In Karachi,on monday,29-10-2018,Navy selection center gave us ISSB form and medical letter for PNS Shifa,Karachi and said that ISSB form should be submitted on or before 2nd November and start your medical process and completed as early as possible.
While, when we have submitted ISSB form ,they said that shortlisting of final interview will be made on your personality test and ISSB submitted form.

Medical is not important for final interview shortlisting at this stage.If you receive call for final interview and your medical process inprogress .So,there is no problem .you can appear in the interview (Said Karachi recruitment and Selection Center)