PLM at Mount Sinai Hospital is a leader in patient laboratory services in Canada. Our laboratories provide support to many hospitals, medical clinics and health-care professionals in the Greater Toronto Area, across Canada and the world. PLM performs a wide range of services including blood tests and specialized tissue analysis. 

Service areas include: 

Pathology Services 

  • Consultation Service 
  • Surgical pathology 
  • Cytopathology 
  • Autopsy 
  • Advance Bioimaging Centre 
  • Rubinoff Bone and Tissue Bank  

Diagnostic Medical Genetics 

  • Cytogenetics 
  • Molecular Genetics 
  • Predictive Genetic Testing 

Laboratory Services 

  • Andrology 
  • Biochemistry 
  • Hematology 
  • Microbiology (see below) 
  • Transfusion Medicine 

Mount Sinai Services 

Mount Sinai Services website

Mount Sinai Services laboratory services catalogue (PDF)

A flexible provider of translational research and related services to clients in Toronto or around the globe. MSS supports biopharmaceutical and biotechnology companies, medical device/diagnostic companies, researchers, and external clinics. They offer unique “bench-to-bedside” integrated services for clinical trials as well as diagnostic and biomarker development.

North York General Hospital, Toronto

The Department of Laboratory Medicine

Laboratory Medicine website

The Department of Laboratory Medicine at North York General Hospital conducts lab tests efficiently and quickly to assist physicians in diagnosing patients' conditions. The full-service laboratory at the General site provides approximately 1.6 million tests annually.

North York General's outpatient laboratory is no longer accepting requisitions from community physicians.


  • Clinical Pathology
  • Clinical Chemistry
  • Hematology and Coagulation
  • Transfusion Medicine
  • Microbiology
  • Anatomic Pathology
  • Histopathology
  • Cytopathology

St. Michael’s, Unity Health, Toronto

The Department of Laboratory Medicine

Diagnostic Laboratories website

Laboratory test catalogue

The full-service diagnostic laboratories at St. Michael’s reference work from over 48 other institutions. The Department of Laboratory Medicine is comprised of 19 highly qualified pathologists and laboratory physicians, and 8 PhD scientists, many of whom are internationally renowned.


  • Biochemistry
  • Hematology
  • Molecular Diagnostic and Cytogenetics
  • Transfusion Medicine
  • Specimen Management

Sunnybrook Health Sciences Centre, Toronto

Laboratory Medicine and Molecular Diagnostics

Laboratory Medicine and Molecular Diagnostics website

Lab test information guide

Divisions / Service areas:

  • Anatomic Pathology
  • Clinical Pathology – Clinical Chemistry and Hematological Pathology
  • Clinical Pathology – Transfusion Services and Tissue Bank
  • Laboratory Information Systems
  • Microbiology
  • Molecular Diagnostics
  • Point of Care Testing

The Hospital for Sick Children, Toronto (SickKids)

Department of Paediatric Laboratory Medicine

Department of Paediatric Laboratory Medicine website

Lab and testing services

The Department of Paediatric Laboratory Medicine (DPLM) generates original research and provides timely, specialized diagnostic services for health-care providers in Canada and around the world.


  • Clinical Biochemistry
  • Genome Diagnostics
  • Haematopathology
  • Microbiology
  • Pathology

Trillium Health Partners, Mississauga

The Department of Laboratory Medicine

Testing website

Clinical Genetics website

The Department of Laboratory Medicine at the Credit Valley Hospital serves both inpatients and outpatients, performing over 3 million tests annually. The state-of-the-art laboratory provides all services to assist the physician in diagnosing patients.

Credit Valley Hospital’s outpatient laboratory is no longer accepting requisitions from community physicians.


  • Transfusion Medicine
  • Haematology
  • Histology/Cytology
  • Microbiology
  • Clinical Chemistry
  • Genetics

University Health Network/Sinai Health

Department of Microbiology

Microbiology Laboratory Services website

The Laboratory Manual (contains test catalogue)

The Department of Microbiology is a collaborative laboratory operation between Sinai Health Systems and the University Health Network. They are recognized as a center of excellence and are a prime reference center for both hospital and private sector laboratories. They offer state-of-the-art diagnostics, methods development, research, and education.

Service areas (see the Laboratory Manual for a full list):

  • Bacteriology
  • Antimicrobial Resistant Organisms
  • Sterility Testing
  • Living and Cadaveric Donor Testing
  • Virology
  • Molecular Diagnostics
  • Serology
  • Mycology

University Health Network (UHN), Toronto

Laboratory Medicine Program (LMP)

Laboratory Medicine Program website

Laboratory medicine tests and labs listings

Reference tests and services

​​​The University Health Network's Laboratory Medicine Program impacts nearly every patient that goes through Toronto General, Toronto Western, Toronto Rehab, and Princess Margaret Hospitals. They are the largest hospital-based diagnostic laboratory in Canada and one of the largest academic laboratories in the world.


  • Anatomical Pathology
  • Clinical Biochemistry
  • Clinical Laboratory Genetics​
  • Hematology and Transfusion Medicine​
  • Clinical Microbiology (see above)

William Osler Health System, Toronto

The Laboratories

Laboratory website

Service areas:

  • Anatomical and Surgical Pathology
  • Clinical Chemistry
  • Cytology
  • Flow Cytometry
  • Hematology
  • Microbiology
  • Point of Care Testing
  • Transfusion Medicine – performing blood typing and compatibility testing