thank you so much..Usually means that your chest x-ray wasn’t clear. Could be a result of anything from your past but in certain regions they want to rule out TB. Further tests doesn’t mean automatic approval but you didn’t get automatic refusal which you get soon after applying.
Would warn you that if your plan is to try to immigrate to Canada if you do get the study permit you may run into issues with medical inadmissibility when applying for PR. Your kidney transplant will be closer to the 15 yr mark which means you may start having more expensive problems and eventually need a new transplant. Nobody can predict the future but certainly something to consider.