Prenatal Care — MCQs

A 23-year-old woman at 10 weeks' gestation presents for her initial evaluation. She has a history of asthma exacerbations requiring hospitalization but has never needed intubation or intensive care unit admission. Her asthma is controlled with daily inhaled corticosteroids and albuterol, providing adequate symptom relief. She is concerned about continuing these medications during pregnancy. Which of the following is true regarding asthma medications in pregnancy?

Prenatal Care Indian Medical PG Practice Questions and MCQs

Question 301: Which of the following dietary supplements is recommended for a pregnant patient receiving Heparin therapy?

A. Folic acid
B. Calcium (Correct Answer)
C. Zinc
D. Copper

Explanation: **Explanation:** **Correct Option: B (Calcium)** The primary reason for recommending Calcium supplementation in pregnant patients on long-term Heparin therapy is to mitigate the risk of **Heparin-Induced Osteoporosis**. Heparin increases osteoclast activity and decreases osteoblast function, leading to a reduction in bone mineral density. Since pregnancy itself increases calcium demands for fetal skeletal development, the addition of Heparin significantly elevates the risk of maternal bone loss and vertebral fractures. Therefore, patients on Heparin (either Unfractionated Heparin or LMWH) should receive supplemental Calcium (1000–1500 mg/day) and Vitamin D. **Incorrect Options:** * **A. Folic acid:** While Folic acid is routinely supplemented in all pregnancies to prevent Neural Tube Defects (NTDs), its requirement is not specifically linked to Heparin therapy. * **C & D. Zinc and Copper:** These are trace elements. While they are present in standard prenatal multivitamins, there is no specific clinical indication or increased requirement for them necessitated by Heparin administration. **NEET-PG High-Yield Pearls:** * **Heparin vs. Warfarin:** Heparin is the anticoagulant of choice in pregnancy because it is a large molecule that **does not cross the placenta**, unlike Warfarin, which is teratogenic (causing Fetal Warfarin Syndrome). * **LMWH vs. UFH:** Low Molecular Weight Heparin (LMWH), such as Enoxaparin, is preferred over Unfractionated Heparin (UFH) due to a lower risk of osteoporosis and Heparin-Induced Thrombocytopenia (HIT). * **Monitoring:** UFH is monitored using **aPTT**, whereas LMWH usually does not require monitoring (though **Anti-Xa levels** are used if necessary).

Question 302: A 35-year-old female with a previous history of a child with Down's syndrome presents with 18 weeks of amenorrhea. What is the investigation of choice to rule out Down's syndrome in the present pregnancy?

A. Triple test
B. Amniocentesis (Correct Answer)
C. Cordocentesis
D. Chorionic villous biopsy

Explanation: **Explanation:** The patient is currently at **18 weeks of gestation** and has a high-risk history (previous child with Down’s syndrome). To "rule out" a chromosomal anomaly, a **diagnostic test** (karyotyping) is required rather than a screening test. **1. Why Amniocentesis is the Correct Answer:** Amniocentesis is the gold-standard diagnostic procedure performed between **15–20 weeks** of gestation. Since the patient is at 18 weeks, this is the most appropriate window. It involves aspirating amniotic fluid to obtain fetal desquamated cells for karyotyping, providing a definitive diagnosis of trisomy 21. **2. Why the other options are incorrect:** * **Triple Test (Option A):** This is a **screening test** (measuring AFP, hCG, and uE3). Screening tests only provide a risk probability and cannot "rule out" or confirm the diagnosis. * **Chorionic Villous Biopsy (CVS) (Option D):** While CVS is a diagnostic test, it is ideally performed between **10–13 weeks**. At 18 weeks, the placenta is more formed, and amniocentesis is technically safer and preferred over CVS. * **Cordocentesis (Option C):** Also known as Percutaneous Umbilical Blood Sampling (PUBS), it is usually performed after **18–20 weeks**. However, it carries a higher risk of fetal loss (1–2%) compared to amniocentesis (0.5%) and is generally reserved for rapid karyotyping or fetal blood disorders. **Clinical Pearls for NEET-PG:** * **Best time for Amniocentesis:** 15–20 weeks (Early amniocentesis <14 weeks is avoided due to risk of clubfoot/talipes). * **Most common complication of Amniocentesis:** Premature rupture of membranes (PROM) and fetal loss (0.5%). * **Combined Screening (1st Trimester):** Nuchal translucency (NT) + PAPP-A + hCG (performed at 11–13+6 weeks). * **Quadruple Test:** Triple test + Inhibin A (best screening sensitivity in the 2nd trimester).

Question 303: Screening for gestational diabetes mellitus (GDM) is not required for which of the following conditions?

A. Previous delivery of a macrosomic infant
B. Previous delivery with congenital malformation
C. Previous stillbirth
D. Previous pre-eclampsia (Correct Answer)

Explanation: **Explanation:** The screening for Gestational Diabetes Mellitus (GDM) is primarily targeted at identifying women with specific risk factors that suggest underlying insulin resistance or metabolic dysfunction. **Why Option D is correct:** While **Pre-eclampsia** is a *complication* of GDM, a history of pre-eclampsia in a previous pregnancy is not a standalone indication for GDM screening in the current pregnancy according to standard guidelines (like DIPSI or IADPSG). Pre-eclampsia is primarily a vascular and endothelial disorder. While it shares some metabolic risk factors with GDM (like obesity), it does not directly imply a high risk of glucose intolerance in the same way that fetal macrosomia or unexplained fetal loss does. **Why the other options are wrong:** * **A. Previous macrosomic infant (>4kg):** This is a classic hallmark of fetal hyperinsulinemia caused by maternal hyperglycemia. It indicates a high risk of recurrent GDM. * **B. Previous congenital malformation:** Poorly controlled pre-gestational or early gestational diabetes is teratogenic (e.g., Sacral agenesis, Cardiac defects). A history of malformation necessitates early screening to rule out undiagnosed Type 2 DM. * **C. Previous stillbirth:** Unexplained third-trimester stillbirth is a known complication of maternal hyperglycemia due to fetal acidemia and hypoxia. **High-Yield Clinical Pearls for NEET-PG:** * **DIPSI Guidelines (India):** Screening is performed at the first prenatal visit and repeated at 24–28 weeks. A single-step test using **75g glucose** is used; a 2-hour plasma glucose **≥140 mg/dL** is diagnostic of GDM, regardless of the fasting state. * **Risk Factors for GDM:** BMI >30 kg/m², Age >35, First-degree relative with DM, PCOS, and history of GDM in a previous pregnancy. * **Most common malformation in GDM:** Ventricular Septal Defect (VSD). * **Most specific malformation in GDM:** Caudal Regression Syndrome (Sacral Agenesis).

Question 304: A 36-year-old HIV-positive female is on antiretroviral therapy. Which of the following first-trimester markers of Down syndrome would be affected?

A. Beta-hCG (Correct Answer)
B. PAPP-A
C. Nuchal Translucency (NT)
D. All of the above

Explanation: **Explanation:** In the first trimester, screening for Down syndrome (Trisomy 21) typically involves the "Combined Test," which includes Nuchal Translucency (NT) ultrasound and maternal serum markers (PAPP-A and free $\beta$-hCG). **1. Why Beta-hCG is the Correct Answer:** Studies have consistently shown that maternal HIV infection and the use of Antiretroviral Therapy (ART) significantly alter serum biochemical markers. Specifically, **$\beta$-hCG levels are significantly higher** in HIV-positive women compared to HIV-negative women. This elevation can lead to an increased false-positive rate during Down syndrome screening if not adjusted for the patient's HIV status. **2. Why Other Options are Incorrect:** * **PAPP-A (Pregnancy-Associated Plasma Protein A):** While some studies suggest a slight decrease in PAPP-A levels in HIV-positive women, the effect is much less consistent and statistically significant compared to the elevation seen in $\beta$-hCG. * **Nuchal Translucency (NT):** NT is a sonographic marker (structural). It is **not affected** by maternal HIV status or ART. It remains the most reliable screening tool in these patients as it provides an objective measurement independent of biochemical alterations. * **All of the above:** Incorrect because NT remains unaffected. **Clinical Pearls for NEET-PG:** * **Screening Accuracy:** Due to biochemical interference, HIV-positive women have a higher **false-positive rate** for Trisomy 21 screening. * **Second Trimester:** In the Quadruple marker test, HIV-positive status is associated with higher levels of **$\beta$-hCG and Inhibin-A**, and lower levels of **uE3 (Unconjugated Estriol)**. * **Preferred Method:** For HIV-positive patients, **NIPT (Non-Invasive Prenatal Testing)** or **NT scans** are preferred over serum biochemistry to minimize false positives. * **Invasive Testing:** If an amniocentesis is required, it should ideally be performed only after the viral load is undetectable to minimize the risk of vertical transmission.

Question 305: A healthy 20-year-old G1P0 presents for her first OB visit at 10 weeks gestational age. She denies any significant medical history both personally and in her family. Which of the following tests should NOT be ordered as part of the initial prenatal care visit?

A. HIV
B. Hepatitis B surface antigen
C. One-hour glucose tolerance test (Correct Answer)
D. Type and screen

Explanation: **Explanation:** The initial prenatal visit (booking visit) aims to establish a baseline for maternal health and screen for conditions that could adversely affect the pregnancy. **Why Option C is correct:** The **One-hour Glucose Tolerance Test (GTT)** is a screening tool for Gestational Diabetes Mellitus (GDM). In a low-risk, healthy patient (G1P0, no family history, normal BMI), GDM screening is standardly performed between **24 and 28 weeks** of gestation. This timing is chosen because insulin resistance, driven by placental hormones like Human Placental Lactogen (hPL), peaks during the late second and early third trimesters. Performing it at 10 weeks in a low-risk patient is premature. **Why the other options are incorrect:** * **HIV (Option A):** Universal "opt-out" screening for HIV is mandatory at the first visit to prevent vertical transmission through early antiretroviral therapy. * **Hepatitis B surface antigen (HBsAg) (Option B):** Screening is essential at the first visit to identify neonates who will require the Hep B vaccine and Immunoglobulin (HBIG) at birth. * **Type and Screen (Option D):** Determining blood group and Rh status is critical to identify Rh-negative mothers who require Anti-D prophylaxis to prevent isoimmunization. **Clinical Pearls for NEET-PG:** * **Early GDM Screening:** Only indicated at the first visit if the patient is high-risk (BMI >30, history of GDM, known PCOS, or strong family history of Type 2 DM). * **DIPSI Guidelines:** In India, the Diabetes in Pregnancy Study Group India (DIPSI) recommends a 75g Oral Glucose Tolerance Test (OGTT) at the first visit regardless of risk, but international guidelines (ACOG/RCOG) and standard textbooks (Williams) follow the 24-28 week window for low-risk patients. * **Other Initial Tests:** CBC (for anemia), Syphilis (VDRL/RPR), Rubella immunity, and Urine culture (for asymptomatic bacteriuria).

Question 306: Cervix undergoes softening in early pregnancy. What is this sign called?

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

Explanation: **Explanation:** The correct answer is **Goodell’s sign**. During early pregnancy (typically around 6 weeks), increased vascularity and edema of the cervix lead to its softening. In a non-pregnant state, the cervix feels firm like the tip of the nose; however, due to Goodell’s sign, it becomes soft, feeling more like the lips or earlobe. **Analysis of Options:** * **A. Chadwick’s sign:** This refers to the bluish/purplish discoloration of the cervix, vagina, and labia due to pelvic venous congestion. It is also known as Jacquemier’s sign and appears around 6–8 weeks. * **C. Hegar’s sign:** This is the softening of the **isthmus** (the lower uterine segment). On bimanual examination, the upper part of the uterus and the cervix feel like two separate entities because the intervening isthmus is so soft. It is most evident between 6–10 weeks. * **D. Palmer’s sign:** This refers to regular, rhythmic, painless uterine contractions that can be felt during a bimanual examination as early as 4–8 weeks of gestation. **High-Yield Clinical Pearls for NEET-PG:** * **Osiander’s sign:** Increased pulsation felt through the lateral vaginal fornices due to increased vascularity (at 8 weeks). * **Piskacek’s sign:** Asymmetrical enlargement of the uterus if implantation occurs near one of the cornua. * **Ladins sign:** Softening of the anterior midline of the uterus at the junction of the cervix and body (at 6 weeks). * **Rule of Thumb:** If the question mentions **Cervical Softening**, think **Goodell’s**; if it mentions **Cervical Color**, think **Chadwick’s**.

Question 307: Increased nuchal translucency at 14 weeks gestation is seen in which of the following conditions?

A. Turner's syndrome
B. Down's syndrome (Correct Answer)
C. Hydrocephalus
D. Skeletal dysplasia

Explanation: **Explanation:** **Nuchal Translucency (NT)** refers to the subcutaneous collection of fluid behind the fetal neck, visualized via ultrasound between **11 and 13 weeks 6 days** of gestation (CRL 45–84 mm). An increased NT measurement (typically >3.0 mm or >95th percentile) is a hallmark screening marker for chromosomal abnormalities. **Why Down’s Syndrome is correct:** Trisomy 21 (Down’s syndrome) is the most common chromosomal cause of increased NT. The pathophysiology involves delayed development of the lymphatic system and alterations in the extracellular matrix (overexpression of Type VI collagen), leading to fluid accumulation in the nuchal region. **Analysis of Incorrect Options:** * **Turner’s Syndrome (45,X):** While Turner’s syndrome is strongly associated with increased NT and cystic hygroma, it is less common than Down’s syndrome in the general screening population. However, in the context of this specific question, Down's is the classic association taught for routine NT screening. * **Hydrocephalus:** This involves the accumulation of CSF within the cerebral ventricles. It is typically diagnosed in the second trimester and is not a primary cause of increased nuchal translucency in the first trimester. * **Skeletal Dysplasia:** While some dysplasias (like Achondroplasia) can occasionally present with increased NT due to thoracic compression, they are not the primary or most common association compared to aneuploidies. **High-Yield Clinical Pearls for NEET-PG:** 1. **Timing is Critical:** NT must be measured between **11 to 13+6 weeks**. After 14 weeks, the lymphatic system develops further, and the fluid usually resolves, making the test inaccurate. 2. **Combined Screening:** NT + PAPP-A + β-hCG has a detection rate of ~90% for Down’s syndrome. 3. **Non-Chromosomal Causes:** Increased NT with a normal karyotype should raise suspicion for **Congenital Heart Defects** (most common), diaphragmatic hernia, or Omphalocele. 4. **Nuchal Fold vs. NT:** Do not confuse them. Nuchal **Fold** thickness is measured in the **second trimester** (18–22 weeks); >6 mm is considered abnormal.

Question 308: Which investigation is contraindicated in an antenatal expectant mother?

A. X-rays (Correct Answer)
B. Ultrasound
C. Urine examination
D. Blood examination

Explanation: **Explanation:** The correct answer is **A. X-rays**. **1. Why X-rays are contraindicated:** X-rays utilize **ionizing radiation**, which is potentially teratogenic and mutagenic to the developing fetus. The risks are highest during the period of organogenesis (2–8 weeks post-conception) and early fetal development. Exposure can lead to congenital malformations, microcephaly, growth restriction, and an increased lifetime risk of childhood leukemia. While a single diagnostic X-ray (like a chest X-ray with abdominal shielding) often falls below the threshold of 5 rad (50 mGy) associated with adverse effects, they are generally avoided unless the maternal benefit significantly outweighs the fetal risk. **2. Why other options are incorrect:** * **B. Ultrasound:** This is the gold standard for fetal monitoring. It uses non-ionizing sound waves and has no documented thermal or mechanical risks to the fetus, making it completely safe. * **C. Urine examination:** Essential for screening for asymptomatic bacteriuria, proteinuria (preeclampsia), and glycosuria. It is a non-invasive, safe procedure. * **D. Blood examination:** Routine blood tests (CBC, blood grouping, serology for HIV/Hepatitis) are mandatory components of antenatal care to ensure maternal and fetal well-being. **High-Yield Clinical Pearls for NEET-PG:** * **Threshold Dose:** Fetal risk is considered negligible at exposures **<5 rad (50 mGy)**. Most diagnostic X-rays are <1 rad. * **Most Sensitive Period:** The fetus is most sensitive to CNS effects (intellectual disability) between **8–15 weeks** of gestation. * **Safe Imaging:** Ultrasound and MRI (without Gadolinium) are the preferred imaging modalities in pregnancy. * **Rule of Thumb:** Always perform a pregnancy test in women of reproductive age before elective radiological procedures (The "10-day rule").

Question 309: An antenatal ultrasound performed at 18-20 weeks of gestation is primarily intended to detect which of the following?

A. Fetal anomalies (Correct Answer)
B. Sex of the fetus
C. Maturity of the fetus
D. Quantity of amniotic fluid

Explanation: ### Explanation The ultrasound performed at **18–20 weeks** of gestation is commonly referred to as the **Level II scan, Anomaly scan, or Mid-trimester Morphology scan**. **1. Why Option A is Correct:** By 18–20 weeks, fetal organogenesis is complete, and the fetus is large enough for detailed anatomical visualization. This window is the "gold standard" for detecting structural malformations (e.g., neural tube defects, cardiac anomalies, or cleft lip/palate) because the ratio of fetal size to amniotic fluid volume is optimal for clear imaging. Furthermore, identifying major anomalies at this stage allows parents to make informed decisions regarding the continuation of pregnancy within legal limits. **2. Why Other Options are Incorrect:** * **Option B (Sex of the fetus):** While the external genitalia are visible, determining the sex for non-medical reasons is **illegal in India** under the PC-PNDT Act. It is never the "primary intent" of a medical scan. * **Option C (Maturity of the fetus):** Fetal maturity (lung maturity) is assessed in the third trimester or via amniocentesis (L/S ratio). At 18–20 weeks, the fetus is pre-viable. * **Option D (Quantity of amniotic fluid):** While liquor is assessed during this scan, it is a secondary observation. Primary assessment of amniotic fluid (AFI) is more clinically significant in the third trimester to monitor placental function and fetal well-being. ### High-Yield Clinical Pearls for NEET-PG: * **Best time for Dating Scan:** 8–12 weeks (CRL is the most accurate parameter for gestational age). * **NT (Nuchal Translucency) Scan:** Performed at 11–13+6 weeks to screen for chromosomal abnormalities (e.g., Trisomy 21). * **Soft Markers:** During the 18–20 week scan, look for "soft markers" like choroid plexus cysts, echogenic intracardiac focus, or single umbilical artery, which may increase the risk of aneuploidy. * **Cervical Length:** This scan is also used to measure cervical length to screen for risk of preterm labor.

Question 310: A 23-year-old woman at 10 weeks' gestation presents for her initial evaluation. She has a history of asthma exacerbations requiring hospitalization but has never needed intubation or intensive care unit admission. Her asthma is controlled with daily inhaled corticosteroids and albuterol, providing adequate symptom relief. She is concerned about continuing these medications during pregnancy. Which of the following is true regarding asthma medications in pregnancy?

A. B2 agonists are contraindicated during pregnancy.
B. Both agonists and inhaled corticosteroids are contraindicated in pregnancy.
C. Both B2 agonists and inhaled corticosteroids are safe in pregnancy. (Correct Answer)
D. B2 agonists and inhaled corticosteroids are both safe in pregnancy but during the second and third trimesters only.

Explanation: ### Explanation **1. Why the Correct Answer is Right:** The primary goal of asthma management in pregnancy is to maintain adequate maternal oxygenation to ensure consistent fetal oxygen delivery. Poorly controlled asthma increases the risk of preeclampsia, preterm birth, and low birth weight. Extensive clinical data and guidelines (such as GINA and NAEPP) confirm that **Short-Acting Beta-Agonists (SABA)** like Albuterol and **Inhaled Corticosteroids (ICS)** like Budesonide are safe and effective. The risk of an acute asthma exacerbation (leading to maternal and fetal hypoxia) far outweighs any theoretical risks associated with these medications. **2. Why the Incorrect Options are Wrong:** * **Option A & B:** These are incorrect because withholding asthma medication leads to poor control. B2 agonists are the rescue medication of choice, and ICS are the gold-standard maintenance therapy. Neither is contraindicated; in fact, they are recommended to prevent status asthmaticus. * **Option D:** This is incorrect because asthma must be controlled throughout the **entire pregnancy**, including the first trimester. Organogenesis is not a contraindication for these inhaled therapies, as systemic absorption is minimal. **3. NEET-PG High-Yield Clinical Pearls:** * **Rule of One-Thirds:** During pregnancy, asthma symptoms improve in 1/3 of patients, worsen in 1/3, and remain stable in 1/3. * **Drug of Choice:** **Albuterol** is the preferred SABA; **Budesonide** is the preferred ICS due to the most extensive safety data in pregnancy. * **Labor Management:** Asthma medications should be continued during labor. If systemic steroids are needed, stress-dose steroids may be required to prevent adrenal crisis. * **Avoidance:** Prostaglandin **F2-alpha (Carboprost)** and **Ergonovine** should be avoided in asthmatic patients during postpartum hemorrhage as they can trigger bronchospasm. Prostaglandin E2 (Dinoprostone) is safe.

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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