OB/GYN ARDMS Registry Review OB/GYN Registry Review 2026 With

OB/GYN ARDMS REGISTRY REVIEW

(OB/GYN REGISTRY REVIEW) 2026

WITH ANSWERS

• The primitive hindbrain can be seen as a cystic structure within the embryonic head?
• Prosencephalon
• Mesencephalon
• Rhombencephalon
• Diencephalon

Correct Answer: C) Rhombencephalon

• The maternal side of the developing placenta is referred to as the?
• Decidua Capsularis
• Decidua Parietalis
• Decidua Basalis
• Chorion Frondosum

Correct Answer: C) Decidua Basalis

• Up to 10 weeks gestational age, the mean diameter of the normal gestational sac should

grow?

• 0.5 mm/day
• 1 mm/day
• 1.5 mm/day
• 2 mm/day

Correct Answer: B) 1 mm/day

• Physiologic herniation of fetal intestines outside the abdomen should not be seen after

what gestational age?

• 10 weeks, CRL > 35mm
• 12 weeks, CRL > 45mm
• 14 weeks, CRL > 55mm
• 16 weeks, CRL > 65mm

Correct Answer: B) 12 weeks, CRL measures > 45mm

• The base of the umbilical cord should not exceed?
• 5 mm
• 7 mm
• 9 mm
• 11 mm

Correct Answer: B) 7 mm

• One should be able to transabdominally image a gestational sac when the IRC level for

hCG is = or >? Transvaginally?

• 1800 units/liter transabdominally; 1000 units/liter transvaginally
• 3600 units/liter transabdominally; 2000 units/liter transvaginally
• 4000 units/liter transabdominally; 3000 units/liter transvaginally
• 5000 units/liter transabdominally; 1500 units/liter transvaginally

Correct Answer: B) 3600 units/liter transabdominally; 2000 units/liter transvaginally

• Patient is 10 weeks by menstrual dates with pregnancy induced hypertension. You suspect?
• Ectopic Pregnancy
• Hydatidiform Mole
• Placenta Previa
• Normal Gestation

Correct Answer: B) Hydatidiform Mole

• Almost always pathognomonic of a molar pregnancy in the 1st trimester?
• Preeclampsia
• Hypotension
• Gestational Diabetes
• Oligohydramnios

Correct Answer: A) Preeclampsia

• Pregnant patient presents with bleeding and cramping. What would be suspect of an

inevitable abortion?

• Closed cervix
• Dilated cervix
• Empty uterus
• Thickened endometrium

Correct Answer: B) Dilated cervix

• An ectopic with a normal IUP?
• Cornual pregnancy
• Cervical pregnancy
• Heterotopic pregnancy
• Interstitial pregnancy

Correct Answer: C) Heterotopic pregnancy

• To differentiate an early IUP from a pseudogestational sac, it is helpful to visualize?
• Fetal pole
• Yolk Sac
• Amnion
• Chorion

Correct Answer: B) Yolk Sac

• A yolk sac is considered abnormal when its diameter exceeds? Shape? Appearance?
• 4mm; perfectly round; anechoic
• 5mm; oval; thick-walled
• 6mm; irregularly shaped; calcified
• 8mm; teardrop; cystic

Correct Answer: C) 6mm; Irregularly shaped; Calcified

• What drug can be used to treat an early unruptured ectopic pregnancy in order to preserve

fertility?

• Clomiphene
• Methotrexate
• Mifepristone
• Misoprostol

Correct Answer: B) Methotrexate

• The most common position of a uterus is?
• Retroverted
• Retroflexed
• Anteflexed
• Anteverted

Correct Answer: C) Anteflexed

• In a ruptured ectopic pregnancy, which section of the tube is most life threatening? Why?
• Ampulla; largest section
• Isthmus; narrowest section
• Interstitial; rupture is accompanied by bleeding from the uterine arteries
• Fimbriae; opens to peritoneum

Correct Answer: C) Interstitial; Rupture is accompanied by bleeding from the uterine arteries