10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free OB-E questions are organized by exam domain, so you can see how each part of the POCUS - Obstetrics Essentials (OB-E) blueprint is tested. Reveal the answer and explanation under each question.
During a 26-week examination, an abdominal circumference plots at the 5th percentile while the head and femur measurements are appropriate for dates. Image review shows both kidneys, but neither the stomach nor the portal sinus, in the abdominal section. The ellipse follows the outer skin correctly. Before using this result to judge growth, the operator should:
Correct answer: B - Reacquire the abdomen at the stomach and portal sinus.
At the first ultrasound of a spontaneously conceived pregnancy, menstrual dating is 9 weeks 3 days. Reproducible crown-rump length measurements indicate 10 weeks 5 days, with cardiac activity present. The patient reports regular 28-day cycles and a certain last menstrual period. Applying ACOG redating criteria, how should the estimated due date change?
Correct answer: C - Move the due date 9 days earlier, using the crown-rump length estimate.
Three femur measurements are saved at 34 weeks: 61 mm from an oblique view with one shaft end indistinct; 65 mm with both ends of the ossified shaft clearly visible along its long axis; and 69 mm on that same long-axis view when the distal caliper includes the visible epiphysis. Which value belongs in the biometric record?
Correct answer: D - 65 mm; the valid measurement excludes the distal epiphysis.
An M-mode line through the fetal heart at 30 weeks records five successive equivalent ventricular contraction peaks. The time from the first peak to the fifth is 1.8 seconds. The maternal pulse is 78 beats/min. Select the interpretation of this brief measurement.
Correct answer: B - About 133 beats/min; within the usual later-pregnancy range.
During labor, ultrasound confirms a flexed cephalic presentation. The fetal face and orbits are directed toward the mother's right posterior pelvis. What is the fetal head position?
Correct answer: D - Left occiput anterior
An asymptomatic patient at 21 weeks asks whether her baby's position needs treatment. Ultrasound shows the buttocks nearest the cervix, flexed hips, extended knees, and feet beside the head. Biometry, fluid, and cardiac activity are appropriate for gestation. Which assessment and plan fit these findings?
Correct answer: C - Frank breech; document the presentation and reassess later in pregnancy.
A patient at 31 weeks is under obstetric assessment after a small, painless vaginal bleed. She is hemodynamically stable. Transabdominal ultrasound shows a low posterior placenta, but fetal head shadowing obscures the internal cervical os. Which examination should be used next to define the placental edge-to-os relationship?
Correct answer: A - Transvaginal ultrasound with an appropriately trained operator
An ultrasound report uses the traditional classification of placenta previa. Which anatomical description supports partial, rather than marginal, placenta previa?
Correct answer: D - Placental tissue overlaps only part of the internal os.
The largest apparent fluid pocket in a 33-week pregnancy is 3.6 cm deep but contains umbilical cord. A complete sweep identifies a cord-free pocket measuring 1.6 cm vertically and 2.2 cm horizontally, without fetal parts; every other eligible pocket is shallower. Which amniotic-fluid assessment is correct?
Correct answer: B - DVP 1.6 cm, consistent with oligohydramnios.
Emergency obstetric care is underway for a patient at 34 weeks with painful vaginal bleeding and hypotension. POCUS shows a cephalic fetus, a placental edge 45 mm from the internal cervical os, a cord-free DVP of 4.1 cm, and cardiac activity at 146 beats/min. No retroplacental collection is visible. Which complication remains possible despite these ultrasound findings?
Correct answer: A - Placental abruption
The full bank has 1,020 more OB-E questions with explanations.
Continue in the free practice test →
View plans