Prenatal Care — MCQs

A 22-year-old woman at 14 weeks gestation presents for routine antenatal testing. Her urine dipstick is positive for leukocyte esterase, and a subsequent urine culture reveals E. coli with >100,000 organisms/mL. The patient reports no urinary symptoms. Which of the following statements regarding her condition is false?

Q209Easy

On bimanual palpation, the finding of an absent uterus is termed as which of the following?

Q210Medium

Which of the following is a cause of decreased maternal serum alpha-fetoprotein?

Prenatal Care Indian Medical PG Practice Questions and MCQs

Question 201: All of the following are ultrasonographic fetal growth parameters EXCEPT?

A. Biparietal diameter
B. Head circumference
C. Transcerebeller diameter (Correct Answer)
D. Femur length

Explanation: In fetal ultrasonography, parameters are categorized into those used for **dating** (gestational age) and those used for **growth assessment**. ### Why Transcerebellar Diameter (TCD) is the Correct Answer The **Transcerebellar Diameter (TCD)** is highly resistant to growth restriction (IUGR). Because the cerebellum's growth is relatively independent of external factors and fetal nutrition, it remains a reliable indicator of **gestational age (dating)**, even when the fetus is growth-restricted. It is not used to monitor or calculate fetal weight/growth. ### Explanation of Incorrect Options (Growth Parameters) The other three parameters are the standard components used in the **Hadlock Formula** to estimate fetal weight and assess growth: * **Biparietal Diameter (BPD):** Measures the width of the fetal head. While used for dating in the second trimester, it is a core component of growth assessment. * **Head Circumference (HC):** A more reliable indicator of head growth than BPD, especially if the head is flattened (dolichocephaly) or rounded (brachycephaly). * **Femur Length (FL):** Reflects the longitudinal growth of the fetus and is the most reliable long-bone parameter for growth. * *(Note: Abdominal Circumference (AC) is the most sensitive single parameter for fetal growth/IUGR, though not listed in the options).* ### High-Yield Clinical Pearls for NEET-PG * **Best parameter for dating (1st Trimester):** Crown-Rump Length (CRL). * **Best parameter for dating (2nd Trimester):** Transcerebellar Diameter (TCD). * **Most sensitive parameter for IUGR:** Abdominal Circumference (AC). * **TCD Rule of Thumb:** Between 14 and 20 weeks, the TCD in millimeters is roughly equal to the gestational age in weeks.

Question 202: Deficiency of which substance during early pregnancy will result in neural tube defect?

A. Folic acid (Correct Answer)
B. Iron
C. Cyanocobalamin
D. Antioxidants

Explanation: **Explanation:** **Folic Acid (Vitamin B9)** is essential for DNA synthesis and methylation processes. During the first few weeks of pregnancy (often before a woman knows she is pregnant), the neural tube undergoes closure. Folic acid deficiency impairs rapid cell division and tissue differentiation, leading to failure of the neural tube to close, resulting in **Neural Tube Defects (NTDs)** like Anencephaly or Spina Bifida. **Analysis of Options:** * **Iron:** Deficiency leads to maternal anemia and may cause low birth weight or preterm birth, but it is not causative for NTDs. * **Cyanocobalamin (B12):** While B12 is a cofactor in folate metabolism and its deficiency is a risk factor for NTDs, **Folic Acid** is the primary and most direct substance linked to these defects in clinical practice and public health guidelines. * **Antioxidants:** While they reduce oxidative stress, there is no direct evidence linking their deficiency specifically to the structural failure of neural tube closure. **High-Yield Clinical Pearls for NEET-PG:** * **Critical Period:** The neural tube closes by **Day 28** of gestation (4 weeks post-conception). * **Prophylactic Dose:** 0.4 mg (400 mcg) daily for all women of reproductive age, starting at least 1 month before conception. * **High-Risk Dose:** 4 mg daily for women with a previous history of a child with NTD or those on anti-epileptic drugs (e.g., Valproate). * **Biochemical Marker:** Elevated **Alpha-fetoprotein (AFP)** in maternal serum and amniotic fluid is a screening marker for open NTDs.

Question 203: Neural tube defects are prevented by which of the following?

A. Folic acid (Correct Answer)
B. Vitamin B12
C. Vitamin B6
D. Vitamin C

Explanation: **Explanation:** **1. Why Folic Acid is Correct:** Folic acid (Vitamin B9) is essential for DNA synthesis and methylation processes. During the first 28 days of gestation—often before a woman knows she is pregnant—the neural tube closes. Adequate folate levels are critical for the rapid cell division required for this closure. Deficiency leads to failure of the neural tube to fuse, resulting in defects like **Anencephaly** or **Spina Bifida**. **2. Why Other Options are Incorrect:** * **Vitamin B12 (Cobalamin):** While B12 works synergistically with folate in the methionine cycle, it is not the primary supplement recommended for NTD prevention. * **Vitamin B6 (Pyridoxine):** Primarily used in pregnancy to treat **Hyperemesis Gravidarum** (nausea and vomiting). * **Vitamin C:** An antioxidant that aids iron absorption but has no proven role in preventing structural neural tube malformations. **3. High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Supplementation must be **pre-conceptional** (started at least 1 month before conception) and continued through the **first trimester** (12 weeks). * **Dosage (Low Risk):** **400 μg (0.4 mg)** daily for the general population. * **Dosage (High Risk):** **4 mg** daily if there is a previous history of a child with NTD, maternal epilepsy (on anticonvulsants like Valproate), or maternal diabetes. * **Screening:** Maternal Serum Alpha-Fetoprotein (**MSAFP**) is elevated in open neural tube defects. * **Anticonvulsant Link:** Drugs like Phenytoin and Carbamazepine act as folate antagonists, increasing NTD risk.

Question 204: Which of the following trace elements cannot be completely supplemented by diet in pregnancy?

A. Iron (Fe) (Correct Answer)
B. Calcium (Ca++)
C. Zinc (Zn)
D. Manganese

Explanation: **Explanation:** The correct answer is **Iron (Fe)**. During pregnancy, the total iron requirement is approximately **1000 mg** (300 mg for the fetus/placenta, 500 mg for maternal red cell mass expansion, and 200 mg for obligatory losses). This demand increases significantly in the second and third trimesters, reaching up to 6–7 mg/day. Even with a balanced diet rich in heme and non-heme iron, the maximum absorption from the gut is limited. Therefore, dietary intake alone cannot meet these physiological demands, making routine oral iron supplementation (60 mg elemental iron daily as per WHO/GOI guidelines) mandatory for all pregnant women. **Analysis of Incorrect Options:** * **Calcium (Ca++):** While the demand for calcium increases (approx. 30g total), it can theoretically be met through a diet rich in dairy products and green leafy vegetables. However, supplementation is often given to prevent hypertensive disorders (Preeclampsia). * **Zinc (Zn):** Zinc requirements increase slightly during pregnancy for fetal growth, but the amounts required are small enough to be easily obtained from a standard diet containing nuts, legumes, and meat. * **Manganese:** This is a trace element required in minute quantities. Deficiencies are extremely rare as it is abundant in whole grains and vegetables; thus, routine supplementation is never required. **High-Yield Clinical Pearls for NEET-PG:** * **Iron absorption:** It is maximal in the duodenum and upper jejunum. Absorption is enhanced by Vitamin C and inhibited by tea, coffee, and calcium. * **Prophylactic Dose (IFA):** 60 mg elemental iron + 500 mcg Folic acid for 180 days (starting from the 14th week). * **Therapeutic Dose:** 120 mg elemental iron daily if the patient is diagnosed with anemia. * **Folic Acid:** While not a trace element, it is the only other nutrient (besides Iron) that cannot be met by diet alone to prevent Neural Tube Defects (NTDs).

Question 205: Alpha-fetoprotein is increased in all conditions except?

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

Explanation: **Explanation:** Alpha-fetoprotein (AFP) is a glycoprotein synthesized by the fetal yolk sac and later the fetal liver. It is the fetal equivalent of albumin. Maternal Serum AFP (MSAFP) levels are a crucial screening tool during the second trimester (15–20 weeks). **Why Chromosomal Trisomy is the correct answer:** In conditions like **Down Syndrome (Trisomy 21)** and **Edwards Syndrome (Trisomy 18)**, MSAFP levels are characteristically **decreased**, not increased. In Down Syndrome, the triple test typically shows low AFP, low uE3 (unconjugated estriol), and high hCG. **Why the other options are incorrect:** AFP levels increase whenever there is a defect in the fetal skin or membranes, allowing AFP to leak into the amniotic fluid and maternal circulation. * **Cloacal exstrophy & Exomphalos (Omphalocele):** These are ventral wall defects. Any "open" defect (including Gastroschisis and Neural Tube Defects) leads to significantly elevated AFP. * **Tracheoesophageal fistula (TEF):** This condition, along with esophageal or duodenal atresia, interferes with the fetal swallowing and digestion of amniotic fluid, leading to increased AFP levels in the amniotic fluid and maternal serum. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of elevated MSAFP:** Gestational age error (underestimation of pregnancy dates). * **Conditions with Increased AFP:** Neural Tube Defects (Anencephaly, Spina Bifida), Multiple pregnancy, Ventral wall defects, Renal anomalies (Congenital nephrosis), and Fetal demise. * **Conditions with Decreased AFP:** Trisomies (21, 18, 13), Gestational Trophoblastic Disease (Molar pregnancy), and Maternal obesity. * **Rule of Thumb:** If the fetal "barrier" (skin/gut/spine) is broken or if swallowing is impaired, AFP goes **UP**. In most chromosomal aneuploidies, AFP goes **DOWN**.

Question 206: Which of the following screening tests is NOT recommended by the CDC in pregnant females?

A. ELISA for HIV
B. HBsAg
C. NAAT for Chlamydia and Gonorrhea
D. Saline microscopy for bacterial vaginosis (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Saline microscopy for bacterial vaginosis.** According to the **CDC and USPSTF guidelines**, universal screening for Bacterial Vaginosis (BV) in asymptomatic pregnant women is **not recommended**. Clinical trials have shown that screening and treating asymptomatic BV does not significantly reduce the risk of preterm birth or other adverse pregnancy outcomes in the general obstetric population. Therefore, testing (via saline microscopy for Clue cells or Whiff test) is reserved only for symptomatic patients. **Analysis of Incorrect Options:** * **A. ELISA for HIV:** Universal "opt-out" screening is mandatory at the first prenatal visit. Early detection allows for HAART initiation, which reduces vertical transmission from ~25% to <1%. * **B. HBsAg:** Screening for Hepatitis B surface antigen is mandatory for all pregnant women at the first visit to identify neonates requiring immunoprophylaxis (HBIG + Vaccine) at birth. * **C. NAAT for Chlamydia and Gonorrhea:** The CDC recommends universal screening for Chlamydia in all pregnant women <25 years (and older women at high risk). Screening for Gonorrhea is recommended for those at increased risk. **High-Yield Clinical Pearls for NEET-PG:** * **Syphilis:** Universal screening via serology (VDRL/RPR) is mandatory at the first visit. * **GBS (Group B Strep):** Universal screening via vaginal-rectal swab is performed at **36 0/7 to 37 6/7 weeks** of gestation. * **Diabetes:** Universal screening for GDM is done at **24–28 weeks** using the OGTT (DIPSI or IADPSG criteria). * **Bacteriuria:** Screening for **Asymptomatic Bacteriuria** (via urine culture) is mandatory at 12–16 weeks to prevent pyelonephritis.

Question 207: Which of the following steps are useful in the perinatal prevention of mother-to-child transmission?

A. Cleaning the mother's vagina with antiseptic lotion
B. Elective Cesarean section
C. Avoiding breastfeeding
D. Antiretroviral prophylaxis (Correct Answer)

Explanation: **Explanation:** The primary goal of preventing mother-to-child transmission (PMTCT) of HIV is to reduce the viral load in the mother and provide pre-exposure prophylaxis to the infant. **1. Why Antiretroviral Prophylaxis (ART) is correct:** ART is the **most effective** intervention. By suppressing maternal plasma viral load to undetectable levels, the risk of transmission is reduced to less than 1%. In India, under the National AIDS Control Organization (NACO) guidelines, all pregnant women living with HIV should be started on a lifelong Triple ART regimen (typically TLD: Tenofovir + Lamivudine + Dolutegravir) regardless of CD4 count or clinical stage. **2. Analysis of Incorrect Options:** * **Cleaning the vagina with antiseptic (Option A):** While chlorhexidine wipes were once studied, clinical trials have proven they **do not** significantly reduce HIV transmission during labor. * **Elective Cesarean Section (Option B):** While ELSCS reduces risk if the viral load is >1000 copies/mL, it is **not** routinely recommended for all. If the viral load is undetectable (<50 copies/mL) at 36 weeks, a vaginal delivery is safe and preferred. * **Avoiding breastfeeding (Option C):** While replacement feeding eliminates postnatal risk, it is often unsafe in resource-limited settings due to malnutrition and infection. Current WHO and NACO guidelines promote **exclusive breastfeeding for 6 months** while the mother remains on ART, as the benefits outweigh the risks. **High-Yield Clinical Pearls for NEET-PG:** * **Transmission Risk:** Without intervention, the risk is 20–45%. With ART, it is <1%. * **Infant Prophylaxis:** Infants born to HIV-positive mothers receive **Nevirapine** (or Zidovudine) for 6 weeks (extendable to 12 weeks in high-risk cases). * **Most common timing:** Most transmissions occur **intrapartum** (during labor). * **Avoid:** Artificial Rupture of Membranes (ARM), fetal scalp electrodes, and instrumental delivery unless absolutely necessary, as these increase blood contact.

Question 208: A 22-year-old woman at 14 weeks gestation presents for routine antenatal testing. Her urine dipstick is positive for leukocyte esterase, and a subsequent urine culture reveals E. coli with >100,000 organisms/mL. The patient reports no urinary symptoms. Which of the following statements regarding her condition is false?

A. Asymptomatic bacteriuria in pregnancy is associated with preterm delivery and low birth weight.
B. There is an increased incidence of asymptomatic bacteriuria in women with sickle cell trait.
C. No treatment is warranted as the patient is asymptomatic. (Correct Answer)
D. Approximately 25% of patients with asymptomatic bacteriuria will subsequently develop an acute symptomatic urinary infection during pregnancy if left untreated.

Explanation: **Explanation:** The patient has **Asymptomatic Bacteriuria (ASB)**, defined as the presence of >10^5 colony-forming units (CFU)/mL of a single uropathogen in a midstream clean-catch urine specimen from an individual without symptoms of a urinary tract infection (UTI). **1. Why Option C is the Correct Answer (False Statement):** In non-pregnant individuals, ASB is often left untreated. However, **pregnancy is a mandatory indication for treatment.** Physiological changes (progesterone-mediated ureteral dilation and bladder relaxation) increase the risk of ascending infection. Treating ASB significantly reduces the risk of maternal and fetal complications. Therefore, the statement that "no treatment is warranted" is medically incorrect. **2. Analysis of Incorrect Options (True Statements):** * **Option A:** Untreated ASB is strongly associated with adverse pregnancy outcomes, including **preterm labor (PTL)** and **low birth weight (LBW)** infants. * **Option B:** There is a documented increased incidence of ASB in pregnant women with **Sickle Cell Trait** and Diabetes Mellitus. * **Option C:** If left untreated, approximately **25–40%** of pregnant women with ASB will develop **acute pyelonephritis**, which can lead to maternal sepsis and ARDS. **Clinical Pearls for NEET-PG:** * **Screening:** All pregnant women should be screened for ASB at the first prenatal visit (ideally between 12–16 weeks) using a **urine culture** (Gold Standard). * **Treatment:** Common first-line agents include **Nitrofurantoin** (avoid near term due to risk of fetal hemolysis), **Amoxicillin**, or **Cephalexin**. * **Follow-up:** A repeat urine culture ("test of cure") is mandatory 1–2 weeks after completing treatment.

Question 209: On bimanual palpation, the finding of an absent uterus is termed as which of the following?

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

Explanation: **Explanation:** **Hegar’s sign** is a classic clinical finding of early pregnancy, typically appearing between **6 to 10 weeks** of gestation. It occurs due to the marked softening of the uterine isthmus (the lower segment). During a bimanual examination, the softened isthmus becomes so compressible that the cervix and the body of the uterus feel like two separate entities. This creates the clinical illusion that the **uterus is "absent"** or disconnected between the fingers of the internal and external hands. **Analysis of Incorrect Options:** * **Palmer’s sign:** Refers to regular, rhythmic uterine contractions felt during a bimanual examination as early as 4–8 weeks of pregnancy. * **Chadwick’s sign:** A presumptive sign of pregnancy characterized by a bluish or purplish discoloration of the cervix, vagina, and vulva due to increased vascularity (venous congestion). * **Goodell’s sign:** Refers to the significant softening of the vaginal portion of the cervix (often compared to the softness of the lips, whereas a non-pregnant cervix feels like the tip of the nose). **High-Yield Clinical Pearls for NEET-PG:** * **Hegar’s Sign:** Softening of the **isthmus** (6–10 weeks). * **Goodell’s Sign:** Softening of the **cervix** (6 weeks). * **Ladin’s Sign:** Softening of the anterior midline of the uterus at the junction with the cervix (6 weeks). * **Piskacek’s Sign:** Asymmetrical enlargement of the uterus if implantation occurs near one of the cornua. * **Osiander’s Sign:** Increased pulsation felt through the lateral vaginal fornices due to increased vascularity (8 weeks).

Question 210: Which of the following is a cause of decreased maternal serum alpha-fetoprotein?

A. Neural tube defects
B. Fetal demise
C. Hepatitis
D. Aneuploidy (Correct Answer)

Explanation: **Explanation:** Maternal Serum Alpha-Fetoprotein (MSAFP) is a glycoprotein produced initially by the fetal yolk sac and later by the fetal liver. It is a crucial screening marker used between 15 and 20 weeks of gestation. **Why Aneuploidy is Correct:** In pregnancies affected by **chromosomal abnormalities (Aneuploidies)**, specifically **Down Syndrome (Trisomy 21)** and **Edwards Syndrome (Trisomy 18)**, the MSAFP levels are characteristically **decreased**. While the exact pathophysiology is complex, it is attributed to a decrease in the production of AFP by the fetal liver or a reduced transport across the placenta in these conditions. **Analysis of Incorrect Options:** * **A. Neural Tube Defects (NTDs):** Conditions like anencephaly and spina bifida involve "open" defects where AFP leaks directly into the amniotic fluid and subsequently into maternal serum, leading to **elevated** MSAFP. * **B. Fetal Demise:** When the fetus dies, the breakdown of fetal tissues and the loss of placental integrity cause a massive release of AFP into the maternal circulation, resulting in **elevated** MSAFP. * **C. Hepatitis:** Maternal liver disease (like hepatitis or cirrhosis) can cause an **elevation** in MSAFP because the maternal liver itself begins to produce AFP during regeneration or due to hepatocellular damage. **NEET-PG High-Yield Pearls:** * **Causes of Increased MSAFP:** Open NTDs, abdominal wall defects (Omphalocele, Gastroschisis), Multiple gestations, Fetal demise, and Renal anomalies (Finnish-type nephrosis). * **Most Common Cause of Abnormal MSAFP:** Incorrect gestational dating (underestimation for high levels, overestimation for low levels). * **Triple Test for Down Syndrome:** Decreased MSAFP, Decreased Unconjugated Estriol (uE3), and **Increased** hCG. * **Quadruple Test:** Adds **Increased** Inhibin-A to the triple test markers.

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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