Any antigen test that is Health Canada approved has to be overseen by a Health Canada approved health professional as well (they need to watch you do it live and see the result in real time). So if it were me I would first ensure I can get an appointment with one (LifeCenters an example of that, but they are fully booked for appointments, for example, for our time period). So if it were me, I would first find a provider that is approved and then I would ensure that the healthcare service confirms that they will use/approve your specific tests. In our case, we are using the Switch Health video testing service, so we purchased the tests directly from them to ensure that there are no last minute surprises. It's confusing enough as it is, so we just went with this more direct route and are using the others as backups.