Normal Pregnancy Weeks

Question 1

Gestational sac

Answer 1

5.0 Weeks

Question 2

Yolk sac

Answer 2

5.5 Weeks

Question 3

Embryo with heartbeat

Answer 3

6.0 Weeks

Question 4

Amnion

Answer 4

7.0 Weeks

Question 5

Yolk sac disappears

Answer 5

12 weeks

Question 6

Embryonic cardiac activity

Answer 6

6.0 Weeks

Question 7

Fusion of amnion and chorion

Answer 7

14 to 16 weeks

Question 8

Cystic appearance of rhombencephalon

Answer 8

6 to 8 weeks

Question 9

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

Answer 9

9 to 11 weeks

Question 10

CRL is useful until about what weeks of GA?

When other fetal measurements become more accurate

Answer 10

12 weeks

Question 11

Regression of corpus luteal cyst

Answer 11

16 to 18 weeks

Question 12

Placenta - visualized as early as how many weeks?

Answer 12

8 weeks - focal thickening at the periphery of the GS

12 weeks - disc like shape
18 weeks = finely granular and homogeneous

Question 13

Chorionicity is best determined in what week?

Answer 13

Between 11 and 15 weeks

or 11-15 weeks

Question 14

When is detailed fetal anatomic US survey performed?

Answer 14

18 to 22 weeks

Question 15

First trimester is performed when?

Answer 15

Between 11 and 14 weeks

Question 16

Nuchal translucency is performed when?

Answer 16

Between 11 and 14 weeks

Question 17

The thickness measurement of the nuchal cord is considered reliable only between what week?

Answer 17

Between 15 and 20 weeks GA

When normal skin thickness is relatively constant

Question 18

Swallowing begins at what week?

Answer 18

11 to 12 weeks

Question 19

Fluid filled stomach is seen at what week?

Answer 19

18 weeks