Class III in vitro diagnostic medical devices (IVDs) Medical Device License (MDL) registration in Canada is a regulatory process that ensures these devices meet Health Canada’s standards for safety, effectiveness, and quality before they are marketed in the Canadian market. Class III IVDs are considered moderate- to high-risk devices, often used in critical diagnostic areas where accurate results are essential for patient health decisions. Because of this, they undergo a more detailed review compared to lower-risk classes.