PU Doppler Ultrasound in Pregnancy 2

Question 1

What is the cerebroplacental ratio (CPR) and why is it significant?

Accepted Answer

MCA PI divided by UA PI; low CPR indicates brain-sparing and fetal compromise

Answer

The CPR is calculated as MCA PI divided by UA PI; a ratio below 1.0 indicates brain-sparing (redistribution) and is associated with adverse perinatal outcomes.

Question 2

Peak systolic velocity (PSV) in the middle cerebral artery is used to diagnose which fetal condition?

Accepted Answer

Fetal anemia

Answer

MCA PSV greater than 1.5 multiples of the median (MoM) for gestational age is the standard non-invasive method to screen for fetal anemia.

Question 3

What does reversed flow in the ductus venosus (DV) indicate?

Accepted Answer

Severely abnormal cardiac function and imminent fetal deterioration

Answer

Reversed or absent flow in the ductus venosus a-wave indicates elevated cardiac afterload and severe cardiac compromise, signaling imminent fetal deterioration.

Question 4

Which Doppler measurement is used in the biophysical profile scoring?

Accepted Answer

Doppler findings are not part of the standard biophysical profile

Answer

The classic biophysical profile (BPP) consists of five components including fetal breathing, movements, tone, amniotic fluid, and NST — Doppler is not a standard BPP component.

Question 5

What is a normal umbilical artery S/D ratio in the third trimester?

Accepted Answer

Less than 3.0

Answer

In the third trimester, a normal umbilical artery S/D ratio is generally less than 3.0; higher values indicate elevated placental resistance.

PU - Pregnancy Ultrasound Certification Practice Test

PU - Pregnancy Ultrasound Certification Practice Test

PU Doppler Ultrasound in Pregnancy 2