Subsidised to Private

I am currently under subsidised route with NUH. And have decided to go to private gynae and deliver at a private hospital (MEHN). I met my private gynae at 24 week and she kindly allowed me to have my glucose test with NUH at week 26 as scheduled earlier and report back to her with the results at week 30. My question is, if i want to stop entirely attending NUH appts, do i have to tell someone frm NUH or just start ignoring their upcoming appointments? Or do I need to officially inform NUH and make them transfer my docs to my pvt gynae in MEHN? P/S: So far i am able to produce docs / whatever results i have frm NUH to my pvt gynae, they are already in NUH app or docs alr in my hands.