Hello,https://www.canada.ca/en/immigration-refugees-citizenship/services/application/medical-police/medical-exams/requirements-permanent-residents.html
As per this^ you can do it upfront apparently.
Again, your best bet would be to simply call the clinic and check with them.
Please I need some clarifications on filling form IMM0008, the very first question "Program under which you are applying", has only four options to select from viz; Family, Refugee, Economic and Other. I'm an express entry applicant, was only trying to add my baby to my application that's why I was asked to fill the form. Which of the aforementioned options do you think is best for me to select? Thanks!
Regards