Prenatal Care — MCQs

Prenatal Care Indian Medical PG Practice Questions and MCQs

Question 161: A 22-year-old female on antiepileptic therapy got married. When should folic acid supplementation be advised to this female?

A. 3 months before pregnancy
B. All women who could become pregnant (Correct Answer)
C. As soon as pregnancy is confirmed
D. After delivery

Explanation: **Explanation:** The primary goal of folic acid supplementation is the prevention of **Neural Tube Defects (NTDs)**, such as spina bifida and anencephaly. The neural tube closes by the **28th day of gestation** (often before a woman even realizes she is pregnant). Therefore, for supplementation to be effective, it must be present in the system at the time of conception and during the very early stages of organogenesis. **Why Option B is Correct:** Current clinical guidelines (WHO and ACOG) recommend that **all women of reproductive age who could become pregnant** should take folic acid. This is because nearly 50% of pregnancies are unplanned. In this specific case, the patient is on **antiepileptic drugs (AEDs)**, many of which (like Valproate or Carbamazepine) are folate antagonists and significantly increase the risk of NTDs. **Why Other Options are Incorrect:** * **Option A:** While starting 3 months prior is ideal for planned pregnancies, the recommendation "all women who could become pregnant" is more comprehensive and covers the risk of unplanned conception. * **Option C:** By the time pregnancy is confirmed (usually 5–6 weeks), the neural tube has already closed. Supplementation at this stage is too late to prevent NTDs. * **Option D:** Folic acid is required during the periconceptional period and pregnancy; starting after delivery serves no preventive purpose for the fetus. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Dose:** 400 mcg (0.4 mg) daily for low-risk women. * **High-Risk Dose:** **4 mg (4000 mcg)** daily for women on AEDs or those with a previous history of a child with NTD. * **Timing:** Ideally started at least 1–3 months before conception and continued until the end of the first trimester (12 weeks).

Question 162: Low MSAFP is seen in all of the following except?

A. Neural tube defect (Correct Answer)
B. Trisomy 21
C. Skeletal deformity
D. Cardiac anomaly

Explanation: **Explanation:** The core concept behind **Maternal Serum Alpha-Fetoprotein (MSAFP)** levels is the integrity of the fetal skin and body wall. AFP is produced by the fetal yolk sac and liver; it enters the amniotic fluid via fetal urine and crosses into the maternal circulation. **1. Why "Neural Tube Defect" is the correct answer:** In **Neural Tube Defects (NTDs)**, such as anencephaly or spina bifida, there is an open defect in the fetal skin/spine. This allows AFP to leak directly from the fetal circulation/cerebrospinal fluid into the amniotic fluid, leading to **elevated (high) MSAFP** levels. Since the question asks which condition does *not* cause low MSAFP, NTDs are the correct choice. **2. Analysis of incorrect options (Conditions with Low MSAFP):** * **Trisomy 21 (Down Syndrome):** Characteristically associated with **low MSAFP**, low Estriol (uE3), and high hCG/Inhibin-A (the "Quadruple Screen" pattern). * **Skeletal Deformities & Cardiac Anomalies:** These conditions, along with Trisomy 18 and molar pregnancies, are frequently associated with decreased production or transport of AFP, resulting in **low MSAFP** levels. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of elevated MSAFP:** Underestimation of gestational age (wrong dates). * **Other causes of High MSAFP:** Multiple gestations, Omphalocele, Gastroschisis, and Pilonidal cysts. * **Other causes of Low MSAFP:** Maternal obesity, Diabetes mellitus, and Trisomy 18 (Edwards Syndrome). * **Rule of Thumb:** "Open" defects (leaks) = High AFP; Chromosomal/Internal anomalies = Low AFP.

Question 163: What is the role of a Pap smear in pregnancy?

A. Contraindicated
B. Not useful
C. Routine, as part of screening (Correct Answer)
D. Done in every patient

Explanation: **Explanation:** The correct answer is **C. Routine, as part of screening.** In prenatal care, pregnancy is viewed as an opportunity to provide comprehensive healthcare to women who may not otherwise seek regular medical attention. A Pap smear is performed during the first prenatal visit if the patient is due for cervical cancer screening based on standard age-specific guidelines (e.g., ACOG/ASCCP guidelines). Pregnancy does not change the indications for screening, nor does it interfere with the accuracy of the results. **Analysis of Options:** * **A. Contraindicated:** This is incorrect. A Pap smear is safe during pregnancy. While it may cause minor spotting due to increased cervical vascularity (decidualization), it does not increase the risk of miscarriage or preterm labor. * **B. Not useful:** This is incorrect. Cervical cancer can coexist with pregnancy. Early detection is vital for maternal health and determining the mode of delivery or timing of intervention. * **D. Done in every patient:** This is incorrect. It is not mandatory for *every* pregnant woman. It is only performed if the patient is due for her routine screening or has never been screened. **High-Yield Clinical Pearls for NEET-PG:** * **Technique:** An Ayre’s spatula and cytobrush can be used, but the brush should be inserted gently to avoid bleeding. * **Management of Abnormal Results:** If a Pap smear shows HSIL (High-grade Squamous Intraepithelial Lesion), **colposcopy** is indicated during pregnancy. However, **endocervical curettage (ECC)** is strictly **contraindicated** in pregnant women. * **Biopsy:** Cervical biopsy is only performed during pregnancy if malignancy is strongly suspected. Treatment for pre-invasive lesions (CIN) is typically deferred until 6–12 weeks postpartum.

Question 164: A woman undergoes chorionic villous sampling at 11 weeks gestation. The result shows two cell lines: 46, XY and 47, XY, +21. What is your next step?

A. Repeat CVS at 13 weeks gestation
B. No further evaluation needed
C. Perform amniocentesis for further confirmation (Correct Answer)
D. Diagnose Down syndrome and counsel the couple

Explanation: **Explanation:** The presence of two different cell lines (one normal and one aneuploid) in a Chorionic Villus Sampling (CVS) specimen is known as **Confined Placental Mosaicism (CPM)**. This occurs in approximately 1–2% of CVS procedures. Because CVS samples the trophoblastic tissue (placenta) rather than the fetus itself, the mosaicism may be restricted to the placenta while the fetus remains euploid. **Why Option C is Correct:** To differentiate between CPM and true fetal mosaicism, a definitive test that samples fetal cells is required. **Amniocentesis** (typically performed after 15 weeks) is the gold standard in this scenario. Amniocytes are derived from the fetus (skin, respiratory, and urinary tracts), providing a more accurate representation of the fetal karyotype than placental villi. **Why Other Options are Incorrect:** * **Option A:** Repeating CVS would likely yield the same placental results and does not resolve the diagnostic dilemma of whether the fetus is affected. * **Option B:** Ignoring the result is negligent, as there is still a significant risk that the fetus carries the trisomy 21 cell line. * **Option D:** Diagnosing Down syndrome based solely on a mosaic CVS result may lead to the termination of a genetically normal fetus. A definitive diagnosis requires amniocentesis. **Clinical Pearls for NEET-PG:** * **CVS Timing:** 10–13 weeks. It cannot detect Neural Tube Defects (NTDs) as it doesn't measure AFP. * **Amniocentesis Timing:** 15–20 weeks. * **Confined Placental Mosaicism (CPM):** Always consider this when CVS shows mosaicism but the ultrasound is normal. * **Risk of miscarriage:** CVS (~0.5–1%) is slightly higher than or equal to mid-trimester amniocentesis (~0.1–0.5%).

Question 165: All of the following are commonly used for estimation of gestational age in mid-trimester EXCEPT?

A. Biparietal diameter
B. Crown Rump Length (Correct Answer)
C. Abdominal circumference of fetus
D. Femur length

Explanation: **Explanation:** The estimation of gestational age (GA) via ultrasonography relies on different parameters depending on the trimester of pregnancy. **Why Crown Rump Length (CRL) is the correct answer:** CRL is the measurement of the length of the embryo or fetus from the top of the head (crown) to the bottom of the buttocks (rump). It is the **most accurate parameter** for dating a pregnancy, but its utility is strictly limited to the **first trimester** (up to 13 weeks and 6 days). After 14 weeks (mid-trimester), the fetus begins to curl and stretch, making CRL measurements inconsistent and inaccurate. Therefore, it is not used in the mid-trimester. **Analysis of incorrect options (Mid-trimester parameters):** In the second trimester (14–28 weeks), a combination of biometric parameters is used to calculate GA: * **Biparietal Diameter (BPD):** Measured at the level of the thalami and cavum septum pellucidum. It is very reliable in the second trimester. * **Femur Length (FL):** The most reliable long bone measurement for GA; it correlates well with BPD. * **Abdominal Circumference (AC):** While primarily used to monitor fetal growth and weight, it is still a standard component of the biometric profile used to estimate GA in the mid-trimester. **High-Yield NEET-PG Pearls:** * **Most accurate overall:** CRL in the 1st trimester (accuracy ± 3–5 days). * **Best time for CRL:** 7 to 12 weeks. * **Mid-trimester accuracy:** Accuracy decreases to ± 7–10 days. * **Late pregnancy:** In the 3rd trimester, USG is least accurate for dating (± 3 weeks). * **Transvaginal Sonography (TVS):** Can detect a gestational sac as early as 4.5–5 weeks.

Question 166: In Down's syndrome, what are the typical serum markers and nuchal translucency (NT) findings?

A. Increased MSAFP and UE3, Decreased PAPP-A and hCG, NT < 3mm
B. Decreased MSAFP, PAPP-A and UE3 and Increased hCG, NT > 3mm (Correct Answer)
C. Decreased MSAFP, PAPP-A, UE3 and hCG, NT > 3mm
D. Increased MSAFP, UE3, PAPP-A and hCG, NT < 3mm

Explanation: In Down’s syndrome (Trisomy 21), the biochemical profile is characterized by a "High-Low" pattern. The correct answer is **B** because it reflects the classic markers used in first and second-trimester screening. ### **Medical Concept** * **First Trimester (11–13.6 weeks):** Screening relies on **PAPP-A** (Pregnancy-associated plasma protein A) and **Nuchal Translucency (NT)**. In Trisomy 21, PAPP-A is **decreased**, while the NT is **increased** (>3 mm), representing subcutaneous fluid collection at the back of the fetal neck. * **Second Trimester (15–20 weeks):** The "Quadruple test" shows **decreased MSAFP** (Maternal Serum Alpha-fetoprotein) and **decreased UE3** (Unconjugated Estriol), but **increased hCG** and **Inhibin-A**. The mnemonic **"HI"** (hCG and Inhibin) are **High** in Down’s syndrome. ### **Analysis of Incorrect Options** * **Option A & D:** Incorrect because MSAFP and UE3 are characteristically **decreased** in Down’s syndrome. Increased MSAFP is associated with Neural Tube Defects (NTD) or abdominal wall defects. * **Option C:** Incorrect because **hCG is elevated** in Down’s syndrome. A decrease in all markers (MSAFP, UE3, and hCG) is typically seen in **Trisomy 18 (Edwards Syndrome)**. ### **NEET-PG High-Yield Pearls** * **Most sensitive single marker:** NT (Nuchal Translucency). * **Most sensitive biochemical marker (2nd Trimester):** Inhibin-A. * **Trisomy 18 (Edwards):** All markers (hCG, AFP, UE3) are **decreased**. * **Trisomy 13 (Patau):** PAPP-A and hCG are decreased; MSAFP is usually normal. * **Combined Test:** NT + PAPP-A + hCG (Detection rate ~85-90%).

Question 167: Alpha-fetoprotein levels are increased in all of the following conditions except:

A. Chromosomal trisomy (Correct Answer)
B. Cloacal exstrophy
C. Exomphalos
D. Tracheoesophageal fistula

Explanation: **Explanation:** Alpha-fetoprotein (AFP) is a glycoprotein produced initially by the yolk sac and later by the fetal liver. It is a crucial biomarker in prenatal screening, typically measured between 15–20 weeks of gestation. **Why Chromosomal Trisomy is the Correct Answer:** In pregnancies affected by **Chromosomal Trisomies** (specifically Down Syndrome/Trisomy 21 and Edwards Syndrome/Trisomy 18), maternal serum AFP (MSAFP) levels are characteristically **decreased**, not increased. In Down Syndrome, the "Triple Test" typically shows low AFP, low unconjugated estriol (uE3), and high hCG. **Why the other options are incorrect (Conditions with Increased AFP):** AFP levels increase whenever there is a defect in the fetal barrier (skin or epithelium) that allows the protein to leak into the amniotic fluid and maternal circulation. * **Exomphalos (Omphalocele) & Cloacal Exstrophy:** These are ventral wall defects. The absence of integumentary coverage over the abdominal viscera allows massive leakage of AFP. * **Tracheoesophageal Fistula (TEF):** Any gastrointestinal obstruction or fistula interferes with the fetal swallowing and digestion of amniotic fluid (which contains AFP), leading to elevated levels in the amniotic sac and maternal serum. **NEET-PG High-Yield Pearls:** * **Most common cause of increased MSAFP:** Incorrect gestational age estimation (dating error). * **Other causes of increased AFP:** Neural tube defects (Anencephaly, Spina bifida), Multiple gestations, Renal anomalies (Finnish-type nephrosis), and Fetal demise. * **Mnemonic for Low AFP:** "**D**own **E**very **A**nd **P**eaceful" (**D**own syndrome, **E**dwards syndrome, **A**bnormal pregnancy/Molar, **P**aternal obesity).

Question 168: What is the primary purpose of a Level II scan performed between 18-20 weeks of gestation?

A. Diagnosis of fetal anomaly (Correct Answer)
B. Assessment of lung maturity
C. Sex determination
D. Assessment of Amniotic Fluid Index (AFI)

Explanation: **Explanation:** The **Level II scan**, also known as the **Anomaly Scan** or Mid-trimester Morphology Scan, is a critical screening tool performed between 18–20 weeks of gestation. This timing is ideal because the fetal organs are sufficiently developed for detailed visualization, and the volume of amniotic fluid is relatively high, providing an excellent acoustic window. **Why Option A is correct:** The primary objective is the systematic **anatomical survey** of the fetus to detect structural malformations (e.g., neural tube defects, cardiac anomalies, or cleft lip/palate). It also screens for "soft markers" (like nuchal fold thickness or echogenic intracardiac focus) that may indicate chromosomal abnormalities like Trisomy 21. **Why other options are incorrect:** * **Option B:** Fetal lung maturity is typically assessed in the third trimester (usually after 34 weeks) via amniocentesis (L/S ratio) or specialized ultrasound parameters, not at 18 weeks. * **Option C:** While the genitalia can often be seen, sex determination is **illegal** in India under the **PCPNDT Act** and is never the medical "primary purpose" of a scan. * **Option D:** While AFI is measured during this scan, it is a secondary observation. Dedicated AFI monitoring is more clinically significant in the third trimester to assess placental function and fetal well-being. **High-Yield NEET-PG Pearls:** * **Optimal Timing:** 18–20 weeks (can be done up to 22 weeks). * **Legal Limit:** In India, the MTP Act allows termination of pregnancy up to **24 weeks** for substantial fetal abnormalities, making the 18–20 week window crucial for decision-making. * **Soft Markers:** Presence of ≥2 soft markers significantly increases the risk of aneuploidy and warrants further genetic counseling/testing.

Question 169: What is the normal weight gain during pregnancy?

A. 1 to 3 kg
B. 5 to 7 kg
C. 10 to 12 kg (Correct Answer)
D. 12 to 15 kg

Explanation: The average weight gain during a healthy pregnancy for a woman with a normal pre-pregnancy BMI (18.5–24.9 kg/m²) is approximately **11 kg (range 10–12 kg)**. This weight gain is distributed between the products of conception (fetus, placenta, liquor) and maternal physiological changes (increased blood volume, breast tissue, and fat stores). ### **Detailed Breakdown of Options:** * **Option C (10–12 kg):** This is the standard physiological weight gain. It typically follows a pattern: ~1 kg in the first trimester, and ~5 kg each in the second and third trimesters (roughly 0.4 kg/week in the latter half). * **Options A & B (1–7 kg):** These values represent inadequate weight gain. This is often associated with Intrauterine Growth Restriction (IUGR), preterm birth, and maternal malnutrition. * **Option D (12–15 kg):** While the IOM (Institute of Medicine) guidelines suggest up to 11.5–16 kg for normal BMI women, standard textbooks like Williams and Dutta, which are primary sources for NEET-PG, traditionally emphasize the **11 kg** mark as the physiological norm. ### **High-Yield Clinical Pearls for NEET-PG:** * **Distribution of Weight:** Fetus (~3.3 kg), Placenta (0.6 kg), Amniotic fluid (0.8 kg), Uterus & Breasts (1.2 kg), Blood & ECF (2.5 kg), and Maternal Fat/Protein stores (3.5 kg). * **BMI-Based Recommendations:** * **Underweight (<18.5):** 12.5–18 kg * **Overweight (25–29.9):** 7–11.5 kg * **Obese (>30):** 5–9 kg * **Red Flag:** A sudden weight gain of >0.5 kg/week or >2 kg in a month is a classic early sign of **Pre-eclampsia** due to fluid retention (occult edema).

Question 170: Which of the following first-trimester obstetrical signs is FALSE?

A. Chadwick's sign is regular rhythmic uterine contraction seen as early as 4-6 weeks of pregnancy. (Correct Answer)
B. Goodell's sign is a soft cervix seen as early as 6 weeks.
C. Osiander's sign is pulsation in the lateral vaginal fornix seen as early as 8 weeks.
D. Hegar's sign is a reliable sign seen as early as 6-10 weeks.

Explanation: The correct answer is **A** because the description provided for Chadwick’s sign is incorrect. **Chadwick’s sign** is actually a bluish discoloration of the cervix, vagina, and labia caused by increased vascularity (venous congestion), typically appearing around 6–8 weeks. The description of "regular rhythmic uterine contractions" actually refers to **Palmer’s sign**, which can be felt during a bimanual examination as early as 4–8 weeks. ### Explanation of Other Options: * **Goodell’s sign (Option B):** This refers to the significant softening of the cervix due to increased vascularity and edema. In a non-pregnant state, the cervix feels like the tip of the nose; in pregnancy, it feels like the lips. This is a correct clinical finding at 6 weeks. * **Osiander’s sign (Option C):** This is the perception of increased pulsations in the lateral vaginal fornices due to the enlargement and increased blood flow of the uterine arteries. It is correctly noted at approximately 8 weeks. * **Hegar’s sign (Option D):** This is a classic sign where the lower uterine segment (isthmus) becomes very soft, allowing the fingers of the internal and external hands to almost meet during bimanual palpation. It is a reliable sign appearing between 6–10 weeks. ### High-Yield Clinical Pearls for NEET-PG: * **Jacquemier’s Sign:** Another name for Chadwick’s sign (bluish discoloration of the vestibule/anterior vaginal wall). * **Piskacek’s Sign:** Asymmetrical enlargement of the uterus if implantation occurs near one of the cornua. * **Ladins Sign:** Softening of the uterus in the anterior midline at the junction of the uterus and cervix (6 weeks). * **Von Fernwald's Sign:** Irregular softening of the fundus over the site of implantation.

Practice by Chapter

Preconception Counseling

Practice Questions

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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