Heyy mama! Saya tak sure the exact clinics kat Hulu Selangor, but most private hospitals and scan centers kena appointment dulu, I'd suggest call Klinik Kesihatan or ask your gynae for recommendation dekat area tu, they usually know best mana yang reliable for detailed scans. Rates vary la depending on clinic, boleh between RM300-600 jugak, so best tanya directly. A few of my mum friends kata GDM mums kena more frequent monitoring, so make sure you're booking with a place yang experienced with GDM patients ye!