Nuchal Translucency Scan sis. Ginagawa yan late first trimester. Nicheck if me markers ng down’s syndrome at ibang pa genetic abnormality. Meron sila sinusukat to know if high ang chances. CAS around 24-28 weeks nakikita kung meron defect si baby. From head to toe assessment yan.
usually 20weeks manonotice yun thru CAS, 13weeks is nagdedevelop palang din sila. Unless mahina ang heartbeat ng baby mo sa 13weeks