CAS/3D ULTRASOUND

Hi mommies tanong ko lang ano po kayang pinagkaiba ng CAS at 3d/4d ultrasound? At usually ilang months po sya pwede gawin? I'm 18weeks preggy po and first time mum. Trans vaginal ultrasound pa lang po ang nagagawa ko at laboratories other than that wala na po. Feb 18 pa ulit balik ko kay ob. Magrequest na kaya sya for ultrasound? Salamat po ?

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Ung cas mamsh is para makita kung my anomaly kay baby..  congenital anomaly scan(CAS), sometimes called congenital anatomy scan or 20-week scan, is done in the second trimester, between 18 to 22 weeks.