Normal Pregnancy Weeks Flashcards
Gestational sac
5.0 Weeks
Yolk sac
5.5 Weeks
Embryo with heartbeat
6.0 Weeks
Amnion
7.0 Weeks
Yolk sac disappears
12 weeks
Embryonic cardiac activity
6.0 Weeks
Fusion of amnion and chorion
14 to 16 weeks
Cystic appearance of rhombencephalon
6 to 8 weeks
Mid gut herniation into the base of the umbilicus forming a physiologic omphalocele
Seen as a protruding midline anterior abdominal wall mass 6 to 9 mm in size
9 to 11 weeks
CRL is useful until about what weeks of GA?
When other fetal measurements become more accurate
12 weeks
Regression of corpus luteal cyst
16 to 18 weeks
Placenta - visualized as early as how many weeks?
8 weeks - focal thickening at the periphery of the GS
12 weeks - disc like shape
18 weeks = finely granular and homogeneous
Chorionicity is best determined in what week?
Between 11 and 15 weeks
or 11-15 weeks
When is detailed fetal anatomic US survey performed?
18 to 22 weeks
First trimester is performed when?
Between 11 and 14 weeks