Prenatal Care Practice Questions

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

Amniocentesis for amniotic fluid. ### 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.

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

28-32 weeks. **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.

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

First. **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.

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

Ectopic pregnancy. **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).

Q: 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:

Down syndrome (Trisomy 21). **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.

Q: What is the total iron requirement during pregnancy?

1000 mg. **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.

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

Shake test. 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.

Question 1

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

Accepted Answer

Amniocentesis for amniotic fluid

Answer

Maternal blood for AFP levels

Answer

Chorionic villus sampling

Answer

Fetal blood sampling

Question 2

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?

Accepted Answer

During pregnancy, the majority of consumed protein should be supplied from animal sources.

Answer

Herbal medications are natural, so there is no reason to avoid these dietary supplements during pregnancy.

Answer

Routine supplementation of vitamin A is necessary during pregnancy as dietary intake alone is insufficient.

Answer

During pregnancy, vegetarians obtain sufficient vitamin B12 in their diet for the fetus.

Question 3

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

Accepted Answer

28-32 weeks

Answer

22-24 weeks

Answer

24-26 weeks

Answer

32-34 weeks

Question 4

Folic acid is typically recommended during which trimester of pregnancy?

Accepted Answer

First

Answer

Second

Answer

Third

Answer

Throughout pregnancy

Question 5

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

Accepted Answer

Ectopic pregnancy

Answer

Down syndrome

Answer

Diabetes Mellitus

Answer

Multiple pregnancy

Question 6

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:

Accepted Answer

Down syndrome (Trisomy 21)

Answer

Multiple pregnancy

Answer

Intrauterine fetal demise (IUFD)

Answer

Congenital renal anomalies

Question 7

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?

Accepted Answer

High probability of nonviable pregnancy; repeat scan after 7 days to confirm.

Answer

Advise medical termination of pregnancy as it is a nonviable pregnancy.

Answer

Consider ectopic pregnancy; administer methotrexate.

Answer

High probability of viable pregnancy; repeat scan after 7 days.

Question 8

Weight gain in pregnancy is related to all except?

Accepted Answer

Smoking

Answer

Ethnicity

Answer

Socioeconomic status

Answer

Preconceptional weight

Question 9

What is the total iron requirement during pregnancy?

Accepted Answer

1000 mg

Answer

500 mg

Answer

1500 mg

Answer

2000 mg

Question 10

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

Accepted Answer

Shake test

Answer

Rolling over test

Answer

Serum uric acid

Answer

Gain in weight > 2 kg in one month

Prenatal Care — MCQs

Prenatal Care — MCQs

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