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Practice Guidelines

qap_symbol_and_noticePractice guidelines are intended to provide guidance for Ontario's medical laboratory technologists (MLTs) in their professional practice. 

These guidelines:

  • Are intended to support, not replace, the exercise of professional judgment by MLTs.
  • Are developed by working groups, which may be composed of registrants of the College of Medical Laboratory Technologists of Ontario (CMLTO) or other stakeholders, to ensure they accurately represent best practices and current information.
  • Reflect both public and professional interests.
  • Are maintained by the various CMLTO committees.
Guideline for Evaluating Professional Practice Activities : January 2022

On August 14, 2020, the CMLTO Quality Assurance Committee passed a motion to rescind the Guidelines for Medical Laboratory Technologists Practising in Transfusion Science. The guidelines are no longer available.

If you require any further information or confidential practice advice, please contact the Quality Assurance Program at This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

CMLTO held a webinar on February 22, 2018, to address MLTs' questions about why the CMLTO Cytology & Histology Practice Guidelines were rescinded, and how it affects their professional practice. Topics included:
• Overview of MLT Standards of Practice, Code of Ethics, Scope of Practice and professional obligations
• CMLTO Practice Guideline development and review process.
A recorded version of the webinar can be accessed by clicking here. Please note that to view the webinar, you will be required to provide your name and email address.
An FAQ (PDF) was created as an outcome of the webinar, and can be accessed by clicking here.

Practice Guidelines