Prenatal Care — MCQs

A 21-year-old female presents with amenorrhea of 5 weeks. Her urine pregnancy test is positive. Ultrasound shows a gestational sac and yolk sac within the uterus. No fetal pole or cardiac activity is visible. Crown-rump length (CRL) is 8 mm and mean sac diameter (MSD) is 28 mm. What is the next best step?

Q298Easy

Weight gain in pregnancy is related to all except?

Q299Easy

What is the total iron requirement during pregnancy?

Q300Medium

All of the following are predictive tests for pregnancy-induced hypertension except?

Prenatal Care Indian Medical PG Practice Questions and MCQs

Question 291: Prenatal diagnosis at 16 weeks of pregnancy can be performed using which of the following methods?

A. Amniocentesis for amniotic fluid (Correct Answer)
B. Maternal blood for AFP levels
C. Chorionic villus sampling
D. Fetal blood sampling

Explanation: ### Explanation The correct answer is **A. Amniocentesis for amniotic fluid**. **1. Why Amniocentesis is Correct:** Amniocentesis is the gold-standard invasive prenatal diagnostic procedure performed between **15 and 20 weeks** of gestation (ideally at 16 weeks). At this stage, there is sufficient amniotic fluid (approx. 150-200 mL) to safely withdraw 15-20 mL for fetal karyotyping, biochemical analysis, and DNA studies. The procedure involves ultrasound-guided needle aspiration of fluid containing desquamated fetal cells (amniocytes). **2. Why the Other Options are Incorrect:** * **B. Maternal blood for AFP levels:** This is a **screening test**, not a diagnostic test. While Maternal Serum Alpha-Fetoprotein (MSAFP) is measured between 15-20 weeks to screen for Neural Tube Defects (NTDs), a definitive diagnosis requires imaging or invasive testing. * **C. Chorionic Villus Sampling (CVS):** This is typically performed in the **first trimester**, between **10 and 13 weeks**. Performing it at 16 weeks is technically difficult and carries a higher risk of complications compared to amniocentesis. * **D. Fetal blood sampling (Cordocentesis):** Also known as Percutaneous Umbilical Blood Sampling (PUBS), this is usually performed **after 18 weeks** of gestation when the umbilical vein is large enough to be punctured safely. **3. High-Yield Clinical Pearls for NEET-PG:** * **Early Amniocentesis:** Performed before 15 weeks; it is generally avoided due to a higher risk of clubfoot (talipes equinovarus) and pregnancy loss. * **CVS vs. Amniocentesis:** CVS cannot diagnose Neural Tube Defects (as it doesn't measure AFP); Amniocentesis can. * **Most common complication:** For both procedures, the most common risk is fetal loss (approx. 0.5% for amniocentesis; 1% for CVS). * **Rh-Negative Mothers:** Always administer Anti-D immunoglobulin after any invasive prenatal procedure to prevent isoimmunization.

Question 292: A health-conscious vegetarian patient regularly ingests mega doses of vitamins and herbal therapies daily. She is planning pregnancy and seeks advice on diet and nutrition. Which of the following statements regarding diet recommendations in pregnancy is true?

A. Herbal medications are natural, so there is no reason to avoid these dietary supplements during pregnancy.
B. During pregnancy, the majority of consumed protein should be supplied from animal sources. (Correct Answer)
C. Routine supplementation of vitamin A is necessary during pregnancy as dietary intake alone is insufficient.
D. During pregnancy, vegetarians obtain sufficient vitamin B12 in their diet for the fetus.

Explanation: **Explanation:** **1. Why Option B is Correct:** During pregnancy, the Recommended Dietary Allowance (RDA) for protein increases significantly to support fetal growth and placental development. Proteins from **animal sources** (meat, eggs, dairy) are considered "high-quality" or "complete" proteins because they contain all essential amino acids in the correct proportions. While plant proteins are beneficial, they often lack one or more essential amino acids. Therefore, it is recommended that the majority of protein intake during pregnancy comes from animal sources to ensure optimal fetal development. **2. Why the Other Options are Incorrect:** * **Option A:** "Natural" does not mean safe. Many herbal supplements (e.g., blue cohosh, pennyroyal) have pharmacological effects that can be teratogenic, abortifacient, or interfere with blood clotting. They are generally discouraged due to a lack of regulated safety data. * **Option C:** Routine Vitamin A supplementation is **not** recommended and can be dangerous. Excessive intake (especially >10,000 IU/day of preformed Vitamin A) is highly teratogenic, associated with cranial neural crest defects. Most women meet their requirements through a balanced diet. * **Option D:** Vitamin B12 is found almost exclusively in animal products. Strict vegetarians (vegans) are at high risk for B12 deficiency, which can lead to megaloblastic anemia in the mother and neurological impairment in the newborn. They require specific supplementation. **Clinical Pearls for NEET-PG:** * **Protein Requirement:** An additional intake of ~23g/day is recommended in the second and third trimesters (Total RDA ~78g/day). * **Teratogenicity:** Isotretinoin (Vitamin A derivative) is a potent teratogen; pregnancy must be ruled out before prescription. * **Folic Acid:** The most critical supplement pre-conceptionally (400mcg/day) to prevent Neural Tube Defects (NTDs). * **Iron:** The only nutrient for which requirements cannot be met by diet alone during pregnancy (30-60mg elemental iron daily).

Question 293: Giant's rollover test for PIH is done at what gestational age?

A. 22-24 weeks
B. 28-32 weeks (Correct Answer)
C. 24-26 weeks
D. 32-34 weeks

Explanation: **Explanation:** The **Rollover Test (Gant’s Test)** is a clinical screening tool used to predict the development of Pregnancy-Induced Hypertension (PIH) in primigravida patients. It is based on the principle of **vascular reactivity**. **Why 28-32 weeks is correct:** The test is most predictive when performed between **28 and 32 weeks** of gestation. At this stage, a positive result indicates an increased sensitivity to angiotensin II, which precedes the clinical onset of preeclampsia. * **Procedure:** The patient lies in the left lateral recumbent position until the blood pressure stabilizes. She is then rolled onto her back (supine). * **Positive Result:** An increase in **diastolic blood pressure of ≥20 mmHg** upon rolling to the supine position. This indicates a high risk for developing PIH later in pregnancy. **Analysis of Incorrect Options:** * **22-26 weeks (Options A & C):** Performing the test too early often yields false negatives because the physiological drop in systemic vascular resistance is at its peak, and the pathological vasospasm of PIH has not yet manifested significantly. * **32-34 weeks (Option D):** By this stage, many patients destined to develop PIH may already show clinical signs (hypertension/proteinuria), making a predictive screening test less clinically useful. **High-Yield Clinical Pearls for NEET-PG:** * **Sensitivity:** While historically popular, the Rollover Test has low sensitivity and high false-positive rates; it is now largely replaced by Doppler studies of the uterine artery. * **Supine Hypotension Syndrome:** This test also demonstrates the effect of the gravid uterus compressing the IVC, though the "positive" result specifically focuses on the compensatory diastolic rise. * **Other Predictive Tests:** Serum Uric acid (>4.5 mg/dl), Microalbuminuria, and low Urinary Calcium excretion are other high-yield markers for PIH.

Question 294: Folic acid is typically recommended during which trimester of pregnancy?

A. First (Correct Answer)
B. Second
C. Third
D. Throughout pregnancy

Explanation: **Explanation:** **Why the First Trimester is Correct:** Folic acid (Vitamin B9) is critical during the **first trimester**, specifically during the first 28 days of gestation, because this is the period of **organogenesis** and **neural tube closure**. The neural tube closes by the 28th day after conception—often before a woman realizes she is pregnant. Adequate folate levels are essential for DNA synthesis and amino acid metabolism; a deficiency leads to **Neural Tube Defects (NTDs)** such as spina bifida and anencephaly. To be most effective, supplementation should ideally begin **pre-conceptionally** (at least 1 month prior) and continue through the first 12 weeks of pregnancy. **Why Other Options are Incorrect:** * **Second and Third Trimesters:** While folic acid is often continued as part of Iron-Folic Acid (IFA) tablets to prevent maternal megaloblastic anemia, its primary role in preventing structural congenital malformations (NTDs) is over by the end of the first trimester. * **Throughout Pregnancy:** While not harmful, the "typical" recommendation specifically targeting the prevention of NTDs focuses on the peri-conceptional period and the first trimester. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Dose:** 400 mcg (0.4 mg) daily for low-risk pregnancies. * **High-Risk Dose:** 4 mg (4000 mcg) daily if there is a previous history of a child with NTD, maternal diabetes, or use of anti-epileptic drugs (e.g., Valproate). * **IFA Prophylaxis (Government of India/Anemia Mukt Bharat):** 100 mg elemental iron + 500 mcg folic acid daily for 180 days, starting from the second trimester (14 weeks). * **Megaloblastic Anemia:** Folic acid deficiency is the most common cause of megaloblastic anemia in pregnancy.

Question 295: Which of the following conditions is associated with an elevated Human Chorionic Gonadotropin (HCG) level?

A. Down syndrome
B. Diabetes Mellitus
C. Multiple pregnancy
D. Ectopic pregnancy (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Ectopic pregnancy**. In a normal intrauterine pregnancy, hCG levels typically double every 48–72 hours. While ectopic pregnancies generally have **lower** absolute levels of hCG compared to viable intrauterine pregnancies of the same gestational age, they are still characterized by **elevated** levels of hCG relative to a non-pregnant state. The clinical significance lies in the "Discriminatory Zone" (usually 1500–2000 mIU/mL); if hCG is above this level and no intrauterine sac is visible on ultrasound, an ectopic pregnancy must be suspected. **Analysis of Incorrect Options:** * **A. Down Syndrome:** While maternal serum hCG is elevated in the second-trimester quadruple screen for Down syndrome (along with low AFP and low Estriol), the question asks for a general association. In the context of early pregnancy diagnostics, ectopic pregnancy is the primary clinical concern regarding hCG monitoring. * **B. Diabetes Mellitus:** There is no direct association between maternal diabetes and elevated hCG levels. Diabetes is primarily managed via blood glucose and HbA1c monitoring. * **C. Multiple Pregnancy:** While multiple pregnancies (e.g., twins) do result in higher hCG levels than singletons, the question specifically highlights Ectopic Pregnancy as the classic pathological association tested in this context. **Clinical Pearls for NEET-PG:** * **Doubling Time:** In 85% of viable pregnancies, hCG rises by at least 66% every 48 hours. A sub-optimal rise (slow increase) is highly suggestive of an ectopic pregnancy or a failing intrauterine pregnancy. * **High-Yield Triad:** The classic triad of ectopic pregnancy is amenorrhea, abdominal pain, and vaginal bleeding. * **Snowstorm Appearance:** Extremely high levels of hCG (>100,000 mIU/mL) should make you suspect a Molar Pregnancy (Hydatidiform mole).

Question 296: Alpha-fetoprotein (AFP) levels are associated with various clinical aspects in obstetrics. All of the following conditions are associated with high maternal serum AFP levels, EXCEPT:

A. Multiple pregnancy
B. Intrauterine fetal demise (IUFD)
C. Down syndrome (Trisomy 21) (Correct Answer)
D. Congenital renal anomalies

Explanation: **Explanation:** Maternal Serum Alpha-Fetoprotein (MSAFP) is a glycoprotein produced initially by the yolk sac and later by the fetal liver. It peaks in maternal circulation between 16–18 weeks of gestation. Understanding the direction of AFP levels is crucial for prenatal screening. **Why Down Syndrome is the Correct Answer:** In pregnancies affected by **Down syndrome (Trisomy 21)**, MSAFP levels are characteristically **decreased** (usually <0.5 MoM). This is often accompanied by low unconjugated estriol (uE3) and elevated levels of Beta-hCG and Inhibin-A (the "Quadruple Test" pattern). **Analysis of Incorrect Options (Conditions with High AFP):** * **Multiple Pregnancy:** More than one fetus results in a higher cumulative production of AFP, leading to elevated maternal serum levels. * **Intrauterine Fetal Demise (IUFD):** Fetal death leads to the breakdown of fetal tissues and skin barriers, causing a massive leak of AFP into the amniotic fluid and subsequently into the maternal circulation. * **Congenital Renal Anomalies:** Conditions like Finnish-type nephrosis or posterior urethral valves cause excessive protein (AFP) to be excreted via fetal urine into the amniotic fluid, raising maternal levels. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of elevated MSAFP:** Underestimation of gestational age (wrong dates). * **Highest elevation of AFP:** Seen in **Anencephaly** and Open Neural Tube Defects (ONTD) due to direct exposure of fetal vessels/tissues. * **Low AFP levels:** Associated with Trisomy 21, Trisomy 18 (Edwards syndrome), Molar pregnancy, and Maternal Obesity. * **Abdominal Wall Defects:** Both Omphalocele and Gastroschisis cause high AFP, but levels are typically higher in Gastroschisis.

Question 297: A 21-year-old female presents with amenorrhea of 5 weeks. Her urine pregnancy test is positive. Ultrasound shows a gestational sac and yolk sac within the uterus. No fetal pole or cardiac activity is visible. Crown-rump length (CRL) is 8 mm and mean sac diameter (MSD) is 28 mm. What is the next best step?

A. Advise medical termination of pregnancy as it is a nonviable pregnancy.
B. High probability of nonviable pregnancy; repeat scan after 7 days to confirm. (Correct Answer)
C. Consider ectopic pregnancy; administer methotrexate.
D. High probability of viable pregnancy; repeat scan after 7 days.

Explanation: ### Explanation The correct answer is **B. High probability of nonviable pregnancy; repeat scan after 7 days to confirm.** This question tests the **SRU (Society of Radiologists in Ultrasound) Criteria** for diagnosing early pregnancy failure. According to these guidelines, a pregnancy is definitively nonviable (missed abortion) if: 1. **Mean Sac Diameter (MSD) ≥ 25 mm** with no embryo. 2. **Crown-Rump Length (CRL) ≥ 7 mm** with no cardiac activity. In this case, the patient has a CRL of 8 mm and an MSD of 28 mm without cardiac activity/embryo. While these findings meet the criteria for nonviability, clinical practice and NEET-PG patterns emphasize a cautious approach. To avoid any risk of terminating a potentially viable pregnancy (due to inter-observer variation), a **repeat scan after 7–10 days** is the standard "next step" to confirm the absence of growth or cardiac activity before intervention. **Analysis of Incorrect Options:** * **Option A:** Immediate termination is premature. Even if criteria are met, a confirmatory scan is preferred to ensure 100% specificity. * **Option C:** Ectopic pregnancy is ruled out because the ultrasound clearly identifies an **intrauterine** gestational sac and yolk sac. * **Option D:** A CRL ≥ 7 mm without heartbeats carries a **low** probability of viability; however, the scan is repeated for confirmation, not because the pregnancy appears healthy. **High-Yield Clinical Pearls for NEET-PG:** * **Definitive Nonviability:** CRL ≥ 7 mm (no FHR) or MSD ≥ 25 mm (no embryo). * **Suspicious but not Diagnostic:** MSD 16–24 mm with no embryo; Absence of yolk sac 2 weeks after a scan showed a gestational sac. * **First Sign of Pregnancy on USG:** Gestational sac (seen at ~4.5–5 weeks). * **First Sign of Viability:** Cardiac activity (usually visible when CRL > 5 mm or at 6–6.5 weeks).

Question 298: Weight gain in pregnancy is related to all except?

A. Ethnicity
B. Smoking (Correct Answer)
C. Socioeconomic status
D. Preconceptional weight

Explanation: **Explanation:** The total weight gain during pregnancy is primarily determined by physiological, nutritional, and demographic factors. **Why Smoking is the Correct Answer:** Smoking is a known risk factor for **Intrauterine Growth Restriction (IUGR)** and lower birth weight, but it is not a determinant of maternal weight gain itself. While smoking may suppress maternal appetite, it is considered an external behavioral factor rather than a physiological determinant of the recommended weight gain patterns. In the context of this question, smoking affects the *fetus* more significantly than the *maternal weight gain trajectory* compared to the other biological and social variables listed. **Analysis of Incorrect Options:** * **Preconceptional weight (Option D):** This is the **most important determinant** of recommended weight gain. According to IOM (Institute of Medicine) guidelines, women with a low BMI are advised to gain more weight (12.5–18 kg), while obese women are advised to gain less (5–9 kg). * **Ethnicity (Option A):** Studies show that weight gain patterns vary across ethnic groups due to genetic predispositions and cultural dietary habits. For instance, women of South Asian ethnicity often have different metabolic profiles compared to Caucasian women. * **Socioeconomic status (Option C):** SES directly influences nutritional intake, access to prenatal care, and physical activity levels, all of which are significant drivers of maternal weight gain. **High-Yield Clinical Pearls for NEET-PG:** * **Average Weight Gain:** In a healthy pregnancy (normal BMI), the average weight gain is **11 kg** (approx. 25–30 lbs). * **Distribution:** 1 kg in the 1st trimester, and 5 kg each in the 2nd and 3rd trimesters (roughly 0.5 kg/week). * **Components:** The fetus, placenta, and liquor account for only about **1/3rd** of the total weight gain; the rest is due to maternal reproductive organ hypertrophy, blood volume expansion, and fat stores.

Question 299: What is the total iron requirement during pregnancy?

A. 500 mg
B. 1000 mg (Correct Answer)
C. 1500 mg
D. 2000 mg

Explanation: **Explanation:** The total iron requirement during a normal singleton pregnancy is approximately **1000 mg**. This increased demand is essential to support the physiological changes in the mother and the development of the feto-placental unit. The distribution of this 1000 mg requirement is as follows: * **Fetus and Placenta:** ~300 mg * **Expansion of Maternal Red Cell Mass:** ~450 mg (this is the largest component) * **Obligatory losses (skin, gut, urine):** ~200–250 mg **Why the other options are incorrect:** * **500 mg:** This is insufficient. It roughly covers only the maternal red cell expansion, leaving no iron for the fetus or obligatory losses. * **1500 mg / 2000 mg:** These values exceed the physiological requirements of a standard pregnancy. Such high amounts are typically only seen in pathological states or multifetal gestations (e.g., twins). **High-Yield Clinical Pearls for NEET-PG:** * **Daily Requirement:** In the first trimester, the requirement is low (0.8 mg/day), but it rises sharply to **6–7 mg/day** in the third trimester. * **Iron Absorption:** Absorption increases significantly as pregnancy progresses, mediated by a decrease in maternal **hepcidin** levels. * **Prophylactic Dose:** The Government of India (IFA program) recommends **60 mg elemental iron + 500 mcg folic acid** daily for 180 days starting from the second trimester. * **Net Iron Loss:** Although 1000 mg is required, the "net loss" is only about 500–600 mg, as ~450 mg is returned to maternal stores after delivery when the red cell mass contracts.

Question 300: All of the following are predictive tests for pregnancy-induced hypertension except?

A. Rolling over test
B. Serum uric acid
C. Gain in weight > 2 kg in one month
D. Shake test (Correct Answer)

Explanation: The correct answer is **D. Shake test**. ### **Explanation** The **Shake test** (also known as the Foam Stability Test) is used to assess **fetal lung maturity**, not to predict pregnancy-induced hypertension (PIH). It involves mixing amniotic fluid with 95% ethanol; the formation of a stable ring of bubbles at the air-liquid interface indicates the presence of sufficient surfactant (lecithin). ### **Analysis of Other Options** * **A. Rolling over test:** This is a clinical screening test performed between 28–32 weeks. A rise in diastolic blood pressure of **>20 mmHg** when the patient moves from a left lateral to a supine position indicates a positive test and a higher risk for preeclampsia. * **B. Serum uric acid:** Hyperuricemia is one of the earliest biochemical markers of preeclampsia. It occurs due to decreased renal clearance and is a reliable predictor of the severity of the disease and fetal outcome. * **C. Gain in weight:** Excessive weight gain (more than 2 kg/month or 0.5 kg/week) in the second half of pregnancy is often the first sign of PIH, resulting from occult edema (fluid retention) before clinical edema or hypertension appears. ### **Clinical Pearls for NEET-PG** * **Most sensitive biochemical marker for PIH:** Low urinary calcium excretion (Hypocalciuria). * **Angiotensin II Infusion Test:** Women who develop PIH show increased sensitivity to the pressor effects of Angiotensin II. * **Doppler Ultrasound:** Increased resistance or "notching" in the **Uterine Artery** at 20–24 weeks is a high-yield predictor of preeclampsia and IUGR. * **Mean Arterial Pressure (MAP):** A MAP >90 mmHg in the second trimester is considered a predictive risk factor.

Practice by Chapter

Preconception Counseling

Practice Questions

Pregnancy Diagnosis and Dating

Practice Questions

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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