PU First Trimester Ultrasound and Dating

Question 1

What is the earliest structure visualized on transvaginal ultrasound in a normal intrauterine pregnancy?

Accepted Answer

Gestational sac

Answer

Yolk sac

Answer

Fetal pole

Answer

Fetal heartbeat

Question 2

At what beta-hCG level should a gestational sac be visible on transvaginal ultrasound?

Accepted Answer

1,500–2,000 mIU/mL

Answer

500 mIU/mL

Answer

5,000 mIU/mL

Answer

10,000 mIU/mL

Question 3

What is the normal location for a yolk sac in early pregnancy?

Accepted Answer

Within the gestational sac between the amnion and chorion

Answer

Inside the embryo

Answer

Outside the gestational sac

Answer

Adjacent to the decidua

Question 4

What is the double decidual sac sign (DDSS)?

Accepted Answer

Two concentric rings of decidua surrounding the gestational sac, confirming intrauterine location

Answer

A twin pregnancy

Answer

A sign of ectopic pregnancy

Answer

The appearance of a bicornuate uterus

Question 5

What crown-rump length (CRL) corresponds to the first detectable fetal cardiac activity?

Accepted Answer

2–4 mm (approximately 5.5–6 weeks)

Answer

8–10 mm

Answer

15 mm

Answer

1 mm

Question 6

What is the intradecidual sign on early pregnancy ultrasound?

Accepted Answer

A small gestational sac embedded eccentrically within the decidua before a double sac is formed

Answer

A sign of miscarriage

Answer

The appearance of a cornual pregnancy

Answer

Normal cervical mucus