Maternal-Fetal Medicine Practice Questions

Q: Which of the following tests is used to estimate the amount of feto-maternal hemorrhage?

Kleihauer Betke test. **Explanation:** The **Kleihauer-Betke (KB) test** is the gold standard for quantifying the volume of feto-maternal hemorrhage (FMH). It is based on the principle of **acid elution**. Fetal hemoglobin (HbF) is resistant to acid elution, whereas adult hemoglobin (HbA) is sensitive. When a maternal blood smear is treated with acid and stained, adult RBCs appear as pale "ghost cells," while fetal RBCs remain dark pink. By counting the ratio of fetal to maternal cells, the volume of FMH can be calculated using the formula: *Volume of FMH (mL) = (% of fetal cells × 50).* This is clinically vital for calculating the required dose of Anti-D immunoglobulin in Rh-negative mothers. **Analysis of Incorrect Options:** * **Coombs' test:** Used to detect antibodies against RBCs. The Indirect Coombs' Test (ICT) screens for maternal sensitization, while the Direct Coombs' Test (DCT) detects antibodies on the newborn's RBCs (e.g., in Hemolytic Disease of the Newborn). * **Liley’s Spectrophotometry:** Historically used to assess the severity of fetal hemolysis by measuring **bilirubin levels** in amniotic fluid (at 450 nm) and plotting them on a Liley chart. * **Schrill's test:** This is a distractor; it is not a standard test in OBGYN. (Note: It is often confused with the *Schilling test* used for Vitamin B12 absorption). **High-Yield Clinical Pearls for NEET-PG:** * **Screening vs. Quantification:** The **Rosette test** is the initial qualitative screening test for FMH. If positive, the **KB test** is performed for quantification. * **Anti-D Dosing:** One 300 mcg vial of Anti-D neutralizes **30 mL** of fetal whole blood (or 15 mL of packed RBCs). * **Alternative:** Flow cytometry is increasingly replacing the KB test due to better precision and less inter-observer variability.

Q: Which of the following statements regarding epilepsy in pregnancy is true?

Monotherapy is preferred over polydrug therapy.. **Explanation:** **1. Why Monotherapy is Preferred:** The primary goal in managing epilepsy during pregnancy is to achieve seizure control using the lowest effective dose of a single drug. **Monotherapy** is preferred because the risk of major congenital malformations (MCMs) increases significantly with **polytherapy** (the use of multiple anti-epileptic drugs). For example, combining Valproate with other drugs exponentially increases the risk of neural tube defects and cognitive impairment compared to using a single agent. **2. Analysis of Incorrect Options:** * **Option A:** In reality, seizure frequency remains **unchanged in about 50-60%** of patients. It increases in approximately 20-30% of cases, often due to physiological changes (increased volume of distribution, increased renal clearance, or sleep deprivation). * **Option C:** There is a **genetic predisposition**; the incidence of epilepsy in offspring is higher (approx. 2-5%) compared to the general population (approx. 1%). * **Option D:** Breastfeeding is **not contraindicated**. While AEDs are secreted in breast milk, the benefits of breastfeeding generally outweigh the risks. Infants should simply be monitored for sedation or poor feeding. **3. Clinical Pearls for NEET-PG:** * **Pre-conception:** Start **Folic acid (5 mg/day)** at least 3 months prior to conception to reduce NTD risks. * **Drug of Choice:** **Lamotrigine** and **Levetiracetam** are generally considered the safest options. **Valproate** is the most teratogenic and should be avoided if possible. * **Vitamin K:** To prevent hemorrhagic disease of the newborn, 1 mg of Vitamin K is administered to the neonate at birth (especially if the mother is on enzyme-inducing drugs like Phenytoin or Phenobarbital).

Q: Anti-phospholipid antibodies are not typically tested in which of the following conditions?

Polyhydramnios. **Explanation:** The core pathophysiology of **Antiphospholipid Antibody Syndrome (APS)** in pregnancy involves a prothrombotic state and placental insufficiency. Antibodies (Lupus anticoagulant, Anti-cardiolipin, and Anti-β2-glycoprotein I) cause thrombosis in the placental vasculature and inhibit trophoblast invasion, leading to decreased placental perfusion. **Why Polyhydramnios is the Correct Answer:** Polyhydramnios (excess amniotic fluid) is typically associated with fetal anomalies (e.g., esophageal atresia), maternal diabetes, or multiple gestations. It is **not** a manifestation of placental vascular compromise. In contrast, APS is characteristically associated with **Oligohydramnios** due to placental insufficiency and reduced fetal renal perfusion. **Analysis of Incorrect Options:** * **Recurrent Abortion:** This is a hallmark of APS. The clinical criteria for APS include ≥3 consecutive spontaneous abortions before 10 weeks, or ≥1 unexplained death of a morphologically normal fetus at ≥10 weeks. * **IUGR:** Placental infarction and reduced nutrient transfer caused by APS lead to fetal growth restriction. * **Mild Preeclampsia:** APS is a significant risk factor for placental-mediated hypertensive disorders. Testing is indicated if a patient develops severe preeclampsia or eclampsia before 34 weeks of gestation. **NEET-PG High-Yield Pearls:** * **Sapporo Criteria:** Diagnosis requires at least one clinical (vascular thrombosis or pregnancy morbidity) and one laboratory criterion (positive tests 12 weeks apart). * **Treatment:** The standard of care for APS in pregnancy is **Low Dose Aspirin (LDA)** and **Low Molecular Weight Heparin (LMWH)**. * **Most Specific Test:** Anti-β2-glycoprotein I is the most specific, while Lupus Anticoagulant is the strongest predictor of pregnancy complications.

Q: What is the least common site of ectopic pregnancy?

Interstitial part. **Explanation:** The site of an ectopic pregnancy is determined by where the blastocyst implants outside the uterine cavity. Over 95% of ectopic pregnancies occur in the Fallopian tube. **1. Why the Interstitial part is the correct answer:** The **interstitial (intramural) part** is the segment of the Fallopian tube that traverses the muscular wall of the uterus. It is the **least common tubal site**, accounting for only about **2–3%** of cases. Because this area is surrounded by thick myometrium, it can accommodate a larger gestational sac before rupturing (usually between 12–16 weeks), often leading to life-threatening hemorrhage due to its proximity to the uterine and ovarian vessels. **2. Why the other options are incorrect:** * **Ampulla (Option C):** This is the **most common** site of ectopic pregnancy (approx. 70–80%). It is the widest part of the tube where fertilization typically occurs. * **Isthmus (Option B):** This is the second most common site (approx. 12%). Rupture occurs early here (6–8 weeks) because the lumen is narrow and non-distensible. * **Fimbrial end (Option D):** This accounts for about 5% of cases. It is more common than the interstitial part but less common than the ampulla or isthmus. **Clinical Pearls for NEET-PG:** * **Most common overall site:** Ampulla (70-80%). * **Least common tubal site:** Interstitial (2-3%). * **Most common non-tubal site:** Ovary (followed by abdominal and cervical). * **Highest risk of mortality:** Interstitial pregnancy (due to delayed rupture and massive bleeding). * **Classic Triad:** Amenorrhea, abdominal pain, and vaginal bleeding (present in only 50% of cases).

Q: Of the following potential clinical outcomes of tubal pregnancy, which one is the commonest?

Vascular insufficiency degenerating the embryo. **Explanation:** In a tubal ectopic pregnancy, the fallopian tube lacks a well-developed decidua and sufficient space for growth. The **most common clinical outcome** is that the embryo fails to thrive due to **vascular insufficiency**, leading to early degeneration and resorption. This often occurs before the patient even realizes they are pregnant or before clinical symptoms manifest. * **Option C (Correct):** The trophoblast fails to establish a robust blood supply in the thin tubal wall. This leads to early embryonic death, followed by the formation of a tubal mole or complete resorption. * **Option A (Incorrect):** Tubal rupture is a dramatic and life-threatening complication, but it is statistically less common than early degeneration. It typically occurs when the trophoblast invades the muscularis or when the distension exceeds the tube's capacity (common in isthmic pregnancies). * **Option B (Incorrect):** Tubal abortion occurs when the products of conception are expelled through the fimbrial end into the peritoneal cavity. While common in ampullary pregnancies, it ranks second to early degeneration/resorption. * **Option D (Incorrect):** Cornual (interstitial) pregnancies are dangerous because they can grow larger due to the distensibility of the myometrium, but reaching term is extremely rare and carries a high risk of catastrophic rupture. **NEET-PG High-Yield Pearls:** * **Most common site of Ectopic Pregnancy:** Ampulla (70%). * **Most common site for Tubal Rupture:** Isthmus (due to narrow lumen). * **Most common site for Tubal Abortion:** Ampulla. * **Classic Triad:** Amenorrhea, abdominal pain, and vaginal bleeding (present in only 50% of cases). * **Gold Standard Diagnosis:** Transvaginal Ultrasound (TVUS) + Serum $\beta$-hCG (Discriminatory zone: 1500–2000 mIU/mL).

Q: What is the standard dose regimen of betamethasone for fetal lung maturation?

Two doses of 12mg, IM administered 24 hours apart. **Explanation:** Antenatal corticosteroids (ACS) are administered to women at risk of preterm delivery (24 to 34 weeks of gestation) to accelerate fetal lung maturation and reduce the incidence of Respiratory Distress Syndrome (RDS), intraventricular hemorrhage, and necrotizing enterocolitis. **1. Why Option B is Correct:** The standard, evidence-based regimen for **Betamethasone** is **12 mg intramuscularly (IM), given in two doses, 24 hours apart**. This regimen ensures optimal plasma concentrations to induce the production of surfactant by Type II pneumocytes in the fetal lungs. The maximum benefit is seen if delivery occurs between 24 hours and 7 days after the first dose. **2. Why Other Options are Incorrect:** * **Option A:** 6 mg of Betamethasone is an under-dose; the standard single dose is 12 mg. * **Option C:** This describes the standard regimen for **Dexamethasone** (6 mg IM, 4 doses, 12 hours apart). While both drugs are used, their dosing schedules are distinct. * **Option D:** This dosage is excessive and not supported by clinical guidelines, increasing the risk of maternal and fetal side effects without added benefit. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Betamethasone is often preferred over Dexamethasone because it is associated with a lower risk of periventricular leukomalacia. * **Mechanism:** Corticosteroids induce surfactant-associated proteins and improve lung compliance. * **Timing:** The "Rescue Dose" (a single repeat dose) may be considered if the initial course was given >7 days ago and the patient is still <34 weeks pregnant. * **Contraindications:** Systemic fungal infections or active maternal tuberculosis.

Q: A 27-year-old woman at 34 weeks' gestation presents to the emergency department following a motor vehicle collision. Her heart rate is 130/min and blood pressure is 150/90 mm Hg. She is alert and oriented. She complains of severe abdominal pain that began immediately after the collision. Physical examination reveals bruising over her abdomen, along with a hypertonic uterus and dark vaginal bleeding. A sonogram reveals a placental abruption, and the fetal heart tracing reveals some decelerations. Emergency laboratory tests reveal an International Normalized Ratio of 2.5, with elevated fibrin degradation products. Which of the following is the most appropriate first step in management?

Administer fresh frozen plasma.. ### Explanation The patient presents with classic signs of **Placental Abruption** (painful vaginal bleeding, hypertonic uterus) following trauma. The critical finding here is the laboratory evidence of **Disseminated Intravascular Coagulation (DIC)**: an elevated INR (2.5) and elevated fibrin degradation products (FDPs). **1. Why Fresh Frozen Plasma (FFP) is the Correct Answer:** In cases of placental abruption complicated by DIC, the immediate priority is **hemodynamic stabilization and correction of coagulopathy** before surgical intervention. Administering FFP provides necessary clotting factors to stabilize the patient. Proceeding directly to surgery (LSCS) in a patient with an INR of 2.5 without correcting the coagulopathy would lead to uncontrollable intraoperative hemorrhage and maternal mortality. **2. Why Other Options are Incorrect:** * **A. Tocolytics:** These are strictly contraindicated in placental abruption, as they can worsen maternal hemorrhage and delay necessary delivery. * **B. Corticosteroids:** While indicated for fetal lung maturity at 34 weeks, they are not the *first* step in an unstable patient with active DIC and fetal distress. * **D. Immediate LSCS:** While delivery is the definitive treatment for abruption with fetal distress, the maternal coagulopathy must be addressed first (or concurrently with blood products) to ensure the mother survives the procedure. **Clinical Pearls for NEET-PG:** * **Placental Abruption** is the most common cause of DIC in pregnancy. * **Pathophysiology:** Release of tissue thromboplastin from the damaged placenta into maternal circulation triggers the extrinsic clotting pathway. * **Management Rule:** Always stabilize the mother (ABC + Coagulopathy correction) before addressing the fetus. * **Target:** In DIC, aim to keep Fibrinogen >150 mg/dL and Platelets >50,000/µL.

Q: A young woman with six weeks amenorrhoea presents with an abdominal mass. Ultrasound shows an empty uterus. What is the most likely diagnosis?

Ectopic pregnancy. ### Explanation **Correct Answer: B. Ectopic pregnancy** The clinical triad of **amenorrhea, abdominal pain, and an empty uterus on ultrasound** in a woman of reproductive age is highly suggestive of an ectopic pregnancy until proven otherwise. At six weeks of gestation, an intrauterine gestational sac should typically be visible via transvaginal sonography (TVS). The presence of an "empty uterus" in a patient with a positive pregnancy test (implied by amenorrhea) and an adnexal/abdominal mass indicates that the blastocyst has implanted outside the uterine cavity—most commonly in the fallopian tube (95%). The "abdominal mass" in this context often represents the ectopic sac, a hematoma, or a ruptured tubal pregnancy with localized collection. **Why other options are incorrect:** * **A. Ovarian cyst:** While an ovarian cyst presents as an abdominal mass, it does not typically cause amenorrhea unless it is a functional corpus luteum cyst of pregnancy. However, the combination of amenorrhea and a mass in a clinical vignette is a classic "red flag" for ectopic pregnancy in exams. * **C. Complete abortion:** In a complete abortion, the uterus would be empty, but there would be a history of heavy vaginal bleeding and passage of products of conception. Crucially, a complete abortion would not present with a persistent abdominal mass. **NEET-PG High-Yield Pearls:** * **Discriminatory Zone:** The serum β-hCG level at which an intrauterine sac should be seen is **1500–2000 mIU/ml** (TVS) or **6500 mIU/ml** (TAS). If the uterus is empty above these levels, suspect ectopic pregnancy. * **Most common site:** Ampulla of the Fallopian tube. * **Gold Standard Diagnosis:** Laparoscopy. * **Classic Sign:** "Ring of Fire" sign (hypervascularity around the adnexal mass) on Doppler ultrasound.

Question 1

A pathologist is examining placentas from five different patients. He notes the following characteristics in the placentas: Patient A: fused dichorionic diamniotic; Patient B: dichorionic diamniotic; Patient C: circumvallate placenta; Patient D: monochorionic diamniotic. Which of the patients unquestionably gave birth to identical twins?

Accepted Answer

Patient D

Answer

Patient A

Answer

Patient B

Answer

Patient C

Question 2

Which of the following tests is used to estimate the amount of feto-maternal hemorrhage?

Accepted Answer

Kleihauer Betke test

Answer

Coombs' test

Answer

Lily's spectrophotometer

Answer

Schrill's test

Question 3

Which of the following statements regarding epilepsy in pregnancy is true?

Accepted Answer

Monotherapy is preferred over polydrug therapy.

Answer

Seizure frequency decreases in the majority of patients.

Answer

There is no increased incidence of epilepsy in the offspring.

Answer

Breastfeeding is contraindicated.

Question 4

Anti-phospholipid antibodies are not typically tested in which of the following conditions?

Accepted Answer

Polyhydramnios

Answer

Intrauterine Growth Restriction (IUGR)

Answer

Mild Preeclampsia

Answer

Recurrent Abortion

Question 5

What is the least common site of ectopic pregnancy?

Accepted Answer

Interstitial part

Answer

Isthmus

Answer

Ampulla

Answer

Fimbrial end

Question 6

Of the following potential clinical outcomes of tubal pregnancy, which one is the commonest?

Accepted Answer

Vascular insufficiency degenerating the embryo

Answer

Tubal rupture

Answer

Tubal abortion

Answer

Cornual pregnancy reaching term duration

Question 7

Anti-Rh immunoglobulin (A.R.M) is contraindicated in which of the following conditions?

Accepted Answer

When the fetus is dead

Answer

Pregnancy beyond 40 weeks

Answer

When the mother is Rh-negative

Answer

When the mother is diabetic

Question 8

What is the standard dose regimen of betamethasone for fetal lung maturation?

Accepted Answer

Two doses of 12mg, IM administered 24 hours apart

Answer

Two doses of 6mg, IM administered 24 hours apart

Answer

Four doses of 6mg, IM administered 12 hours apart

Answer

Four doses of 12mg, IM administered 12 hours apart

Question 9

A 27-year-old woman at 34 weeks' gestation presents to the emergency department following a motor vehicle collision. Her heart rate is 130/min and blood pressure is 150/90 mm Hg. She is alert and oriented. She complains of severe abdominal pain that began immediately after the collision. Physical examination reveals bruising over her abdomen, along with a hypertonic uterus and dark vaginal bleeding. A sonogram reveals a placental abruption, and the fetal heart tracing reveals some decelerations. Emergency laboratory tests reveal an International Normalized Ratio of 2.5, with elevated fibrin degradation products. Which of the following is the most appropriate first step in management?

Accepted Answer

Administer fresh frozen plasma.

Answer

Administer a tocolytic.

Answer

Administer a corticosteroid.

Answer

Deliver the fetus immediately by LSCS.

Question 10

A young woman with six weeks amenorrhoea presents with an abdominal mass. Ultrasound shows an empty uterus. What is the most likely diagnosis?

Accepted Answer

Ectopic pregnancy

Answer

Ovarian cyst

Answer

Complete abortion

Answer

None of the above

Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine — MCQs

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