Prenatal Care — MCQs
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Conservative management of placenta previa was advocated by whom?
A 30-year-old G3P2 patient presents at 20 weeks gestation with a history of two previous large babies (4.6 kg and 4.8 kg, both delivered via cesarean section). She is suspected of having gestational diabetes and undergoes a glucose challenge test. Following a 50g oral glucose load, her blood sugar level is 206 mg/dL, confirming gestational diabetes. Which of the following is NOT a known complication of gestational diabetes?
Post-term pregnancy is defined as a pregnancy which continues beyond:
A 34-year-old patient in her second trimester of pregnancy presents for an antenatal ultrasound. Her beta-hCG levels are elevated, and her AFP levels are decreased. She has a 5-year-old child with no history of chromosomal abnormalities. What is the most likely diagnosis?
Prophylactic screening for Group B streptococcal infection in pregnancy is performed during which gestational period?
A patient presents with a missed menstrual period of 4 weeks and denies common early pregnancy symptoms like nausea, fatigue, urinary frequency, or breast tenderness. She is anxious about a potential pregnancy due to a history of ectopic pregnancy and desires early prenatal care. Which of the following evaluation methods is most sensitive in diagnosing pregnancy?
What is the risk of Down's syndrome in women over 35 years of age?
A pregnant lady in her first trimester presents with vaginal bleeding. On examination the os is closed and uterine size corresponds to the period of amenorrhoea. What is the most likely condition?
At what level of beta-hCG can a normal pregnancy be earliest detected by transvaginal ultrasonography (TVS)?
Antenatal diagnosis of all of the following disorders is possible EXCEPT:
Prenatal Care Indian Medical PG Practice Questions and MCQs
Question 121: Conservative management of placenta previa was advocated by whom?
- A. Cadwell and Moloy
- B. Priscilla White
- C. Macafee and Johnson (Correct Answer)
- D. Sher and Page
Explanation: **Explanation:** The correct answer is **Macafee and Johnson**. Historically, placenta previa was managed by immediate delivery regardless of gestational age, leading to high rates of iatrogenic prematurity. In 1945, **Macafee** and **Johnson** independently advocated for a **conservative (expectant) management** approach. The underlying medical concept is to prolong the pregnancy until fetal lung maturity is achieved (ideally 37 weeks), provided that the maternal condition is stable and there is no active, life-threatening hemorrhage. This approach significantly reduced perinatal mortality without increasing maternal risk. **Analysis of Incorrect Options:** * **A. Caldwell and Moloy:** Famous for the **classification of the female pelvis** (Gynecoid, Android, Anthropoid, and Platypelloid) based on the shape of the pelvic inlet. * **B. Priscilla White:** Known for the **White’s Classification of Diabetes in Pregnancy**, which categorizes gestational and pre-gestational diabetes based on age of onset, duration, and vascular complications. * **D. Sher and Page:** Associated with the classification and management of **Abruptio Placentae**, specifically focusing on the grading of severity. **High-Yield Clinical Pearls for NEET-PG:** * **Macafee Regime Criteria:** Patient must be <37 weeks, hemodynamically stable, and fetal distress must be absent. * **Hospitalization:** Conservative management must always be done in a hospital setting where emergency CS and blood transfusion are available. * **Steroids:** Administer corticosteroids (Betamethasone/Dexamethasone) between 24–34 weeks to accelerate fetal lung maturity. * **Vaginal Examination:** Strictly contraindicated in suspected placenta previa (the "Stallworthy's sign" or warning hemorrhage) as it can provoke torrential bleeding. Only a "Double Setup" examination in the OT is permitted if necessary.
Question 122: A 30-year-old G3P2 patient presents at 20 weeks gestation with a history of two previous large babies (4.6 kg and 4.8 kg, both delivered via cesarean section). She is suspected of having gestational diabetes and undergoes a glucose challenge test. Following a 50g oral glucose load, her blood sugar level is 206 mg/dL, confirming gestational diabetes. Which of the following is NOT a known complication of gestational diabetes?
- A. Increased susceptibility to infection
- B. Fetal hyperglycemia
- C. Congenital malformations in the fetus (Correct Answer)
- D. Neonatal hypoglycemia
Explanation: ### Explanation The key to answering this question lies in distinguishing between **Gestational Diabetes Mellitus (GDM)** and **Pregnancy with Pre-gestational (Pre-existing) Diabetes**. **1. Why "Congenital malformations" is the correct answer:** Congenital malformations (such as sacral agenesis or cardiac defects) occur during **organogenesis**, which takes place in the first 8 weeks of gestation. GDM, by definition, is glucose intolerance that develops or is first recognized in the **second or third trimester** (usually after 24 weeks). Since the metabolic derangement in GDM occurs after the organs have already formed, it does **not** increase the risk of structural congenital anomalies. These malformations are exclusively associated with poorly controlled pre-gestational diabetes. **2. Analysis of Incorrect Options:** * **A. Increased susceptibility to infection:** Hyperglycemia impairs leukocyte function and provides a medium for bacterial growth, increasing the risk of UTIs, monilial vulvovaginitis, and puerperal sepsis. * **B. Fetal hyperglycemia:** Maternal glucose crosses the placenta via facilitated diffusion. Therefore, maternal hyperglycemia directly leads to fetal hyperglycemia. * **D. Neonatal hypoglycemia:** Chronic fetal hyperglycemia leads to **fetal hyperinsulinism**. After birth, the maternal glucose supply is cut off, but the high circulating levels of fetal insulin persist, causing a rapid drop in the neonate's blood sugar. **Clinical Pearls for NEET-PG:** * **Sacral Agenesis (Caudal Regression Syndrome):** The most specific malformation associated with pre-gestational diabetes. * **Most common malformation:** Cardiac anomalies (specifically VSD and Transposition of Great Arteries). * **Diagnosis of GDM:** A 50g GCT value $\geq$ 200 mg/dL is diagnostic of GDM (as per DIPSI/IADPSG criteria). * **Macrosomia:** Defined as birth weight > 4 kg or > 4.5 kg; it is a hallmark complication of GDM due to the growth-promoting effects of fetal insulin.
Question 123: Post-term pregnancy is defined as a pregnancy which continues beyond:
- A. 274 days
- B. 284 days
- C. 294 days (Correct Answer)
- D. 304 days
Explanation: **Explanation:** The definition of pregnancy duration is based on the **Last Menstrual Period (LMP)**. According to the WHO and FIGO, a **Post-term pregnancy** is defined as a pregnancy that extends to or beyond **42 completed weeks** (294 days) from the first day of the LMP. * **Why 294 days is correct:** A standard pregnancy lasts 40 weeks (280 days). Post-term is defined as 42 weeks. Calculation: $42 \text{ weeks} \times 7 \text{ days} = 294 \text{ days}$. **Analysis of Incorrect Options:** * **A. 274 days:** This is approximately 39 weeks. This is considered "Full Term" (39w 0d to 40w 6d) but not post-term. * **B. 284 days:** This is 40 weeks and 4 days. This falls under the category of "Late Term" (41w 0d to 41w 6d) but has not yet reached the 42-week threshold for post-term. * **D. 304 days:** This is well beyond 43 weeks. While this is post-term, it does not represent the clinical threshold/definition point. **High-Yield Clinical Pearls for NEET-PG:** 1. **Terminology Check:** * **Term:** 37w 0d to 41w 6d. * **Late-term:** 41w 0d to 41w 6d. * **Post-term:** $\geq$ 42w 0d. 2. **Most Common Cause:** Inaccurate dating (wrong LMP). 3. **Etiology:** Often associated with placental sulfatase deficiency, fetal anencephaly, or extrauterine pregnancy. 4. **Risks:** Increased risk of **Macrosomia**, **Meconium Aspiration Syndrome**, and **Oligohydramnios** (Amniotic Fluid Index < 5cm). 5. **Management:** Induction of labor is generally recommended between 41 and 42 weeks to prevent perinatal morbidity.
Question 124: A 34-year-old patient in her second trimester of pregnancy presents for an antenatal ultrasound. Her beta-hCG levels are elevated, and her AFP levels are decreased. She has a 5-year-old child with no history of chromosomal abnormalities. What is the most likely diagnosis?
- A. Down syndrome (Correct Answer)
- B. Patau syndrome
- C. Edward syndrome
- D. Trisomy 16
Explanation: This question tests the ability to interpret the **Triple Marker Screen**, a crucial prenatal screening tool performed between 15–20 weeks of gestation. ### **Explanation of the Correct Answer** In **Down Syndrome (Trisomy 21)**, the characteristic biochemical profile includes: * **Elevated Beta-hCG:** Due to abnormal placental development. * **Decreased Alpha-fetoprotein (AFP):** Produced by the fetal liver; levels are typically lower in Trisomy 21. * **Decreased Unconjugated Estriol (uE3):** (Though not mentioned in the stem, this is the third component of the triple screen). * **Elevated Inhibin A:** (Added in the Quadruple screen). The combination of **High hCG** and **Low AFP** is the classic "high-yield" pattern for Down Syndrome on the NEET-PG exam. ### **Analysis of Incorrect Options** * **B. Patau Syndrome (Trisomy 13):** Usually presents with normal or slightly decreased AFP and hCG. It is more commonly identified via ultrasound (holoprosencephaly, polydactyly) rather than biochemical screening. * **C. Edward Syndrome (Trisomy 18):** Characterized by a "universal decrease." **All markers** (AFP, hCG, and uE3) are **decreased**. This is the primary differentiator from Down Syndrome. * **D. Trisomy 16:** This is the most common chromosomal cause of spontaneous miscarriages but rarely progresses to the second trimester for screening. ### **Clinical Pearls for NEET-PG** * **Mnemonic for Down Syndrome:** "**HI**gh" = **H**CG and **I**nhibin A are elevated. The rest (AFP, uE3) are low. * **AFP Interpretation:** Elevated AFP is associated with Neural Tube Defects (NTDs), abdominal wall defects (omphalocele/gastroschisis), and multiple gestations. * **Best Screening Time:** Triple/Quadruple markers are best performed at **16–18 weeks**. * **Combined Test (1st Trimester):** Includes Nuchal Translucency (NT), PAPP-A (low), and hCG (high).
Question 125: Prophylactic screening for Group B streptococcal infection in pregnancy is performed during which gestational period?
- A. All cases
- B. All cases between 23-27 weeks of gestation
- C. All cases between 35-37 weeks of gestation (Correct Answer)
- D. All cases of vaginitis
Explanation: **Explanation:** **Group B Streptococcus (GBS)**, or *Streptococcus agalactiae*, is a leading cause of neonatal sepsis, pneumonia, and meningitis. The rationale for screening is to identify colonized mothers and administer **Intrapartum Antibiotic Prophylaxis (IAP)** to prevent vertical transmission during labor. 1. **Why Option C is correct:** According to ACOG and CDC guidelines, universal screening is performed between **35 0/7 and 37 6/7 weeks** of gestation. This timing is critical because the predictive value of a GBS culture is highest for the 5-week window following the test. Since most women deliver near term, screening at this stage ensures the results are valid at the time of labor. 2. **Why other options are incorrect:** * **Option A:** Screening is universal, but the "period" must be specified to ensure accuracy. * **Option B:** Screening at 23-27 weeks is too early; GBS colonization is transient, and a woman may recolonize by the time she reaches term. * **Option D:** GBS is often asymptomatic colonization, not just associated with symptomatic vaginitis. Screening is required regardless of symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Specimen Collection:** A single swab is used to sample the **lower vagina** followed by the **rectum** (through the anal sphincter). * **Drug of Choice:** **Injectable Penicillin G** is the gold standard for IAP. Ampicillin is an alternative. * **Exceptions to Screening:** Screening is **not required** if: 1. GBS was detected in urine (GBS bacteriuria) at any time during the current pregnancy. 2. The mother previously gave birth to an infant with invasive GBS disease. *In these cases, IAP is administered empirically.*
Question 126: A patient presents with a missed menstrual period of 4 weeks and denies common early pregnancy symptoms like nausea, fatigue, urinary frequency, or breast tenderness. She is anxious about a potential pregnancy due to a history of ectopic pregnancy and desires early prenatal care. Which of the following evaluation methods is most sensitive in diagnosing pregnancy?
- A. No evaluation is needed as the patient is asymptomatic.
- B. Serum pregnancy test (Correct Answer)
- C. Detection of fetal heart tones by Doppler equipment
- D. Abdominal ultrasound
Explanation: **Explanation:** The diagnosis of pregnancy is primarily based on the detection of **human chorionic gonadotropin (hCG)**, a hormone produced by the syncytiotrophoblast. **Why Option B is correct:** The **serum pregnancy test** (specifically the β-hCG radioimmunoassay) is the most sensitive method for diagnosing pregnancy. It can detect hCG levels as low as **2–5 mIU/mL**, making it positive approximately **8–11 days after conception** (even before a missed period). In this patient, who is at high risk due to a history of ectopic pregnancy, early biochemical confirmation is vital for initiating serial monitoring. **Why other options are incorrect:** * **Option A:** Clinical symptoms (nausea, breast tenderness) are subjective and often absent in early pregnancy. A history of ectopic pregnancy necessitates immediate evaluation to confirm the pregnancy's location. * **Option C:** Fetal heart tones via Doppler are typically detectable only after **10–12 weeks** of gestation, making it an insensitive tool for early diagnosis. * **Option D:** While ultrasound is the gold standard for confirming the *location* and *viability* of a pregnancy, it is less sensitive than serum hCG for the initial *diagnosis*. A gestational sac is usually not visible on abdominal ultrasound until hCG levels reach **6,500 mIU/mL** (approx. 6 weeks), whereas transvaginal ultrasound (TVS) requires levels of **1,500–2,000 mIU/mL** (the "discriminatory zone"). **Clinical Pearls for NEET-PG:** * **Discriminatory Zone:** The hCG level at which a gestational sac should be visible on TVS (1,500–2,000 mIU/mL). If hCG is above this and the uterus is empty, suspect **Ectopic Pregnancy**. * **hCG Doubling Time:** In a healthy intrauterine pregnancy, serum β-hCG levels roughly double every **48 hours** during the first trimester. * **Urine Pregnancy Test:** Detects hCG at levels of 20–50 mIU/mL; it is best performed on the first morning void.
Question 127: What is the risk of Down's syndrome in women over 35 years of age?
- A. 1% - 2%
- B. 1% - 4% (Correct Answer)
- C. 2% - 4%
- D. 1% - 5%
Explanation: The risk of chromosomal abnormalities, particularly Down’s syndrome (Trisomy 21), increases significantly with advancing maternal age due to the aging of oocytes and the increased likelihood of meiotic non-disjunction. **Explanation of the Correct Answer:** In women aged 35 and older (Advanced Maternal Age), the risk of Down’s syndrome is generally cited between **1% and 4%**. While the age-specific risk at exactly 35 is approximately 1 in 385 (0.26%), the cumulative risk for women in the "over 35" cohort increases exponentially. By age 40, the risk is 1 in 100 (1%), and by age 45, it rises to 1 in 30 (3.3%). Therefore, the range of 1% to 4% accurately captures the clinical risk profile for this specific demographic in a testing context. **Analysis of Incorrect Options:** * **A (1% - 2%):** This range is too narrow and underestimates the risk for women in their early 40s. * **C (2% - 4%):** This overestimates the starting risk for a 35-year-old, who still has a relatively lower baseline risk compared to a 42-year-old. * **D (1% - 5%):** While the risk continues to rise, 5% is typically seen only in women nearing age 48-50; 4% is the standard upper limit for most clinical board questions regarding this age group. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Non-disjunction during Meiosis I (maternal origin in 95% of cases). * **Screening:** The **Combined Test** (PAPP-A, hCG, and Nuchal Translucency) is performed between 11–13+6 weeks. * **Quadruple Marker:** Performed between 15–20 weeks; shows **Low AFP, Low Estriol, High hCG, and High Inhibin-A** (Mnemonic: HIgh = hCG and Inhibin). * **Definitive Diagnosis:** Amniocentesis or Chorionic Villus Sampling (CVS).
Question 128: A pregnant lady in her first trimester presents with vaginal bleeding. On examination the os is closed and uterine size corresponds to the period of amenorrhoea. What is the most likely condition?
- A. Septic abortion
- B. Complete abortion
- C. Inevitable abortion
- D. Threatened abortion (Correct Answer)
Explanation: **Explanation:** The clinical presentation of vaginal bleeding in the first trimester with a **closed cervical os** and a **uterine size corresponding to the period of amenorrhea** is the classic triad for **Threatened Abortion**. In this condition, the pregnancy is potentially viable, but there is intrauterine bleeding. **Why the other options are incorrect:** * **Inevitable Abortion:** While bleeding occurs, the hallmark is a **dilated (open) cervical os** with or without rupture of membranes. The products of conception are still inside, but miscarriage cannot be stopped. * **Complete Abortion:** In this case, the cervical os is usually closed, but the **uterine size is smaller** than the period of gestation because all products of conception have been expelled. Bleeding and pain have typically subsided. * **Septic Abortion:** This is defined by any type of abortion complicated by **infection**. It presents with fever, foul-smelling vaginal discharge, and uterine tenderness, which are absent in this scenario. **High-Yield Clinical Pearls for NEET-PG:** * **Management of Threatened Abortion:** The mainstay is **bed rest** (though evidence is limited) and **progesterone supplementation** (to support the corpus luteum). * **Investigation of Choice:** Transvaginal Ultrasound (TVUS) is the gold standard to confirm fetal cardiac activity. * **Prognosis:** If fetal heart activity is documented on USG, over 90% of threatened abortions will proceed to a successful term pregnancy. * **Differential Diagnosis:** Always rule out Ectopic Pregnancy in first-trimester bleeding using USG and serial β-hCG levels.
Question 129: At what level of beta-hCG can a normal pregnancy be earliest detected by transvaginal ultrasonography (TVS)?
- A. 500 IU/ml
- B. 1000 IU/ml (Correct Answer)
- C. 1500 IU/ml
- D. 2000 IU/ml
Explanation: ### Explanation The correct answer is **1000 IU/ml**. This question refers to the **Discriminatory Zone**, which is the threshold level of serum beta-hCG at which a normal intrauterine gestational sac should be consistently visible via ultrasonography. **1. Why 1000 IU/ml is correct:** In modern clinical practice using high-resolution **Transvaginal Sonography (TVS)**, the gestational sac (the first sign of pregnancy) typically becomes visible when beta-hCG levels reach **1000–1500 IU/ml**. While some guidelines (like ACOG) use a more conservative threshold of 1500–2000 IU/ml to avoid misdiagnosing a viable pregnancy, 1000 IU/ml is recognized as the **earliest** level at which a sac can be detected by TVS in a normal pregnancy. **2. Why the other options are incorrect:** * **500 IU/ml:** This level is too low for reliable visualization. At this stage, the pregnancy is usually in the "pre-clinical" phase of imaging. * **1500 IU/ml & 2000 IU/ml:** While these are safer "discriminatory levels" used to rule out ectopic pregnancy (i.e., if the sac is not seen at 2000 IU/ml, the risk of ectopic or non-viable pregnancy is high), they do not represent the *earliest* point of detection. **3. High-Yield Clinical Pearls for NEET-PG:** * **TVS vs. TAS:** The discriminatory zone for **Transabdominal Sonography (TAS)** is higher, typically **6000–6500 IU/ml**. * **First Sign:** The **Gestational Sac** is the first sign of pregnancy on USG (at ~4.5–5 weeks). * **Yolk Sac:** Appears when the mean sac diameter is >8 mm or beta-hCG is ~7,200 IU/ml. * **Cardiac Activity:** Should be visible via TVS when the Crown-Rump Length (CRL) is **≥7 mm** or beta-hCG is >10,000 IU/ml. * **Doubling Time:** In a healthy early pregnancy, beta-hCG levels roughly double every 48 hours.
Question 130: Antenatal diagnosis of all of the following disorders is possible EXCEPT:
- A. Down's syndrome
- B. Noonan's syndrome
- C. Anencephaly
- D. Severe combined immunodeficiency syndrome (Correct Answer)
Explanation: **Explanation:** The correct answer is **Severe Combined Immunodeficiency Syndrome (SCID)**. While prenatal diagnosis is technically possible for SCID via DNA analysis of chorionic villi or amniocytes (if the specific genetic mutation is known), it is **not** part of routine antenatal screening or standard diagnostic protocols. In the context of standard NEET-PG questions, SCID is typically identified postnatally through newborn screening (TREC assays) or clinical presentation of recurrent infections. **Analysis of Options:** * **Down’s Syndrome (Trisomy 21):** This is the most common chromosomal anomaly screened for antenatally. Diagnosis is made via **Karyotyping** or **FISH** following invasive procedures like Chorionic Villus Sampling (CVS) or Amniocentesis, often preceded by screening (Combined test/Quadruple marker). * **Anencephaly:** This is a neural tube defect (NTD) that can be diagnosed with nearly 100% sensitivity via **Targeted Ultrasound (Level II scan)** at 18–20 weeks. Elevated maternal serum Alpha-fetoprotein (MSAFP) also serves as a biochemical marker. * **Noonan’s Syndrome:** This is an autosomal dominant condition (often PTPN11 mutation). It can be suspected antenatally if ultrasound shows **increased nuchal translucency (NT)** or cystic hygroma with a normal karyotype. Definitive diagnosis is possible via molecular genetic testing of fetal cells. **Clinical Pearls for NEET-PG:** * **Best time for NT scan:** 11 to 13+6 weeks. * **Most sensitive marker for Down’s:** Increased Nuchal Translucency. * **Lemon sign and Banana sign:** Ultrasound markers associated with Spina Bifida (NTDs), not anencephaly. * **SCID:** Characterized by the absence of T-cells and B-cells; the most common form is X-linked (IL2RG mutation).
Practice by Chapter
Preconception Counseling
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Pregnancy Diagnosis and Dating
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Routine Antenatal Assessments
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Maternal Physiological Changes
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Nutrition in Pregnancy
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Screening Tests in Pregnancy
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Fetal Growth Assessment
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High-Risk Pregnancy Identification
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Antenatal Complications Management
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Psychosocial Aspects of Pregnancy
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