Harmony Test

Hi mummies, may I know if anyone been through harmony test? I done my oscar scan on last Saturday and my gynae called me this afternoon and told me that I'm at the high risk. My gynae want me to go down to discuss about harmony test. I'm coming 35y and this is my 3rd bb. I'm very worried and lost now. May I know if anyone been through this and how much its cost for harmony test? Thanks.