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22 Cards in this Set

  • Front
  • Back
When should you see a GS consistently?
By TV at 5 wks, 1-2mm.
What is the echogenic rim around the GS called?
Trophoblastic reaction.
What is the accuracy of the mean sac diameter?
+/- 7days.
What is the formula for mean sac diameter?
L + H + W /3
How do you measure the MSD?
Inner to inner.
A GS in the lower uterine segment has what?
A poor prognosis.
What should the wall of the GS measure?
3mm or more. (<2 mm has a poor prognosis).
How much does the GS grow per day?
1mm.
What is the earliest recognizable landmark after the GS?
The YS. Should measure 6mm.
When should you see the YS?
By 5wks, until @ 10 wks.
What does the YS do?
It provides nourishment to the developing fetus. It's the 1st site of hematopoiesis, and the initial site of the production of alpha feto protein.
Where is the YS located?
Between the amnion and chorion, in the chorionic cavity.
When should the fetal pole be recognized?
Consitantly when it measures 4mm/ 5-6 menstrual wks.
What is the accuracy of measuring the fetal pole?
+/- 4-6d.
When can you first see cardiac activity?
As soon as the fetal pole is visualized. It should always be present in a fetal pole measuring 5mm or more.
What is a normal heart rate from 5-6wks?
100-120.
What is a normal heart rate from 8-9wks?
140-170.
What is considered an acceptable heart rate after 9wks?
120-160.
When is the rhombencephalon visualized by?
8-11wks.
When do you measure for NT?
With a CRL of 4.5-8.4cm.
When does the corpus luteum of pregnancy regress?
Starting @10wks and should be completely resolved by 16wks.
When can you detect hCG?
By 3 menstrual wks, and it begins to level off at @ 8wks then declines.