1st Trimester
The most accurate measurement for dating purposes
Crown Rump Length (CRL)
What are the gestational weeks that comprise the 2nd trimester?
13-26
This is when the placenta completely covers the internal os
placenta previa
Sonographically you visualize hypoechoic/anechoic areas within the placental substance. These are normal and are termed:
venous lakes
The chamber of the heart located closest to the spine:
left atrium
What connects the embryo to the yolk sac?
Vitelline duct
What is the very first thing you should check before beginning any OB exam?
Confirm fetal heart rate
This is when the edge of the placenta is within 2cm of the internal os
low lying placenta
The cervix should measure at least:
3cm
This occurs when there is a uterine pregnancy and an ectopic pregnancy at the same time.
heterotopic pregnancy
This structure secretes progesterone to help maintain the pregnancy.
Corpus luteum
What are the four basic measurements needed to obtain an estimated fetal weight?
BPD, HC, AC, and FL
What grade is the placenta if the chorionic plate is smooth and the placental substance is homogeneous throughout:
Grade 0
This is an exam performed to check on fetal well-being
Biophysical profile
Excessive vomiting that occurs due to excessive amounts of hCG
hyperemesis gravidarum
The area where the placenta is developing is called what?
decidual reaction
thalamus
What grade would the placenta be if you visualized obvious indentations in the chorionic plate that extend as far as the basal layer, with many scattered calcifications as well as anechoic areas throughout:
A baby is termed to have intrauterine growth restriction (IUGR) if the estimated fetal weight drops below this percentile:
10th percentile
This is a crescent shaped hypoechoic area seen adjacent to the gestational sac during the first trimester
What is the most common form of gestational trophoblastic disease?
hydatidiform mole
This structure provides communication between the right and left hemispheres of the brain:
corpus callosum
This type of placenta has edges that curl up and away from the uterine wall:
Circumvallate placenta
This type of test is done to determine if the placenta is functioning as it should:
Umbilical cord Doppler (S/D ratio)
The opening within the atrial septum:
foramen ovale