Laboratory Contact

We undertake important tests for Ontario’s public health units, clinicians in primary care, hospitals, and long-term care facilities, as well as conducting reference testing for partner laboratories across the province. Clinicians and Public Health Units can contact Customer Service Centre for help with:

urgent request for test results; laboratory results are accessible through ONE Health or OLIS 24/7. Refer to Test Information Index for test turnaround times
clarifying specimen collection procedures; refer to Test Information Index
applying for autofaxing
access to medical and scientific experts for advice on test requests and results interpretation
clarifying testing acceptance criteria
updating your contact information
STAT and Critical specimen testing

Public Health Ontario also undertakes testing for private drinking water system owners (e.g., well water, treated lake water, water from cisterns). Private drinking water test results are available by phone, in person or by mail.

Laboratory Business Hours

Monday to Friday, 8:30 a.m. to 4:30 p.m. EST
Closed weekends and statutory holidays

Some laboratory locations are open for public well water specimen drop-off during business hours. Please refer to the Laboratory Locations below for the closest PHO laboratory drop-off locations. We have everything you need to know about sample collection and submission on our website.

These hours are subject to change around statutory holidays. Please refer to notices on our webpages for specific holiday hours.

PHO’s laboratory conducts testing seven days a week. Refer to the individual Test Information sheet for assay specific testing schedule, frequency and/or turn-around times.

Laboratory Customer Service

Monday to Friday, 7:30 a.m. to 7 p.m. EST;
Saturday, 8 a.m. to 3:45 p.m. EST
Tel: 416-235-6556
Toll Free: 1-877-604-4567
Fax: 416-235-6552
Email: Customerservicecentre@oahpp.ca

After Hours Emergencies

For public health units, clinicians in primary care, hospitals, long-term care facilities, and partner laboratories, contact our After Hours Duty Officer at 416-605-3113.