ARDMS Obstetrics
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1. What is the first The nuchal translucency examination
trimester risk sono-
graphic examination
also called?
2. What does the nuchal 1. Measurement of the nuchal translucency
translucency examina- 2. CRL (Crown-Rump Length)
tion measure? 3. Visualization of the fetal nasal bone
3. What does the stan- 1. Gestational age by fetal biometry
dard obstetric sonog- 2. Fetal number
raphy examination 3. Placental position
evaluate? 4. Cardiac activity
5. AFI (Amniotic Fluid Index)
6. Fetal anatomic survey
4. Define gravidity The number of pregnancies
5. Define parity A numeric system that describes all possible pregnancies
6. What are the num- 1. Full term pregnancies
bers representing in 2. Premature births and stillborns
the parity numeric sys- 3. Miscarriages or termination
tem? 4. Living children
7. What is the standard LMP (Last Menstrual Period)
way to date a preg-
nancy?
8. Pregnancy is divid- 3
ed into how many
trimesters?
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9. How long is the first From beginning of the pregnancy to 13 weeks and 6 days.
trimester?
10. How long is the sec- From 14 weeks to 26 weeks and 6 days.
ond trimester?
11. How long is the third Begins at 27 weeks gestation until term.
trimester?
12. What is Nagele's rule? EDD (Estimated Due Date) = 3 months from LMP + 7 days
13. What fetal biometry is AC (Abdominal Circumference)
used in the estimate in
fetal weight?
14. What is conceptual Embryonic age
age also known as?
15. What is conceptual With conception as the first day of pregnancy
age?
16. What is gestational Considers the first day of the last menstrual period as the beginning of
age? gestation
17. What is gestational Menstrual age
age also known as?
18. What is the conceptus A zygote
called during the im-
plantation process?
19. What is the zy- An embryo
gote called from the
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implantation to 10
weeks?
20. What is the embryo A fetus
called after the 10
weeks?
21. What is the cell divi- 1.Rapid cellular division forms the 16-cell morula
sion process of a zy- 2.Further division brings the morula to the blastocyst stage
gote? 3.The blastocyst contains trophoblastic calls.
4.The trophoblastic cells begin to secrete hCG
22. True or False True
hCG levels plateau and Increased hCG levels can be used s a screening marker for Down syn-
decline while normal drome during the first and second trimester.
gestation continues.
23. What does the ane- Chorionic cavity
choic center is the first
trimester represent?
24. What does the Desidual reaction
echogenic rim sur-
rounding the chorion-
ic cavity represent in
the first trimester ul-
trasound?
25. What is the first struc- The secondary yolk sac
ture seen in the in-
tragestational sac?
26.
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What are the functions 1. Provision of nutrients to the embryo
of the secondary yolk 2. Hematopoiesis (the formation of blood or of blood cells)
sac? 3. Development of the embryonic endoderm
27. What should a talk sac 6mm
NOT exceed? *Enlarged yolk sacs may have threatening outcomes
28. True or False False
The number of yolk It is very consistent with the number amnion membranes
sacs are not consistent
with the number of
amnion membranes
29. When is the yolk sac 12 weeks
reabsorbed and never
seen again?
30. Define chorioamniotic Fusion of the membranes
fusion
31. When does chorioam- 14-15 weeks
niotic fusion occur?
32. What creates the yolk Narrowing between the embryo and the yolk sac
stalk?
33. The dorsal portion of -Foregut, midgut, and hindgut
the yolk sac is incorpo- -Entire gestational tract
rated into the embryo -Liver
and gives rise to what -Biliary tree
structures? -Pancreas
34.