Merkez Prime Hospital in Gebze offers multidisciplinary care across 60 medical departments. It has a handy helipad for urgent patient transfers, making access easier from Australia. Diagnostics start with a paediatric check-up priced around A$600 to A$1,000. While the hospital doesn't currently provide specific treatments for atrial septal defect, its broad medical expertise means comprehensive evaluation is available before deciding on next steps.