Prenatal Care Practice Questions

Q: A 20-year-old woman, gravida 2, para 0, aboa 1, presents for a prenatal visit at 30 weeks gestation. Her previous ultrasound at 18 weeks confirmed a single fetus appropriate for dates. She reports good fetal movement and has gained 9 kg. Today, her fundal height measures 25 cm, and fetal heart sounds are heard in the right upper quadrant. An obstetric ultrasound reveals an amniotic fluid index (AFI) of 4 cm. Which of the following conditions is most likely associated with this scenario?

Renal agenesis. **Explanation:** The clinical presentation highlights a **lag in fundal height** (25 cm at 30 weeks) and an **Amniotic Fluid Index (AFI) of 4 cm**, which signifies **Oligohydramnios** (defined as AFI < 5 cm or single deepest pocket < 2 cm). **1. Why Renal Agenesis is Correct:** Fetal urine production is the primary source of amniotic fluid starting from the second trimester (around 16 weeks). In cases of **bilateral renal agenesis** (Potter sequence) or renal anomalies, the absence of fetal urine leads to severe oligohydramnios. This results in a smaller-than-expected uterus (lagging fundal height) and can cause fetal crowding, leading to malpresentations (e.g., fetal heart sounds in the upper quadrant suggesting breech). **2. Why Incorrect Options are Wrong:** * **A. Duodenal Atresia:** This condition prevents the fetus from swallowing amniotic fluid, leading to **Polyhydramnios** (AFI > 25 cm), not oligohydramnios. * **B. Open Spina Bifida:** While associated with various anomalies, it does not typically cause oligohydramnios unless there is associated renal dysfunction or premature rupture of membranes. * **C. Tracheoesophageal Fistula:** Similar to duodenal atresia, this impairs the fetal ability to swallow and process amniotic fluid, typically resulting in **Polyhydramnios**. **Clinical Pearls for NEET-PG:** * **Oligohydramnios Causes (DRIPPC):** **D**eath (fetal), **R**enal anomalies, **I**UGR, **P**rom (Premature Rupture of Membranes), **P**ost-term pregnancy, **C**hromosomal anomalies. * **Potter Sequence:** Bilateral renal agenesis → Oligohydramnios → Pulmonary hypoplasia, limb deformities, and flattened facies. * **Fundal Height:** A discrepancy of >3 cm between gestational age and symphysis-fundal height (SFH) warrants an ultrasound to rule out growth restriction or fluid abnormalities.

Q: What is the daily recommended dietary allowance for iodine during pregnancy?

220 mcg. **Explanation:** The correct answer is **220 mcg**. During pregnancy, the maternal requirement for iodine increases significantly due to three primary physiological changes: an increase in maternal thyroid hormone production (to maintain euthyroidism), the transfer of iodine to the fetus for fetal thyroid hormone synthesis (starting around 12 weeks), and an increase in renal iodine clearance. **Analysis of Options:** * **A. 75 mcg:** This is insufficient for any adult group and does not meet the minimum physiological requirement. * **B. 150 mcg:** This is the standard RDA for **non-pregnant adults** (men and non-lactating women). * **C. 220 mcg (Correct):** According to the WHO and the Institute of Medicine (IOM), this is the specific RDA for **pregnant women** to prevent maternal and fetal iodine deficiency. * **D. 500 mcg:** This exceeds the RDA and approaches the tolerable upper intake level. Excessive iodine can paradoxically cause fetal goiter and hypothyroidism (Wolff-Chaikoff effect). **NEET-PG High-Yield Pearls:** * **Lactation RDA:** The iodine requirement increases further during lactation to **290 mcg/day** to ensure adequate iodine content in breast milk. * **Fetal Impact:** Severe iodine deficiency is the most common preventable cause of **congenital hypothyroidism** and **Cretinism** (characterized by intellectual disability, deaf-mutism, and spastic diplegia). * **Neurological Development:** The most critical period for iodine-dependent brain development is the first and second trimesters. * **Goitrogens:** Substances like cabbage, cauliflower, and cassava can interfere with iodine uptake and should be monitored in iodine-deficient regions.

Q: The softening of the uterus with lateral implantation is called as?

Piskacek's sign. **Explanation:** The correct answer is **Piskacek's sign**. This clinical sign occurs during early pregnancy (usually around 7–10 weeks) due to the asymmetrical growth of the uterus. When the embryo implants laterally near one of the cornua (the junction of the fallopian tube and uterus), that specific area becomes soft and prominent, leading to a palpable bulge or "asymmetrical softening" of the uterus. **Analysis of Options:** * **Piskacek's sign (Correct):** Asymmetrical enlargement and softening of the uterus due to lateral implantation. * **Chadwick's sign:** A bluish discoloration of the cervix, vagina, and labia minora caused by increased vascularity (venous congestion). It is an early sign of pregnancy, typically appearing around 6–8 weeks. * **Hegar's sign:** Softening of the **isthmus** (the lower segment of the uterus). On bimanual examination, the upper body of the uterus and the cervix feel like two separate entities because the tissue between them is so soft. * **Goodell's sign:** Significant softening of the **vaginal portion of the cervix** (often described as feeling like the "lips" rather than the "tip of the nose"). **High-Yield Clinical Pearls for NEET-PG:** * **Palmer’s Sign:** Regular, rhythmic uterine contractions felt during a pelvic examination in early pregnancy (4–8 weeks). * **Osiander’s Sign:** Increased pulsation felt through the lateral vaginal fornices due to increased vascularity (8 weeks). * **Ladid’s Sign:** Softening of the anterior midline of the uterus at the cervico-uterine junction (6 weeks). * **Jacquemier’s Sign:** Another name for Chadwick’s sign (bluish discoloration of the vaginal mucosa).

Q: Which of the following can be prevented by addressing modifiable risk factors?

Smoking. **Explanation:** The core concept of this question lies in distinguishing between **modifiable** and **non-modifiable** risk factors in prenatal care. **Correct Option: D. Smoking** Smoking is a classic modifiable risk factor. It is a behavioral choice that can be ceased through counseling and intervention. In pregnancy, smoking is strongly associated with adverse outcomes such as Intrauterine Growth Restriction (IUGR), placental abruption, preterm labor, and Low Birth Weight (LBW). Addressing this factor directly improves maternal and fetal prognosis. **Incorrect Options:** * **A. Polyhydramnios:** This is a clinical condition (excess amniotic fluid) rather than a risk factor. While it can be associated with modifiable conditions like maternal diabetes, the polyhydramnios itself is a manifestation or complication, not a preventable risk factor in isolation. * **B. Diabetes Mellitus:** Type 1 Diabetes is autoimmune/genetic (non-modifiable). While Type 2 and Gestational Diabetes (GDM) have modifiable components (obesity/diet), the disease itself is a medical diagnosis. In the context of "preventable risk factors," behavioral habits like smoking are the primary focus. * **C. Twin Pregnancy:** This is a biological occurrence determined by genetics, maternal age, or assisted reproductive technologies (ART). It is not a modifiable risk factor that a patient can "stop" or "prevent" through lifestyle changes once conception occurs. **High-Yield Clinical Pearls for NEET-PG:** * **Smoking & Pregnancy:** It is the most important modifiable cause of adverse pregnancy outcomes. It causes vasoconstriction via nicotine and fetal hypoxia via carbon monoxide. * **Alcohol:** The only 100% preventable cause of intellectual disability in the newborn (Fetal Alcohol Syndrome). * **Folic Acid:** Supplementation (0.4mg/day) starting pre-conceptionally is a modifiable intervention to prevent Neural Tube Defects (NTDs).

Q: A married middle-aged female gives a history of repeated abortions for the past 5 years. The given below is a prenatal karyogram from one of her conceptions. This karyogram suggests which of the following?

Down's syndrome. ***Down's syndrome*** - The karyogram shows **47 chromosomes with trisomy 21**, characteristic of Down's syndrome, which can lead to **spontaneous abortions** in early pregnancy. - **Advanced maternal age** increases the risk of nondisjunction during meiosis, resulting in chromosomal abnormalities like trisomy 21. *Klinefelter's syndrome* - This condition shows a **47,XXY karyotype** with an extra X chromosome, not an extra autosome like chromosome 21. - Primarily affects **males** and is associated with **hypogonadism** and **infertility**, not recurrent abortions in females. *Turner's syndrome* - Characterized by a **45,X karyotype** with a missing X chromosome, resulting in **monosomy**. - Affects **females** with features like **short stature** and **ovarian dysgenesis**, but shows chromosome loss, not gain. *Patau's syndrome* - Results from **trisomy 13** showing **47 chromosomes with an extra chromosome 13**, not chromosome 21. - Associated with severe **intellectual disability** and **multiple congenital anomalies**, with most cases resulting in early death.

Q: Which of the following ultrasound features identified during the second trimester is NOT a marker of Down syndrome?

Choroid plexus cyst. **Explanation:** The correct answer is **B. Choroid plexus cyst**. In prenatal screening, ultrasound "soft markers" are used to assess the risk of chromosomal abnormalities. While a **Choroid plexus cyst (CPC)** is a classic soft marker, it is strongly and specifically associated with **Trisomy 18 (Edwards Syndrome)**, not Trisomy 21 (Down Syndrome). In the absence of other structural anomalies, an isolated CPC carries a very low risk for Down syndrome. **Analysis of other options:** * **Single Umbilical Artery (SUA):** While often isolated, SUA is associated with various aneuploidies, including Trisomy 21, 18, and 13. * **Diaphragmatic Hernia:** Though more common in Trisomy 18, it is a documented structural association with Down syndrome. * **Duodenal Atresia:** This is a **highly specific** marker for Down syndrome. Approximately 30% of fetuses with duodenal atresia have Trisomy 21, often visualized on ultrasound as the "double bubble" sign. **High-Yield NEET-PG Pearls:** * **Most sensitive marker for Down Syndrome (2nd Trimester):** Increased Nuchal Fold thickness (≥ 6 mm). * **Most specific marker for Down Syndrome:** Duodenal atresia. * **Other common markers:** Echogenic intracardiac focus (EIF), pyelectasis, short femur/humerus, and hyperechoic bowel. * **Trisomy 18 markers:** Choroid plexus cysts, clenched fists (overlapping fingers), rocker-bottom feet, and micrognathia.

Q: Which of the following tests on maternal serum is most useful in distinguishing between open neural tube defects and ventral wall defects?

Pseudocholinesterase. **Explanation:** The correct answer is **Acetylcholinesterase (AChE)**, often referred to in clinical contexts and exams as **Pseudocholinesterase** (though specifically, the amniotic fluid/serum isoform of interest is AChE). **Why it is the correct answer:** Both open neural tube defects (ONTDs) and ventral wall defects (like gastroschisis or omphalocele) lead to an elevation of **Alpha-fetoprotein (AFP)** in maternal serum and amniotic fluid because fetal proteins leak through the exposed surface. However, AFP cannot distinguish between the two. **Acetylcholinesterase** is an enzyme localized primarily in neural tissue. In cases of ONTDs, the exposed neural tissue allows this enzyme to leak into the amniotic fluid and subsequently into maternal circulation. It is **not** elevated in ventral wall defects, making it the highly specific "confirmatory" marker to differentiate between the two. **Analysis of Incorrect Options:** * **A. Carcinoembryogenic antigen (CEA):** This is a tumor marker primarily used for colorectal and GI malignancies; it has no role in prenatal screening for structural defects. * **B. Sphingomyelin:** This is a phospholipid used in the **L/S ratio** (Lecithin/Sphingomyelin) to assess fetal lung maturity, not structural malformations. * **C. Alpha-fetoprotein (AFP):** While AFP is the initial screening test for both ONTDs and ventral wall defects, it lacks the specificity to distinguish between them. **NEET-PG High-Yield Pearls:** * **Best initial screening test for ONTD:** Maternal Serum AFP (MSAFP) at 15–20 weeks. * **Most specific test for ONTD:** Amniotic fluid Acetylcholinesterase (AChE). * **Common cause of elevated MSAFP:** Underestimation of gestational age (most common), multiple gestations, and ONTDs. * **Low MSAFP:** Associated with Down Syndrome (Trisomy 21).

Q: Which of the following evaluation methods is most sensitive in diagnosing pregnancy early?

Serum pregnancy test. **Explanation:** The diagnosis of pregnancy relies on identifying the presence of Human Chorionic Gonadotropin (hCG) or direct visualization of the fetus. **1. Why Serum Pregnancy Test is Correct:** The serum pregnancy test (measuring the β-subunit of hCG) is the most sensitive method because it can detect pregnancy as early as **8 to 11 days after conception** (or roughly 3 weeks after the Last Menstrual Period). Serum tests can detect hCG levels as low as **2–5 mIU/mL**, whereas urine tests typically require 20–50 mIU/mL. This biochemical detection precedes any clinical or radiological signs. **2. Why Other Options are Incorrect:** * **Abdominal Ultrasound:** A gestational sac is typically visible via transabdominal ultrasound only when the hCG level reaches **6,500 mIU/mL** (around 6 weeks). Even Transvaginal Ultrasound (TVS), which is more sensitive, requires a discriminatory zone of **1,500–2,000 mIU/mL** (around 4.5–5 weeks). * **Doppler Fetal Heart Tones:** Fetal heart sounds can be detected by handheld Doppler at approximately **10–12 weeks** of gestation, making it a much later diagnostic tool. * **Bimanual Examination:** Physical signs like Hegar’s sign or uterine enlargement are subjective and generally not apparent until **6–8 weeks** of gestation. **Clinical Pearls for NEET-PG:** * **hCG Doubling Time:** In a healthy intrauterine pregnancy, serum β-hCG levels double every **48 hours** during the first trimester. * **First Sign on USG:** The **Gestational Sac** is the first evidence of pregnancy on ultrasound. * **Definitive Diagnosis:** The presence of a **Fetal Pole with Cardiac Activity** is the most definitive sign of a live pregnancy.

Question 1

A 20-year-old woman, gravida 2, para 0, aboa 1, presents for a prenatal visit at 30 weeks gestation. Her previous ultrasound at 18 weeks confirmed a single fetus appropriate for dates. She reports good fetal movement and has gained 9 kg. Today, her fundal height measures 25 cm, and fetal heart sounds are heard in the right upper quadrant. An obstetric ultrasound reveals an amniotic fluid index (AFI) of 4 cm. Which of the following conditions is most likely associated with this scenario?

Accepted Answer

Renal agenesis

Answer

Duodenal atresia

Answer

Open spina bifida

Answer

Tracheoesophageal fistula

Question 2

Many professional organizations recommend that all pregnant women be routinely counseled about HIV infection and be encouraged to be tested. What is the most important reason for early identification of HIV infection in pregnant women?

Accepted Answer

Zidovudine therapy can be offered to reduce the chance of transmission of HIV to the newborn.

Answer

A cesarean section can be planned to reduce HIV transmission to the newborn.

Answer

Breast feeding can be discouraged to reduce transmission to the newborn.

Answer

Early identification of a newborn at risk of HIV infection will improve survival.

Question 3

What is the daily recommended dietary allowance for iodine during pregnancy?

Accepted Answer

220 mcg

Answer

75 mcg

Answer

150 mcg

Answer

500 mcg

Question 4

The softening of the uterus with lateral implantation is called as?

Accepted Answer

Piskacek's sign

Answer

Chadwick's sign

Answer

Hegar's sign

Answer

Goodell's sign

Question 5

Which of the following can be prevented by addressing modifiable risk factors?

Accepted Answer

Smoking

Answer

Polyhydramnios

Answer

Diabetes mellitus

Answer

Twin pregnancy

Question 6

A married middle-aged female gives a history of repeated abortions for the past 5 years. The given below is a prenatal karyogram from one of her conceptions. This karyogram suggests which of the following?

Accepted Answer

Down's syndrome

Answer

Klinefelter's syndrome

Answer

Turner's syndrome

Answer

Patau's syndrome

Question 7

Which of the following ultrasound features identified during the second trimester is NOT a marker of Down syndrome?

Accepted Answer

Choroid plexus cyst

Answer

Single umbilical artery

Answer

Diaphragmatic hernia

Answer

Duodenal atresia

Question 8

A 42-year-old primigravida presents to your office for a routine OB visit at 34 weeks gestational age. She voices concern because she has noticed an increasing number of spidery veins appearing on her abdomen. She is upset with the unsightly appearance of these veins and wants to know what you recommend to get rid of them. How do you advise this patient?

Accepted Answer

Inform her that the appearance of these blood vessels is a normal occurrence with pregnancy and will resolve spontaneously after delivery.

Answer

Refer her to a vascular surgeon to have the veins removed.

Answer

Order liver function tests, as this may indicate serious liver disease.

Answer

Refer her to a dermatologist for further workup and evaluation.

Question 9

Which of the following tests on maternal serum is most useful in distinguishing between open neural tube defects and ventral wall defects?

Accepted Answer

Pseudocholinesterase

Answer

Carcinoembryogenic antigen

Answer

Sphingomyelin

Answer

Alpha-feto protein

Question 10

Which of the following evaluation methods is most sensitive in diagnosing pregnancy early?

Accepted Answer

Serum pregnancy test

Answer

Detection of fetal heart tones by Doppler equipment

Answer

Abdominal ultrasound

Answer

Bimanual examination to assess uterine size

Prenatal Care — MCQs

Prenatal Care — MCQs

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