Upfront medical exam before getting ITA in Express Entry

Is upfront medical exam possible before we get an ITA for express entry? I called the panel physician and they say they can do it without ITA but want to confirm if it is OK? We are expecting ITA in the next draw whenever that happens in next few months…

https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/express-entry/documents/medical-exams.html