Labor and Delivery Practice Questions

Q: When the head of a baby is markedly deflexed during labor, which diameter typically engages?

Occipitofrontal. ### Explanation The presentation of the fetal head depends entirely on the degree of flexion or extension. In a normal labor process, the head is well-flexed, presenting the smallest diameter. **1. Why Occipitofrontal is Correct:** When the head is **markedly deflexed** (also known as the "military attitude"), the head is neither flexed nor extended. In this neutral position, the **Occipitofrontal diameter** becomes the engaging diameter. It measures approximately **11.5 cm** and extends from the prominent point of the occiput to the root of the nose (glabella). This diameter is larger than the fully flexed diameter, often leading to a more protracted labor. **2. Analysis of Incorrect Options:** * **Suboccipitof rontal (10 cm):** This diameter engages when the head is **partially deflexed**. It extends from the suboccipital region to the anterior end of the anterior fontanelle. * **Mentovertical (13.5 cm):** This is the largest diameter of the fetal head, engaging during a **Brow presentation** (partial extension). It extends from the chin to the highest point on the vertex. * **Submentovertical (11.5 cm):** This diameter engages in a **Face presentation** when the head is incompletely extended. **3. Clinical Pearls for NEET-PG:** * **Well-Flexed Head (Vertex):** Engaging diameter is **Suboccipitobregmatic (9.5 cm)**. This is the ideal diameter for vaginal delivery. * **Completely Extended Head (Face):** Engaging diameter is **Submentobregmatic (9.5 cm)**. * **Mnemonic for Diameters:** Remember that as the head moves from flexion to extension, the engaging diameter increases (9.5 → 10 → 11.5 → 13.5) before decreasing again in face presentations (11.5 → 9.5). * **Military Attitude:** Often associated with an occipitoposterior position, it may spontaneously flex as labor progresses or persist, leading to transverse arrest.

Q: All of the following are TRUE regarding engagement of the head, EXCEPT?

Two-fifths of the head may be palpable per abdomen.. **Explanation:** Engagement is defined as the passage of the largest transverse diameter of the fetal head (the **biparietal diameter**) through the plane of the pelvic inlet. **Why Option D is the Correct Answer (The False Statement):** In clinical practice, engagement is assessed using the **Crichton’s rule of fifths** via abdominal palpation. A head is considered **engaged** when **two-fifths (2/5) or less** of the fetal head is palpable above the pelvic brim. If **three-fifths (3/5)** or more of the head is palpable, it is considered high or non-engaged. Therefore, stating that "two-fifths may be palpable" is technically a sign of engagement, but in the context of standard NEET-PG questions, the threshold for a head being "definitively engaged" is when only **0/5 or 1/5** remains palpable. Option D is the "least true" or the distractor because 2/5 is the borderline transition point, whereas 0/5 and 1/5 are definitive signs of engagement. **Analysis of Other Options:** * **Option A:** If only 1/5th of the head is palpable, the widest diameter has already passed the inlet; thus, the head is engaged. * **Option B:** On vaginal examination, when the head is engaged, the leading bony part (vertex) typically reaches the level of the **ischial spines** (Station 0). * **Option C:** This is the anatomical definition of engagement. **High-Yield Clinical Pearls for NEET-PG:** * **Engagement in Primigravida:** Usually occurs 2–3 weeks before the onset of labor (Lightening). * **Engagement in Multigravida:** Often occurs at the onset of labor or after the rupture of membranes. * **Rule of Fifths:** 5/5 (Floating), 3/5 (Mobile at brim), 2/5 (Engaged/Fixed), 0/5 (Deeply engaged). * **Station 0:** Corresponds to the vertex at the level of the ischial spines.

Q: Partogram is used for:

Recording progress of labor. **Explanation:** The **Partogram** (or Partograph) is a composite graphical record of key data (maternal and fetal) during the active phase of labor. Its primary objective is the **early identification of deviations from normal labor progress**, allowing for timely intervention to prevent prolonged or obstructed labor. * **Why Option D is Correct:** The partogram tracks the three essential components of labor progress: **cervical dilatation** (the most critical indicator), **descent of the fetal head**, and **uterine contractions**. By plotting these against time, clinicians can visualize if labor is following the expected physiological curve (Friedman’s curve). * **Why Options A, B, and C are Incorrect:** * **Option A:** While Fetal Heart Rate (FHR) is recorded on a partogram, its primary *purpose* is not FHR analysis; that is the role of **Cardiotocography (CTG)** or intermittent auscultation. * **Option B:** The partogram records cervical *dilatation* and *effacement*, not just the *position* (anterior/posterior) of the cervix. * **Option C:** The integrity of the utero-placental unit is typically assessed via **Biophysical Profile (BPP)** or **Doppler studies**, not a partogram. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Modified Partograph:** Starts at the **Active Phase**, defined as **≥ 4 cm** cervical dilatation (Note: Recent WHO Labor Care Guide suggests 5 cm, but 4 cm remains the standard for most exams). * **Alert Line:** A line representing the rate of 1 cm/hour dilatation. Crossing it indicates the need for transfer or increased vigilance. * **Action Line:** Drawn **4 hours to the right** of the alert line. Crossing it indicates a need for critical intervention (e.g., amniotomy, oxytocin, or C-section). * **Latent Phase:** Not included in the WHO Modified Partograph to avoid unnecessary early interventions.

Q: During active labor, what is the recommended cervical dilatation per hour in a primigravida?

1.0 cm. **Explanation:** The correct answer is **1.0 cm/hr**. This value is based on the classic **Friedman’s Curve**, which defines the minimum expected rate of cervical dilatation during the active phase of labor. **1. Why 1.0 cm/hr is correct:** In a primigravida, the active phase of labor (traditionally starting at 3–4 cm dilatation) is characterized by a more gradual progression compared to multigravidas. According to Friedman, the minimum rate of dilatation in a primigravida is **1.2 cm/hr**, but for clinical and examination purposes (and per WHO Partograph guidelines), **1 cm/hr** is the standard threshold used to identify normal progress. **2. Analysis of Incorrect Options:** * **B (1.5 cm/hr):** This is the minimum expected rate for a **multigravida**. Multigravidas progress faster due to reduced soft tissue resistance. * **C (1-7 cm):** This is a range of dilatation, not a rate (cm/hr), and is clinically irrelevant as a measure of progress. * **D (2 cm/hr):** This exceeds the average rate for a primigravida and is not used as a diagnostic threshold for normal labor. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Guidelines (Recent Change):** While Friedman used 3–4 cm, the WHO now defines the active phase as starting at **5 cm** dilatation. However, the "1 cm/hr" rule remains the gold standard for the **Alert Line** on a partograph. * **Protracted Active Phase:** Dilatation <1.2 cm/hr (Primi) or <1.5 cm/hr (Multi). * **Arrest of Dilatation:** No cervical change for ≥2 hours in the active phase. * **Friedman’s Stages:** Remember that in primigravidas, **effacement** usually precedes dilatation, whereas in multigravidas, both occur simultaneously.

Q: Which of the following is an absolute contraindication for vaginal delivery?

Central placenta previa. **Explanation:** **Central Placenta Previa (Type IV)** is an absolute contraindication for vaginal delivery because the placenta completely covers the internal os. As the cervix dilates during labor, the placental attachments are inevitably sheared off, leading to catastrophic, life-threatening maternal hemorrhage and fetal exsanguination. In such cases, elective cesarean section is mandatory. **Analysis of Incorrect Options:** * **Previous Cesarean Section:** This is a *relative* contraindication. Many women are candidates for **VBAC** (Vaginal Birth After Cesarean) or **TOLAC** (Trial of Labor After Cesarean), provided the previous incision was a low transverse uterine incision and there are no other complications. * **Breech Presentation:** While often delivered via cesarean to reduce neonatal morbidity, vaginal breech delivery is possible in specific circumstances (e.g., frank breech, adequate pelvis, multiparity) and is therefore a *relative* contraindication. * **Heart Disease in Pregnancy:** Most cardiac patients are actually encouraged to have a **planned vaginal delivery** (often with an assisted second stage using forceps/ventouse to limit maternal pushing) because it involves less blood loss and lower risk of postoperative thromboembolism compared to surgery. **NEET-PG High-Yield Pearls:** * **Absolute Contraindications to Vaginal Delivery:** Central placenta previa, vasa previa, pelvic inlet contraction (CPD), active genital herpes, and transverse lie. * **Management of Placenta Previa:** If the placental edge is **>2 cm** from the internal os, vaginal delivery can be attempted. If **<2 cm or covering the os**, cesarean is required. * **Stallworthy’s Sign:** A drop in fetal heart rate when the head is pressed into the pelvis, seen in posterior placenta previa.

Q: A previous cesarean section was performed. Which of the following is NOT an indication for an elective repeat cesarean section?

Polyhydramnios. **Explanation:** The decision for a Trial of Labor After Cesarean (TOLAC) versus an Elective Repeat Cesarean Section (ERCS) depends on the risk of uterine rupture and the likelihood of a successful vaginal birth. **Why Polyhydramnios is the correct answer:** Polyhydramnios (excess amniotic fluid) is **not** a contraindication to TOLAC. While it may cause uterine overdistension, it does not significantly increase the risk of uterine rupture in a patient with a previous lower segment cesarean section (LSCS) scar. Management typically involves monitoring for cord prolapse upon rupture of membranes, but it does not necessitate a repeat surgery. **Analysis of incorrect options:** * **Breech presentation:** A malpresentation in a scarred uterus is a standard indication for ERCS. The risks associated with vaginal breech delivery (e.g., head entrapment) combined with the risk of scar dehiscence make TOLAC unfavorable. * **Macrosomia:** An estimated fetal weight >4000g–4500g in a patient with a previous LSCS increases the risk of shoulder dystocia and uterine rupture due to cephalopelvic disproportion (CPD). Most guidelines recommend ERCS in these cases. * **Post-term pregnancy:** Pregnancies exceeding 41–42 weeks often require induction of labor. Induction (especially with prostaglandins) in a scarred uterus significantly increases the risk of rupture compared to spontaneous labor. Therefore, ERCS is often preferred. **High-Yield Clinical Pearls for NEET-PG:** * **Success Rate:** The success rate of Vaginal Birth After Cesarean (VBAC) is approximately **60–80%**. * **Uterine Rupture Risk:** The risk of rupture for a single previous transverse LSCS is **0.5–1%**, whereas for a classical (vertical) scar, it is **4–9%** (absolute contraindication for TOLAC). * **Prerequisite for TOLAC:** The previous surgery must have been a **lower segment** incision, and the current facility must have "emergency backup" for immediate surgery.

Q: Blood in urine during labor is diagnostic of:

Obstructed labor. **Explanation:** **Obstructed labor** is the correct answer because hematuria is a classic clinical sign of prolonged pressure on the maternal soft tissues. In obstructed labor, the fetal presenting part is tightly wedged against the maternal symphysis pubis. This causes significant compression of the **bladder and urethra**, leading to pressure necrosis, capillary damage, and subsequent bleeding into the urinary tract. Hematuria in this context is often a precursor to the formation of a vesicovaginal fistula (VVF). **Analysis of Incorrect Options:** * **Impending scar rupture:** While hematuria can occasionally be seen in actual uterine rupture, the most characteristic signs of *impending* rupture are a pathological retraction ring (Bandl’s ring), intense abdominal pain, and fetal distress. Hematuria is more specific to the mechanical trauma of obstruction. * **Urethral injury:** While this causes blood in the urine, it is usually a result of direct trauma (e.g., forceps delivery or catheterization) rather than a diagnostic feature of the labor process itself. * **Cystitis:** This is a pre-existing or postpartum infection. While it causes microscopic or gross hematuria, it is accompanied by frequency, urgency, and dysuria, and is not a diagnostic hallmark of labor progression. **High-Yield Clinical Pearls for NEET-PG:** * **Bandl’s Ring:** A pathognomonic sign of obstructed labor, representing the visible junction between the thickened upper uterine segment and the thinned-out lower segment. * **Vesicovaginal Fistula (VVF):** The most common cause of VVF in developing countries is neglected obstructed labor due to ischemic necrosis. * **Triad of Obstructed Labor:** Maternal exhaustion/dehydration, Bandl’s ring, and features of fetal distress. * **Management:** Obstructed labor is a surgical emergency; the definitive management is almost always a **Cesarean Section**.

Question 1

When the head of a baby is markedly deflexed during labor, which diameter typically engages?

Accepted Answer

Occipitofrontal

Answer

Suboccipitorontal

Answer

Mentovertical

Answer

Submentovertical

Question 2

Which type of delivery is safest in maternal heart disease?

Accepted Answer

Outlet forceps

Answer

Vaginal

Answer

Cesarean section

Answer

Mid-cavity forceps

Question 3

All of the following are TRUE regarding engagement of the head, EXCEPT?

Accepted Answer

Two-fifths of the head may be palpable per abdomen.

Answer

One fifth of the head may be palpable per abdomen.

Answer

The vertex will be at the level of the ischial spine.

Answer

The biparietal diameter has passed through the pelvic inlet.

Question 4

Partogram is used for:

Accepted Answer

Recording progress of labor

Answer

Determining pattern of fetal heart rate

Answer

Determining position of cervix

Answer

Assessing integrity of utero-placental unit

Question 5

During active labor, what is the recommended cervical dilatation per hour in a primigravida?

Accepted Answer

1.0 cm

Answer

1.5 cm

Answer

1-7 cm

Answer

2 cm

Question 6

Which of the following is an absolute contraindication for vaginal delivery?

Accepted Answer

Central placenta previa

Answer

Previous cesarean section

Answer

Breech presentation

Answer

Heart disease in pregnancy

Question 7

Which of the following is true about significant variable decelerations?

Accepted Answer

A drop in fetal heart rate to less than 70 bpm for 60 seconds

Answer

A drop in fetal heart rate to less than 90 bpm for 60 seconds

Answer

A drop in fetal heart rate to less than 100 bpm for 60 seconds

Answer

A drop in fetal heart rate to less than 80 bpm for 60 seconds

Question 8

A previous cesarean section was performed. Which of the following is NOT an indication for an elective repeat cesarean section?

Accepted Answer

Polyhydramnios

Answer

Breech presentation

Answer

Macrosomia

Answer

Post-term pregnancy

Question 9

A 25-year-old G1P0 delivers a 33-week infant vaginally. The delivery is uncomplicated. If the obstetrician wishes to optimize the outcome for the infant, when should the umbilical cord be clamped?

Accepted Answer

Between 30 and 60 seconds

Answer

Immediately

Answer

After 60 seconds

Answer

Leave the cord unclamped until delivery of the placenta

Question 10

Blood in urine during labor is diagnostic of:

Accepted Answer

Obstructed labor

Answer

Impending scar rupture

Answer

Urethral injury

Answer

Cystitis

Labor and Delivery — MCQs

Labor and Delivery — MCQs

On this page

Practice by Chapter

Want unlimited practice?