1st Tri Flashcards
Gestational age:
conceptual + 2 wks
What’s the first sonographic sign of an intrauterine pregnancy?
gestational sac (4.5wks)
What is the double decidual sac sign made up of?
chorion + decidua capsularis
These MSD measurements should be made at the:
interface between the echogenic border and fluid
Normal first trimester GS growth rate should be:
1mm/day
An intrauterine pregnancy should be seen TV with a serum beta hCG level greater than
1000-2000mIU/mL
What are causes of a high AFP level?
underestimated gestational age multiple gestations open NTD abdo wall defect cystic hygroma renal anomalies fetal demise
What are causes of a low AFP level?
overestimated gestational age chromosomal abnormalities trophoblastic disease long-standing fetal demise chronic maternal hypertension diabetes
With TVS we should see the GS
<8mm at around 5-5.5wks
The yolk sac and embryo can be seen separated by the ______ but connected by the __________ _______
amnion, vitelline duct
The yolk sac measures ______ to ______ in the first trimester
2-6mm (inner borders)
The embryo grows at a rate of _______ .
1mm/day
When is the embryonic period?
wk 6-10
When can we see cardiac activity?
5-5.5 wks or when the CRL=5mm
With a TA technique, we should see the embryo at what measurement?
25mm
