Prenatal Care — MCQs

A pregnant woman presents for prenatal care. Her past medical history is significant for a severe illness 3 years ago characterized by fatigue, nausea, anorexia, vomiting, jaundice, joint pains, and generalized skin lesions that slowly disappeared. She has felt well recently. Which lab test should be ordered to investigate the patient's past illness?

Q378Medium

A 28-year-old pregnant woman with no known medical conditions presents for her first prenatal visit. Her fasting blood glucose level is 144 mg/dL and she has 3+ glycosuria. How do you counsel her regarding the risk of fetal anomalies?

Q379Easy

What does Chadwick sign indicate?

Q380Easy

What is the daily extra calorie requirement during the first trimester of pregnancy?

Prenatal Care Indian Medical PG Practice Questions and MCQs

Question 371: If a fetus has Down syndrome, what finding will NOT be shown on a quadruple marker screening test?

A. High hCG
B. Low Inhibin A (Correct Answer)
C. Low AFP
D. Low Estriol

Explanation: In the **Quadruple Marker Screening** (performed between 15–20 weeks of gestation), maternal serum levels of four specific substances are measured to assess the risk of chromosomal abnormalities, most notably Trisomy 21 (Down syndrome). ### Why "Low Inhibin A" is the Correct Answer In a pregnancy affected by **Down syndrome**, the level of **Inhibin A is characteristically elevated (High)**, not low. Inhibin A is produced by the placenta, and its elevation is a key marker used to increase the sensitivity of the screening test compared to the triple marker test. ### Analysis of Incorrect Options * **A. High hCG:** This is a **correct** finding in Down syndrome. Along with Inhibin A, hCG levels are typically increased (mnemonic: **HI**gh = **H**CG and **I**nhibin A). * **C. Low AFP:** Alpha-fetoprotein (AFP) is typically **decreased** in Down syndrome. (High AFP is associated with neural tube defects). * **D. Low Estriol (uE3):** Unconjugated estriol is typically **decreased** in Down syndrome due to altered steroidogenesis in the fetal-placental unit. ### NEET-PG High-Yield Pearls * **Mnemonic for Down Syndrome (Quad Test):** Remember **"HI"** is **High** (**H**CG and **I**nhibin A). The others (AFP and Estriol) are **Low**. * **Trisomy 18 (Edwards Syndrome):** All markers (AFP, uE3, and hCG) are typically **decreased**. Inhibin A is usually normal or decreased. * **Timing:** The Quad test is best performed between **15–18 weeks** (though valid up to 22 weeks). * **Combined Test (1st Trimester):** Uses Nuchal Translucency (NT), PAPP-A (Low), and hCG (High). Low PAPP-A is a significant marker for Trisomy 21 in the first trimester.

Question 372: Which test has the fastest lab processing time for karyotype assessment?

A. Amniocentesis
B. Cordocentesis
C. Chorionic villus sampling (CVS) (Correct Answer)
D. Doppler flow ultrasound

Explanation: **Explanation:** The speed of karyotype assessment depends on the availability of actively dividing cells. **Chorionic Villus Sampling (CVS)** is the correct answer because it allows for a **"Direct Preparation" (Short-term culture).** Since the cytotrophoblast cells in the chorionic villi are naturally and rapidly dividing, they can be harvested and arrested in metaphase almost immediately. This allows for a preliminary karyotype result within **24 to 48 hours**. **Analysis of Options:** * **Amniocentesis:** This procedure collects fetal desquamated cells (amniocytes) from the amniotic fluid. These cells have a low mitotic index and must be cultured for **10 to 14 days** before enough cells are available for chromosomal analysis. * **Cordocentesis (Percutaneous Umbilical Blood Sampling):** While fetal lymphocytes are used, they still require stimulation with mitogens (like phytohemagglutinin) and culture for approximately **48 to 72 hours**. While fast, CVS direct preparation remains the quickest. * **Doppler flow ultrasound:** This is a functional imaging modality used to assess fetal-placental circulation (e.g., Middle Cerebral Artery or Umbilical Artery flow). It cannot provide a karyotype. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** CVS is performed at **10–13 weeks** (earliest invasive test); Amniocentesis at **15–20 weeks**; Cordocentesis after **18 weeks**. * **Risk:** CVS has a slightly higher risk of fetal loss (~0.5–1%) compared to amniocentesis (~0.5%). * **Limb Reduction Defects:** If CVS is performed before 9–10 weeks, there is a specific risk of oromandibular-limb hypogenesis. * **Confined Placental Mosaicism:** A known limitation of CVS where the placental karyotype does not match the fetal karyotype.

Question 373: Which of the following biochemical markers is useful in first-trimester screening for Down's syndrome?

A. Inhibin
B. Estradiol
C. PAPP-A (Correct Answer)
D. Acetylcholinesterase

Explanation: **Explanation:** First-trimester screening for Down syndrome (Trisomy 21) is typically performed between **11 and 13+6 weeks** of gestation. The "Combined Test" includes maternal age, fetal nuchal translucency (NT) via ultrasound, and two biochemical markers: **PAPP-A** (Pregnancy-Associated Plasma Protein-A) and **free β-hCG**. 1. **Why PAPP-A is correct:** In pregnancies affected by Down syndrome, maternal serum levels of **PAPP-A are significantly decreased**, while levels of free β-hCG are increased. PAPP-A is a metalloproteinase produced by the trophoblast; low levels indicate placental dysfunction associated with aneuploidy. **Analysis of Incorrect Options:** * **Inhibin A:** This is a marker used in the **Second-trimester Quadruple Screen** (15–20 weeks). It is elevated in Down syndrome. * **Estradiol:** Specifically, **Unconjugated Estriol (uE3)** is used in the second-trimester Triple or Quadruple screen. It is decreased in Down syndrome. (Note: Estradiol itself is not a standard screening marker). * **Acetylcholinesterase (AChE):** This is a highly specific marker used to confirm **Neural Tube Defects (NTDs)**. It is measured in amniotic fluid following an elevated maternal serum alpha-fetoprotein (MSAFP) result. **High-Yield Clinical Pearls for NEET-PG:** * **The "H-i" Rule:** In Down syndrome, only **H**CG and **I**nhibin-A are **High** (elevated) during second-trimester screening; all other markers (AFP, uE3, PAPP-A) are low. * **Best Time for NT:** 11 weeks to 13 weeks 6 days (CRL 45–84 mm). * **Integrated Screen:** Combines first-trimester (NT + PAPP-A) and second-trimester (Quadruple screen) results for the highest detection rate (~95%).

Question 374: Chorionic villus sampling is done for all the following indications EXCEPT?

A. Down syndrome
B. Trisomy 21
C. Phenylketonuria
D. Gastroschisis (Correct Answer)

Explanation: **Explanation:** The correct answer is **Gastroschisis**. **1. Why Gastroschisis is the correct answer:** Chorionic Villus Sampling (CVS) is a technique used to obtain fetal tissue for **genetic, metabolic, and DNA analysis**. Gastroschisis is a structural ventral wall defect, not a chromosomal or genetic disorder. Structural anomalies like gastroschisis or neural tube defects (NTDs) are diagnosed via **maternal serum alpha-fetoprotein (MSAFP) screening** and confirmed by **detailed ultrasonography**. CVS cannot detect structural defects because it analyzes the chromosomal makeup, not the physical anatomy or protein markers in the amniotic fluid. **2. Analysis of incorrect options:** * **Options A & B (Down Syndrome / Trisomy 21):** These are chromosomal aneuploidies. CVS allows for a full karyotype or FISH (Fluorescence In Situ Hybridization) to definitively diagnose Trisomy 21. * **Option C (Phenylketonuria):** This is an autosomal recessive metabolic disorder. Since the genetic mutation is present in every cell of the conceptus, DNA analysis of the chorionic villi can identify the specific metabolic mutation. **3. High-Yield Clinical Pearls for NEET-PG:** * **Timing:** CVS is typically performed between **10–13 weeks** of gestation (First Trimester). * **Advantage:** It provides earlier results compared to amniocentesis (15–20 weeks). * **Limitation:** It cannot detect Neural Tube Defects (NTDs). * **Complications:** The most specific risk associated with CVS performed before 9 weeks is **Limb Reduction Defects**. * **Confirmatory Test:** CVS is a diagnostic test, whereas the Combined Test (nuchal translucency + PAPP-A + hCG) is only a screening test.

Question 375: A 25-year-old lady presents with a pregnancy of 6 weeks. Which of the following is NOT a sign of early pregnancy?

A. Goodell's sign
B. Hegar's sign
C. Cullen's sign (Correct Answer)
D. Palmer's sign

Explanation: **Explanation:** The correct answer is **Cullen’s sign**. This question tests the ability to differentiate between physiological signs of early pregnancy and signs of pathological conditions like ruptured ectopic pregnancy. **1. Why Cullen’s Sign is the Correct Answer:** Cullen’s sign is defined as bluish discoloration or ecchymosis around the umbilicus. It is caused by the tracking of hemoperitoneum (blood in the peritoneal cavity) through the falciform ligament. While it can be seen in a **ruptured ectopic pregnancy**, it is not a physiological sign of a normal early pregnancy. It is also classically associated with acute hemorrhagic pancreatitis. **2. Analysis of Incorrect Options (Physiological Signs):** * **Goodell’s Sign (6–8 weeks):** Softening of the cervix due to increased vascularity and hypertrophy of the cervical glands. * **Hegar’s Sign (6–10 weeks):** Softening of the lower uterine segment (isthmus). On bimanual examination, the upper body of the uterus and the cervix seem like two separate regions because the isthmus is so soft it can be compressed almost paper-thin. * **Palmer’s Sign (4–8 weeks):** Regular, rhythmic, painless uterine contractions felt during a bimanual examination. **High-Yield Clinical Pearls for NEET-PG:** * **Chadwick’s Sign (6–8 weeks):** Bluish discoloration of the cervix, vagina, and labia due to venous congestion (also called Jacquemier’s sign). * **Osiander’s Sign (8 weeks):** Increased pulsations felt in the lateral vaginal fornices due to increased vascularity. * **Piskacek’s Sign:** Asymmetrical enlargement of the uterus if implantation occurs near one of the cornua. * **Ladins Sign (6 weeks):** Softening of the anterior midline of the uterus at the junction with the cervix.

Question 376: What is the approximate risk of Down syndrome for a pregnant woman aged 35 years?

A. 1 in 75
B. 1 in 100
C. 1 in 250 (Correct Answer)
D. 1 in 1000

Explanation: **Explanation:** The risk of chromosomal aneuploidies, specifically **Trisomy 21 (Down syndrome)**, increases significantly with advancing maternal age due to the increased incidence of meiotic non-disjunction in aging oocytes. **1. Why 1 in 250 is correct:** At the age of 35, a woman is considered to be of "advanced maternal age." Statistically, the risk of having a live-born infant with Down syndrome at age 35 is approximately **1 in 385**. However, the risk of Down syndrome **at the time of mid-trimester amniocentesis** (around 16 weeks) is approximately **1 in 250**. In the context of NEET-PG and standard textbooks like Williams Obstetrics, "1 in 250" is the classic benchmark used to define the threshold where the risk of the condition equals the procedural risk of invasive testing. **2. Analysis of incorrect options:** * **A (1 in 75):** This represents the risk for a woman aged approximately 45 years. * **B (1 in 100):** This is the approximate risk for a woman aged 40 years. * **D (1 in 1000):** This is the baseline risk for a much younger woman (approx. age 25–28). **High-Yield Clinical Pearls for NEET-PG:** * **The "35 Rule":** Age 35 is the traditional cutoff for offering invasive prenatal diagnosis because the risk of Down syndrome (1:250) was historically thought to outweigh the risk of miscarriage from amniocentesis. * **Most Common Cause:** Non-disjunction (95%), followed by Robertsonian translocation (4%) and Mosaicism (1%). * **Screening:** The **Quadruple Marker test** (AFP, hCG, uE3, Inhibin-A) is typically performed between 15–20 weeks. In Down syndrome: **hCG and Inhibin-A are HIGH**, while **AFP and uE3 are LOW**. * **Combined Test (1st Trimester):** Includes Nuchal Translucency (NT), PAPP-A (low), and free β-hCG (high).

Question 377: A pregnant woman presents for prenatal care. Her past medical history is significant for a severe illness 3 years ago characterized by fatigue, nausea, anorexia, vomiting, jaundice, joint pains, and generalized skin lesions that slowly disappeared. She has felt well recently. Which lab test should be ordered to investigate the patient's past illness?

A. Hepatitis B surface antigen (HBsAg) (Correct Answer)
B. IgG cytomegalovirus (CMV) antibody levels
C. IgM antibody to HBsAg
D. IgM antibody to hepatitis B core antigen

Explanation: **Explanation:** The patient’s history of jaundice, fatigue, joint pains, and skin lesions (likely Gianotti-Crosti syndrome or urticaria associated with the prodromal phase) strongly suggests a past episode of **Acute Hepatitis B**. In the context of prenatal care, the primary concern is the risk of **Vertical Transmission** (mother-to-child). **1. Why HBsAg is the correct answer:** Hepatitis B surface antigen (HBsAg) is the first serological marker to appear in an infection and the standard screening test in pregnancy. If the patient failed to clear the virus after her illness 3 years ago, she would be a **chronic carrier** (defined by HBsAg persistence for >6 months). Identifying HBsAg-positive status is crucial because it dictates the need for neonatal immunoprophylaxis (HBV vaccine + HBIG) to prevent chronic infection in the newborn. **2. Why the other options are incorrect:** * **IgG CMV antibody:** While CMV is a TORCH infection, the patient’s specific history of jaundice and joint pain is more characteristic of viral hepatitis than CMV. * **IgM antibody to HBsAg:** This is not a standard clinical marker. We measure antibodies *against* the surface antigen (Anti-HBs) to check for immunity, not IgM. * **IgM antibody to HBcAg:** This marker is a sign of **acute** infection or a flare-up. Since her illness occurred 3 years ago and she is currently asymptomatic, this would likely be negative. **Clinical Pearls for NEET-PG:** * **Vertical Transmission Risk:** If a mother is HBsAg positive and **HBeAg positive**, the risk of transmission to the neonate is **90%**. If she is HBeAg negative, the risk drops to about 10-20%. * **Management:** Infants born to HBsAg+ mothers must receive the **HBV vaccine and Hepatitis B Immunoglobulin (HBIG)** within 12 hours of birth. * **Universal Screening:** All pregnant women are screened for HBsAg at the first prenatal visit, regardless of prior testing or vaccination status.

Question 378: A 28-year-old pregnant woman with no known medical conditions presents for her first prenatal visit. Her fasting blood glucose level is 144 mg/dL and she has 3+ glycosuria. How do you counsel her regarding the risk of fetal anomalies?

A. Her risk is the same as other women of the same age group.
B. She has a twice as high risk as other 28-year-old women.
C. She has a four-fold higher risk of having a child with congenital anomalies. (Correct Answer)
D. She has a 10 times higher risk than other women.

Explanation: ### Explanation **1. Why Option C is Correct:** The patient’s fasting blood glucose (FBG) of **144 mg/dL** (threshold ≥126 mg/dL) at the first prenatal visit indicates **Overt Diabetes (Pre-gestational Diabetes)**, not Gestational Diabetes Mellitus (GDM). The risk of congenital anomalies is directly linked to **periconceptional glycemic control**. In pre-gestational diabetes, hyperglycemia during the period of organogenesis (first 8 weeks) is teratogenic. According to standard obstetric literature (Williams Obstetrics), women with pre-gestational diabetes have a **3 to 4 times higher risk** (approximately 6-12% vs. 2-3% in the general population) of having a child with major structural anomalies. **2. Why Other Options are Incorrect:** * **Option A:** This applies to GDM (diagnosed after 24 weeks), where the fetus is not exposed to hyperglycemia during organogenesis. * **Option B:** This underestimates the risk associated with the significant hyperglycemia (FBG 144 mg/dL) seen in this patient. * **Option D:** While the risk is significantly elevated, a 10-fold increase is statistically inaccurate for the general diabetic population, though risk increases linearly with HbA1c levels. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Anomaly:** Cardiovascular anomalies (specifically **Ventricular Septal Defect**). * **Most Specific Anomaly:** **Caudal Regression Syndrome** (Sacral Agenesis). * **Diagnosis of Overt Diabetes in Pregnancy:** FBG ≥126 mg/dL, HbA1c ≥6.5%, or Random Blood Sugar ≥200 mg/dL (with symptoms) at the initial visit. * **Management Goal:** Pre-conception HbA1c should ideally be **<6.5%** to minimize the risk of malformations.

Question 379: What does Chadwick sign indicate?

A. Bluish discoloration or dusky hue of the vestibule and anterior vaginal wall (Correct Answer)
B. Pulsations felt through lateral fornices
C. Softening of the cervix
D. All of the above

Explanation: **Explanation:** **Chadwick’s Sign** (also known as Jacquemier’s sign) is a presumptive sign of pregnancy characterized by a **bluish or purplish discoloration** of the vestibule and anterior vaginal wall. This occurs due to increased vascularity and pelvic congestion triggered by rising estrogen levels. It typically appears around the **8th week** of gestation. **Analysis of Options:** * **Option A (Correct):** This accurately describes Chadwick’s sign. The dusky hue is a result of local venous congestion. * **Option B (Incorrect):** This describes **Osiander’s sign**, which refers to increased pulsations felt through the lateral fornices due to increased vascularity of the uterine artery. * **Option C (Incorrect):** This describes **Goodell’s sign**, which is the significant softening of the cervix (often compared to the softness of the lips, whereas a non-pregnant cervix feels like the tip of the nose). * **Option D (Incorrect):** While all these are signs of pregnancy, they are distinct clinical findings with specific names. **High-Yield Clinical Pearls for NEET-PG:** * **Hegar’s Sign:** Softening of the lower uterine segment (isthmus), typically detectable between 6–10 weeks. * **Palmer’s Sign:** Regular, rhythmic uterine contractions felt during a bimanual examination in early pregnancy. * **Piskacek’s Sign:** Asymmetrical enlargement of the uterus if implantation occurs near one of the cornua. * **Timeline:** Most of these clinical signs (Chadwick, Goodell, Hegar) become evident between **6 to 10 weeks** of gestation.

Question 380: What is the daily extra calorie requirement during the first trimester of pregnancy?

A. 50
B. 150 (Correct Answer)
C. 350
D. 450

Explanation: The nutritional requirements during pregnancy are a high-yield topic for NEET-PG, specifically focusing on the incremental changes across trimesters. ### **Explanation** The correct answer is **150 kcal/day**. During the **first trimester**, fetal growth is minimal (the fetus weighs only about 15-30 grams by the end of 12 weeks), and the metabolic demands on the mother are relatively low. According to the **ICMR (Indian Council of Medical Research)** and WHO guidelines, the extra energy requirement is approximately **150 kcal/day** to support early organogenesis and maternal physiological adaptations. ### **Analysis of Options** * **Option A (50 kcal):** This is too low to meet the physiological changes, such as blood volume expansion and breast tissue development, that begin in early pregnancy. * **Option C (350 kcal):** This is the requirement for the **second trimester**. During this phase, maternal tissues (fat stores) and fetal growth accelerate significantly. * **Option D (450 kcal):** This is the requirement for the **third trimester** (specifically ~452 kcal/day), where the fetus gains the majority of its weight. ### **High-Yield Clinical Pearls for NEET-PG** * **Total Weight Gain:** For a woman with a normal BMI, the recommended weight gain is **11–16 kg**. * **Weight Gain Pattern:** 1–2 kg in the 1st trimester, followed by ~0.5 kg per week in the 2nd and 3rd trimesters. * **Lactation:** The extra calorie requirement during the first 6 months of lactation is significantly higher (**+600 kcal/day**) than during pregnancy. * **Protein:** The additional protein requirement is **+0.5 g/day** (1st trimester), **+6.9 g/day** (2nd trimester), and **+22.7 g/day** (3rd trimester).

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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