OB/GYN ARDMS Registry Review Exam Questions and Answers | Latest Version | Guaranteed A+ | 2026

OB/GYN ARDMS Registry Review Exam Questions and Answers | Latest Version | Guaranteed A+ | 2026 Rhombencephalon - answer-The primitive hindbrain can be seen as a cystic structure with in the embryonic head? Decidua Basalis - answer-The maternal side of the developing placenta is referred to as the? 1 mm/day - answer-Up to 10 weeks gestational age, the mean diameter of the normal gestational sac should grow? 12 weeks CRL measures 45mm - answer-Physicologic hernation of fetal intestines outside the abdomen should not be seen after what gestational age? 7 mm - answer-The base of the umbilical cord should not exceed? 3600 units/liter 2000 units/liter - answer-One should be able to transabdominally image a gestational sac when the IRC level for hCG is = or ? Transvaginally? Hydatiform Mole - answer-Patient is 10 weeks by menstrual dates with pregnancy induced hypertension. You suspect?Preeclamsia - answer-Almost always pathonomonic of a molar pregnancy in the 1st trimester? Dilated cervix - answer-Pregnant patient presents with bledding and cramping. What would be suspect of an inevitable abortion? Heteroectopic pregnancy - answer-An ectopic with a normal IUP? Yolk Sac - answer-To differentiate an early IUP from a pseudogestational sac, it is helpful to visualize? 6mm Irregulary shaped Calcified - answer-A yolk sac is considered abnormal when it's diameter exceed? Shape? Appearance? Methotrexate - answer-What drug can be used to treat an early unruptured ectopic pregnancy in order to preserve fertility? Anteflexed - answer-The most common position of a uterus is? Interstitual Rupture is accompanied by bleeding from the uterin arteries - answer-In a ruptured extopic pregnancy, which section of the tube is most life threatening? Why? The amnion and yolk sac - answer-The double bleb sign refers to?8 weeks 10 weeks - answer-At how many weeks, the normal gestational sac should occupy 1/2 of the uterine cavity and show a yolk sac, embryo and heart beat? At how many weeks will it fill the uterine cavity with a well defined fetus? Trophoblastic Disease - answer-1. A group of rare tumors that involve abnormal growth of cells inside the uterus. They start in cells that would normaly develope into the placenta. Complete Hydatiform Mole - answer-Most common form of Trophoblastic Disease? Complete - answer-A Hydatidiform Mole from trophoblastic neoplasia without the presents of an embryo? Partial - answer-A Hydatidiform Mole from trophoblastic neoplasia with an abnormal embryo or fetus. Theca Lutein Cysts - answer-Functional ovarian cysts are called? Trophoblastic Disease - answer-Associated with: Hydatididform Mole Theca Lutein Cysts Pregnancy induced hypertension Hyperemesis gravidarum Large for gestational age All characteristics of?CRL - answer-Most reliable calculation for the EDC is? 11 weeks - answer-Because of spinal segmentation, CRL begins to loose accuracy after how many weeks? Vitelline Duct (omphalomesenteric duct) - answer-The structure that initially maintains a connction between the yolk sac and embryo once they diverge from each other? Contains and artery and a vein. Nuchal translucency - answer-Thickening of the nuchal soft tissue during the 1st trimester and a strong corrolation for chromosomal defects? Shirodkar Procedure - answer-A procedure preformed to treat and incompentent cervix. The most complicated, the suture is almost completely buried beneath the cervical mucosa? McDonald Procedure - answer-A procedure preformed to treat and incompentent cervix with a less invasive outcome using a purse string suture. Ectopic - answer-With this type of pregnancy, the most common symptom is pain? Interstital - answer-An ectopic pregnancy in this part of the tube is more life threatening? 3mm - answer-Normally, nuchal translucency doesn't exceed? Chorid Plexus - answer-This lies within the atria of the lateral ventricals bilaterally? Lateral Ventricular Atria - answer-In ruling out hydrocephalus, where would one 1st begin to see enlargement?1cm in largest dimension transversely - answer-The normal measurements for the lateral ventricla of the fetal brain are? 3 ossidication centers (2 posterior pointing toward each other, 1 anterior) - answer-When the fetal spine is imaged transversly, the ultrasound demonstrates? M-mode - answer-What US modality would you us to prove fetal life on a frozen image? Left Atrium - answer-The anatomic structure closest to the spine in a 4-chamber heart view is? Fetal Heart - answer-This occupies 1/3 of the chest cavity pointing toward the left side of the fetus? RVOT - Pulmonary Artery LVOT - Ascending Aorta - answer-The great vessels of the heart consist of? Foramen Ovale - answer-Communication between right and left Atria is termed? 45 degree angle to the left of midline - answer-In a normal fetus, the heart is positioned at what angle? Chordae Tendineae / papillary muscle - answer-A small rounded echoginic structure withing the left ventrical of the heart is? Coronal - answer-Which view best demonstrated the diaphram? Transverse @ the level of 4-chamber heartTransverse view @ level of 4-chamber heart - answer-The thoracic circumference is measured in the? Aortic Arch - answer-The candy-cane pulsating vessel imaged somewhat to the left of the spine in longitudinal is? Esophageal Artesia - answer-The fluid filled stomach should always be seen in the upper LT quadrant. If not seen, you should suspect? Esophagel Atresia - answer-The esophagus does not properly develop or is missing? 12-13 weeks - answer-At what gestational age is the amniotic fluid volume and fluid in the fetal bladder almost entirely due to functioning kidneys? 30-45 mins. - answer-The fetal bladder should fill and empty approximatly every? Posterior Urethral Valves - answer-The bladder of the male fetus is sometimes enlarged because of? Most common cause of male fetus bladder obstruction outlet? Clocal Malformation or Urethral Atresia - answer-Most common female bladder obstruction outlet? Iliac Bones - answer-What structures can be seen at the level of the bladder using a coronal view of the fetal pelvis on an OB exam?Abdomenal Circumference - answer-When you image the fetal stomach transverse at the level of the portal vien, you are at the right level for what measurement? MSAFP Triple Screen CVS Amniocentesis - answer-What lab tests are performed to determine if a fetus has a neural tube defect or Down's syndrome? Amniocentesis - answer-This test can rule out Down's syndrome? Fetal Anatomy - answer-2nd trimester OB US are better than 1st trimester in determining? Vertex - answer-Most favortable position of the baby for birth where the crown area of the head presents first? Vasa Previa - answer-In sagittal midline view, if the cord is positioned near the cervical os, this is called? 37 weeks - answer-Dr's usually don't consider a C-section due to previa until what gestational week? Chorion and Decidua - answer-Th placenta developes from the? Excessive Wharton's jelly - answer-A thickened appearing cord is most likely from? Functions of the placenta - answer-This produces alpha-fetoprotein, provides nurishment for the fetus as well as protection?Succenturiate Placenta - answer-An accessory placenta lobe is called? 2cm - answer-A placenta previa can be ruled out if the placental edge is at least how far from the internal cervical os? Placenta Accreta - answer-A severe OB complication involving an abnormally deep attachment of the placenta through the endometrium and myometrium? Hydrops Infection Triploidy-lethal chromosome abnormality (69 instead of 46) Diabetes - answer-A placental measuring 7cm in the greatest AP dimension may be associated with? 4cm - answer-The thickness of the full-term placental should not measure more than? Chorioangioma - answer-Benign vascular tumors of the placenta, large ones can cause IUGR, Hydrops and Abruption? Superoir to fetal bladder - answer-To demonstrate umbilical cord insertion into the fetal abdomen, you should look? 2 umbilical arteries - answer-Applying color Doppler to the transverse image through the fetal bladder will help verify? Placental Abruption - answer-The placental lining has separted from the uterus. Most common pathological cause of late pregnancy bleeding?BPD/OFD x 100 - answer-Cephalic Index formula? Dolichocephaly - answer-Cephalic Index below 70%, head shape that is long and narrow? Brachycephaly - answer-Cephalic Index above 85%, head shape that is abnormally short? 70 to 85% - answer-Normal Cephalic Index range? CRL @ 10 weeks - answer-The best method and time for estimating gestational age would be? 30 weeks - answer-Cerebellar measurements can be used to estimate gestational age but loose accuracy after? 30 weeks - answer-Epiphyseal centers will not be identified sonographically until after? Leading Edge - answer-BPD position calipers on outer edge of anterior skull and inner edge of posterior skull is termed? Amniocentesis - answer-Fetal lung maturity is best determined by? Naegele's rule (approx. 280 days) - answer-One can caluclate a patient's due date by adding 9 months + 7 days to the 1st day of last period. This is done according to?