Prenatal Care — MCQs

Prenatal Care Indian Medical PG Practice Questions and MCQs

Question 271: Alpha-fetoprotein levels are increased in all conditions EXCEPT:

A. Open neural tube defects
B. Twin pregnancy
C. Down's syndrome (Correct Answer)
D. Intrauterine fetal demise

Explanation: **Explanation:** Alpha-fetoprotein (AFP) is a glycoprotein synthesized initially by the yolk sac and later by the fetal liver. It is the fetal equivalent of albumin. Understanding its levels is crucial for prenatal screening. **Why Down’s Syndrome is the Correct Answer:** In **Down’s Syndrome (Trisomy 21)**, maternal serum AFP (MSAFP) levels are characteristically **decreased** (usually <0.5 MoM). The exact mechanism is not fully understood, but it is attributed to reduced synthesis by the fetal liver and a smaller-than-normal yolk sac. This is a classic "Triple Test" finding, where AFP and Unconjugated Estriol (uE3) are low, while hCG and Inhibin-A are elevated. **Analysis of Incorrect Options:** * **Open Neural Tube Defects (NTDs):** Conditions like anencephaly or spina bifida aperta allow AFP to leak directly from the fetal circulation/CSF into the amniotic fluid and then into the maternal serum, causing **elevated** levels. * **Twin Pregnancy:** AFP levels are proportional to the number of fetuses. In multifetal gestations, the combined production leads to **increased** MSAFP. * **Intrauterine Fetal Demise (IUFD):** Fetal death leads to the breakdown of fetal tissues and increased permeability of the skin/placental barrier, causing a massive release of AFP into the maternal circulation. **NEET-PG High-Yield Pearls:** * **Most common cause of increased MSAFP:** Incorrect dating (underestimation of gestational age). * **Other causes of increased AFP:** Omphalocele, Gastroschisis, Turner syndrome (with cystic hygroma), and Renal anomalies (Finnish-type nephrosis). * **Other causes of decreased AFP:** Edwards syndrome (Trisomy 18), Molar pregnancy, and Maternal obesity. * **Optimal timing for MSAFP screening:** 15 to 20 weeks (ideal: 16–18 weeks).

Question 272: A 35-year-old primigravida presents for a regular antenatal checkup in her third trimester. She is upset due to the appearance of spidery veins on her face, upper chest, and arms. What is the next best course of action?

A. Perform liver function tests to rule out any liver disease.
B. Refer her to a dermatologist.
C. Refer her to a vascular surgeon for vein removal.
D. Reassurance is sufficient. (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Reassurance is sufficient.** The patient is presenting with **Spider Angiomata** (Spider Naevi), which are common, benign vascular changes seen during pregnancy. These lesions typically appear in the distribution of the superior vena cava (face, neck, upper chest, and arms). **1. Why Reassurance is the Correct Action:** Spider angiomata occur in approximately 70% of Caucasian and 10% of Black pregnant women, primarily due to **high circulating estrogen levels** which cause vascular proliferation and dilatation. Since these are physiological changes of pregnancy and usually **regress spontaneously** within three months postpartum, no medical or surgical intervention is required. **2. Why Other Options are Incorrect:** * **Option A:** While spider naevi are associated with liver cirrhosis in non-pregnant individuals, in a healthy pregnant woman without other symptoms, they are physiological. Routine LFTs are unnecessary. * **Option B & C:** Referral to a dermatologist or vascular surgeon is premature. These lesions are not pathological and typically disappear after delivery. Cosmetic procedures (like laser therapy) are only considered if they persist long after the puerperium. **Clinical Pearls for NEET-PG:** * **Vascular Changes in Pregnancy:** Other estrogen-induced changes include **Palmar Erythema** (mottled redness of the thenar and hypothenar eminences) and gingival hypertrophy (Epulis). * **Timing:** These changes usually appear in the second or third trimester. * **Differential:** Do not confuse these with *Varicose Veins* (lower limbs/vulva) or *Striae Gravidarum* (stretch marks), which have different etiologies. * **Key Fact:** If spider naevi appear in a male or a post-menopausal female, it should prompt an investigation for chronic liver disease.

Question 273: High multigravida is defined as a woman who has been pregnant for:

A. 3 times
B. 4 times
C. 5 times (Correct Answer)
D. 6 times

Explanation: **Explanation:** The classification of obstetric status based on the number of pregnancies is a fundamental concept in prenatal care. In clinical practice and standard textbooks (such as Williams Obstetrics and Dutta’s Textbook of Obstetrics), the definitions are as follows: * **Gravida:** Refers to the total number of times a woman has been pregnant, regardless of the outcome (including abortions and ectopic pregnancies). * **Multigravida:** A woman who has been pregnant more than once. * **Grand Multipara:** Traditionally, a woman who has given birth (parity) 5 or more times. * **High Multigravida:** Specifically defined as a woman who has been pregnant **5 times or more** (Gravida 5 and above). **Analysis of Options:** * **Option A (3 times) & B (4 times):** These are classified simply as multigravida. While they carry higher risks than a primigravida, they do not meet the threshold for the "High" or "Grand" designation. * **Option C (5 times):** This is the correct threshold. At this stage, the woman is at a significantly increased risk for obstetric complications. * **Option D (6 times):** While a woman pregnant 6 times is indeed a high multigravida, the definition begins at the **5th** pregnancy. **NEET-PG High-Yield Pearls:** 1. **Grand Multiparity Risks:** These patients are at high risk for **Postpartum Hemorrhage (PPH)** due to uterine atony, **Malpresentations** (due to a lax abdominal wall), **Placenta Previa**, and **Precipitate Labor**. 2. **Nulligravida:** A woman who has never been pregnant. 3. **Primigravida:** A woman pregnant for the first time. 4. **Elderly Primigravida:** A woman pregnant for the first time at age 35 or older.

Question 274: A couple with a child diagnosed with spina bifida presents for preconception counseling. What is the recurrence risk of spina bifida for this couple?

A. 3-5% (Correct Answer)
B. 5-10%
C. 10%
D. >10%

Explanation: Neural Tube Defects (NTDs), such as spina bifida and anencephaly, follow a **multifactorial inheritance** pattern. This means they result from a complex interaction between multiple genes and environmental factors (most notably folic acid deficiency). ### **Explanation of Options** * **Correct Option (A) 3-5%:** In multifactorial inheritance, the recurrence risk for a couple with one previously affected child is significantly higher than the general population risk (which is approximately 0.1-0.2%). For NTDs, the established recurrence risk after one affected sibling is **3% to 5%**. If two previous children are affected, the risk rises sharply to approximately **10%**. * **Incorrect Options (B, C, D):** These percentages (5-10% or >10%) overestimate the risk after only one affected child. A 10% risk is generally reserved for cases where there are two affected first-degree relatives. ### **High-Yield Clinical Pearls for NEET-PG** * **Folic Acid Prophylaxis:** * **Low Risk (General Population):** 0.4 mg (400 mcg) daily, starting 1 month before conception through the first trimester. * **High Risk (Previous child with NTD):** **4 mg (4000 mcg)** daily, starting at least 1–3 months before conception. This reduces the recurrence risk by approximately 70%. * **Screening:** Maternal Serum Alpha-Fetoprotein (MSAFP) is elevated in open NTDs. The ideal time for screening is **15–20 weeks** of gestation. * **Diagnosis:** Targeted Level II Ultrasound is the gold standard for diagnosing structural defects like spina bifida (look for the "lemon sign" and "banana sign" on cranial US).

Question 275: Fertilization typically occurs within what timeframe after ovulation?

A. 12 to 24 hours (Correct Answer)
B. 5 to 6 days
C. 8 to 12 days
D. More than 12 days

Explanation: **Explanation:** The correct answer is **A. 12 to 24 hours.** **Medical Concept:** Fertilization occurs when a sperm penetrates a mature oocyte, typically in the **ampulla** of the fallopian tube. The timeframe for fertilization is strictly governed by the biological lifespan of the gametes. After ovulation, the secondary oocyte remains viable and capable of being fertilized for only **12 to 24 hours**. If fertilization does not occur within this window, the oocyte begins to degenerate and is eventually phagocytosed. **Analysis of Incorrect Options:** * **B (5 to 6 days):** This timeframe corresponds to the period it takes for a fertilized zygote to travel down the fallopian tube and develop into a **blastocyst** ready for implantation. * **C (8 to 12 days):** This is the typical window for **implantation** into the endometrial lining (usually occurring 6–10 days after fertilization). * **D (More than 12 days):** By this time, in a non-pregnant cycle, the corpus luteum begins to regress, and the hormonal support for the endometrium declines, leading toward menstruation. **NEET-PG High-Yield Pearls:** * **Site of Fertilization:** Ampulla of the fallopian tube (most common site). * **Sperm Viability:** While the egg lasts 12–24 hours, spermatozoa can survive in the female reproductive tract for **48 to 72 hours**. * **Capacitation:** This is the functional maturation of sperm within the female reproductive tract, taking about **7 hours**, which is essential for fertilization. * **Zonal Reaction:** Once a single sperm penetrates the oocyte, the zona pellucida becomes impermeable to other sperm to prevent **polyspermy**.

Question 276: Increased alpha-fetoprotein (AFP) level is seen in which of the following conditions?

A. Down's syndrome
B. Molar pregnancy
C. Incorrect gestational age dating (Correct Answer)
D. Edward's syndrome

Explanation: **Explanation:** Maternal Serum Alpha-Fetoprotein (MSAFP) is a crucial screening biomarker produced initially by the yolk sac and later by the fetal liver. Understanding its fluctuations is high-yield for NEET-PG. **Why "Incorrect gestational age dating" is correct:** The most common cause of an abnormal MSAFP level (either high or low) is **incorrect estimation of gestational age**. AFP levels in maternal serum rise progressively until 30–32 weeks of gestation. If a pregnancy is further advanced than clinically estimated (e.g., 18 weeks instead of 16 weeks), the AFP level will appear "elevated" relative to the expected median for the documented date. **Analysis of Incorrect Options:** * **Down’s Syndrome (Trisomy 21):** Characterized by **decreased** MSAFP levels. The classic "Triple Test" profile for Down’s is low AFP, low Unconjugated Estriol (uE3), and high hCG. * **Edward’s Syndrome (Trisomy 18):** Typically presents with **decreased** levels of all three markers (AFP, uE3, and hCG). * **Molar Pregnancy:** Associated with **decreased** MSAFP levels because there is no functional fetal liver or yolk sac to produce the protein, while hCG levels are pathologically elevated. **Clinical Pearls for NEET-PG:** * **Causes of Increased MSAFP:** Open Neural Tube Defects (e.g., Anencephaly, Spina Bifida), Abdominal wall defects (Omphalocele, Gastroschisis), Multiple gestations, and Fetal demise. * **Next Step:** When an elevated MSAFP is detected, the immediate next step is an **Ultrasonography** to confirm gestational age, exclude twins, and check for fetal viability. * **Amniotic AFP:** If MSAFP is high and ultrasound is inconclusive, amniocentesis is done to check amniotic fluid AFP and **Acetylcholinesterase (AChE)** levels; elevated AChE is specific for open neural tube defects.

Question 277: What is the recommended daily dose of folic acid (in mcg) during pregnancy?

A. 100
B. 200
C. 400 (Correct Answer)
D. 800

Explanation: **Explanation:** **Correct Answer: C (400 mcg)** Folic acid (Vitamin B9) is essential for DNA synthesis and amino acid metabolism. During pregnancy, the requirement increases to support rapid cell division in the fetus and placenta. The standard recommendation for a **low-risk pregnancy** is **400 mcg (0.4 mg) daily**, ideally starting at least one month prior to conception and continuing through the first trimester. This dosage is proven to significantly reduce the incidence of **Neural Tube Defects (NTDs)** like spina bifida and anencephaly by ensuring proper closure of the neural tube, which occurs by the 28th day of gestation. **Analysis of Incorrect Options:** * **A & B (100-200 mcg):** These doses are insufficient to meet the physiological demands of pregnancy and do not provide adequate protection against NTDs. * **D (800 mcg):** While some prenatal vitamins contain this amount, it exceeds the standard WHO and GOI (Government of India) recommendation for low-risk women. **High-Yield Clinical Pearls for NEET-PG:** * **High-Risk Dosage:** Women with a previous history of a child with NTD, those on anti-epileptic drugs (e.g., Valproate), or those with pre-gestational diabetes require a higher dose of **4 mg (4000 mcg) daily**. * **Timing:** Folic acid is most effective when taken **pre-conceptionally**. * **Anemia Prophylaxis (GOI/IFA Guidelines):** Under the Anemia Mukt Bharat program, pregnant women are prescribed **60 mg of elemental iron and 500 mcg (0.5 mg) of folic acid** daily for 180 days, starting from the second trimester (14 weeks).

Question 278: Nullipara means:

A. Never completed a pregnancy to the stage of viability (Correct Answer)
B. 1 child with other dead
C. In labor
D. More than 3 children

Explanation: **Explanation:** The term **Nullipara** is derived from the Latin words *nullus* (none) and *parere* (to bring forth). In obstetric terminology, **Parity** refers to the number of pregnancies that have reached the point of **viability** (typically 24 weeks of gestation, though definitions vary by region), regardless of whether the infant was born alive or stillborn. 1. **Why Option A is Correct:** A nullipara is a woman who has **never** completed a pregnancy to the stage of viability. She may have been pregnant before (e.g., a nulliparous woman could have had multiple spontaneous abortions/miscarriages before 20-24 weeks), but none reached the threshold of viability. 2. **Why the other options are incorrect:** * **Option B:** A woman who has had one child reach viability is a **Primipara**, regardless of the child's current survival status. * **Option C:** A woman in labor is referred to as a **Parturient**. * **Option D:** A woman who has completed two or more pregnancies to viability is a **Multipara**. If she has completed five or more, she is a **Grand Multipara**. **High-Yield Clinical Pearls for NEET-PG:** * **Gravida vs. Para:** Gravida refers to the total number of times a woman has been pregnant, including the current one. Para refers only to the number of past pregnancies that reached viability. * **Nulligravida:** A woman who has never been pregnant. * **Primigravida:** A woman who is pregnant for the first time. * **The "Viability" Rule:** Multiple fetuses (twins/triplets) in a single pregnancy count as **one** parous event (P1) because parity refers to the *pregnancy episode*, not the number of fetuses.

Question 279: What is a known hazard of chorionic villus sampling (CVS)?

A. Limb abnormality
B. Spina bifida
C. Down's syndrome
D. Abortion (Correct Answer)

Explanation: **Explanation:** Chorionic Villus Sampling (CVS) is a prenatal diagnostic procedure performed between **10 and 13 weeks** of gestation to detect chromosomal or genetic disorders. **Why Abortion is the Correct Answer:** The most significant and well-documented procedure-related complication of CVS is **fetal loss (abortion)**. While the risk has decreased with ultrasound guidance and operator experience, the procedure-related miscarriage rate is approximately **0.5% to 1%** (slightly higher than amniocentesis). The risk is attributed to potential infection, membrane rupture, or placental trauma during the transcervical or transabdominal needle insertion. **Analysis of Incorrect Options:** * **Limb Abnormality (Option A):** While oromandibular limb hypogenesis syndrome was historically associated with CVS performed **before 9 weeks** of gestation, it is no longer considered a standard hazard when the procedure is performed during the recommended window (10–13 weeks). * **Spina Bifida (Option B):** CVS cannot diagnose or cause neural tube defects (NTDs) like spina bifida. NTDs are screened via maternal serum alpha-fetoprotein (MSAFP) and diagnosed via detailed ultrasound or amniocentesis (measuring amniotic fluid acetylcholinesterase). * **Down’s Syndrome (Option C):** CVS is a diagnostic tool used to *detect* Down’s syndrome (Trisomy 21); it is not a hazard or cause of the condition. **High-Yield NEET-PG Pearls:** * **Timing:** CVS is ideally performed at **10–13 weeks**. It is the earliest invasive diagnostic test available. * **Advantage over Amniocentesis:** Provides results earlier in pregnancy, allowing for safer termination if abnormalities are found. * **Disadvantage:** Unlike amniocentesis, CVS cannot detect neural tube defects and carries a small risk of **confined placental mosaicism**, which may require follow-up amniocentesis for confirmation. * **Rh Isoimmunization:** Rh-negative unsensitized mothers must receive **Anti-D immunoglobulin** following the procedure.

Question 280: Which of the following is NOT true regarding diabetes in pregnancy?

A. Glucose challenge test is done between 24-28 weeks.
B. A 50 gm oral glucose load is given as a screening test.
C. Insulin resistance decreases with pregnancy. (Correct Answer)
D. Diabetes control before conception is important to prevent malformations.

Explanation: **Explanation:** The correct answer is **C (Insulin resistance decreases with pregnancy)** because this statement is physiologically incorrect. Pregnancy is actually a **diabetogenic state** characterized by a progressive **increase in insulin resistance**, particularly in the second and third trimesters. This is primarily due to placental hormones such as **Human Placental Lactogen (hPL)**, cortisol, estrogen, and progesterone, which act as insulin antagonists to ensure a steady supply of glucose to the fetus. **Analysis of other options:** * **Option A & B:** The **Glucose Challenge Test (GCT)** is the standard screening tool. It involves a **50g oral glucose load** (non-fasting). If the 1-hour plasma glucose is ≥140 mg/dL, it is considered positive. The optimal timing is **24–28 weeks** because insulin resistance peaks during this period. * **Option D:** Pre-gestational diabetes is associated with a high risk of **congenital malformations** (e.g., Sacral agenesis, Cardiac defects). Strict glycemic control (HbA1c <6.5%) before conception is vital to reduce this risk during organogenesis. **High-Yield NEET-PG Pearls:** * **DIPSI Criteria:** A single-step 75g OGTT is often used in India; a 2-hour value ≥140 mg/dL diagnoses GDM. * **Most common malformation:** Ventricular Septal Defect (VSD). * **Most specific malformation:** Sacral Agenesis (Caudal Regression Syndrome). * **Drug of Choice:** Insulin remains the gold standard, though Metformin is increasingly used in specific clinical guidelines.

Practice by Chapter

Preconception Counseling

Practice Questions

Pregnancy Diagnosis and Dating

Practice Questions

Routine Antenatal Assessments

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Maternal Physiological Changes

Practice Questions

Nutrition in Pregnancy

Practice Questions

Screening Tests in Pregnancy

Practice Questions

Fetal Growth Assessment

Practice Questions

High-Risk Pregnancy Identification

Practice Questions

Antenatal Complications Management

Practice Questions

Psychosocial Aspects of Pregnancy

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