Prenatal Care Practice Questions

Q: What is the treatment of choice for a pregnant patient with gonorrhea presenting with white discharge?

Ceftriaxone plus azithromycin single dose. **Explanation:** The treatment of choice for gonorrhea in pregnancy is a combination therapy of **Ceftriaxone (250 mg IM single dose)** and **Azithromycin (1 g orally single dose)**. **1. Why Option B is Correct:** * **Dual Therapy:** Gonorrhea is frequently co-infected with *Chlamydia trachomatis*. To prevent treatment failure and cover both organisms, dual therapy is mandatory. * **Safety in Pregnancy:** Ceftriaxone (a third-generation cephalosporin) and Azithromycin (a macrolide) are both considered safe during pregnancy (Category B). **2. Why Other Options are Incorrect:** * **Option A:** Metronidazole is used for Trichomoniasis or Bacterial Vaginosis, not as a standard adjunct for Gonorrhea/Chlamydia unless specifically indicated. * **Option C:** While Doxycycline is a standard treatment for Chlamydia in non-pregnant adults, it is **contraindicated in pregnancy** due to the risk of fetal dental staining and bone growth inhibition. * **Option D:** Monotherapy with Ceftriaxone is no longer recommended due to the high prevalence of co-infection and the rising threat of antimicrobial resistance. **3. High-Yield Clinical Pearls for NEET-PG:** * **Syndromic Management:** In the WHO/NACO syndromic approach, "Vaginal Discharge" (Green/Yellow) is treated with Kit 2 (Secnidazole + Fluconazole), but confirmed Gonorrhea requires the Ceftriaxone + Azithromycin regimen. * **Neonatal Complication:** Untreated maternal gonorrhea can lead to *Ophthalmia Neonatorum*, which presents within 2–5 days of birth. * **Partner Treatment:** Always treat the sexual partner to prevent reinfection (Ping-pong infection). * **Test of Cure:** In pregnant patients, a test-of-cure is recommended 3–4 weeks after treatment.

Q: What is the recommended daily intake of folic acid during the first trimester of a normal pregnancy?

400 micrograms. **Explanation:** The correct answer is **400 micrograms (0.4 mg)**. Folic acid is a critical B-vitamin required for DNA synthesis and amino acid metabolism. During the first trimester, it is essential for the proper closure of the neural tube, which occurs by the 28th day of gestation. **Why Option B is correct:** For a **low-risk (normal) pregnancy**, the WHO and standard obstetric guidelines recommend a daily supplementation of **400 mcg (0.4 mg)** of folic acid. Ideally, this should start at least one month prior to conception (pre-conceptionally) and continue through the first 12 weeks of pregnancy to effectively prevent Neural Tube Defects (NTDs) like spina bifida and anencephaly. **Why the other options are incorrect:** * **Option A (100 mcg):** This dose is insufficient to provide the protective effect required to prevent NTDs. * **Options C & D (4 mg / 5 mg):** These are **high doses**. A 4 mg or 5 mg dose is reserved for **high-risk pregnancies**, including women with a previous history of a child with an NTD, women on anti-epileptic drugs (e.g., Valproate), or those with pre-gestational diabetes or BMI > 35. **NEET-PG High-Yield Pearls:** * **Timing:** Neural tube closure happens between days 22–28 post-conception. Since many women don't know they are pregnant then, pre-conceptional start is vital. * **High-Risk Dose:** 4 mg (or 5 mg in some guidelines) is the standard for secondary prevention (previous NTD). * **Anemia:** In India, under the Anemia Mukt Bharat program, pregnant women are given **60 mg elemental Iron + 500 mcg Folic Acid** daily starting from the second trimester (13 weeks) for 180 days.

Q: Genetic disorders are diagnosed at 11 weeks of pregnancy by?

Chorionic villous biopsy. **Explanation:** The correct answer is **Chorionic Villous Biopsy (CVS)**. **1. Why Chorionic Villous Biopsy (CVS) is correct:** CVS is the preferred invasive prenatal diagnostic test in the **first trimester**, typically performed between **10 and 13 weeks** of gestation. It involves taking a sample of the chorionic villi (placental tissue), which shares the same genetic makeup as the fetus. Because it can be performed earlier than other invasive tests, it allows for earlier diagnosis of chromosomal abnormalities (like Down Syndrome) or single-gene disorders, providing parents with earlier options for pregnancy management. **2. Why the other options are incorrect:** * **Amniocentesis:** This involves sampling amniotic fluid. It is traditionally performed in the **second trimester**, between **15 and 20 weeks**. Performing it before 14 weeks (early amniocentesis) is associated with higher risks of fetal loss and clubfoot (talipes equinovarus). * **Endometrial biopsy:** This is a gynecological procedure used to sample the uterine lining to investigate infertility or abnormal uterine bleeding; it is **contraindicated** in a known pregnancy. * **Placentography:** This is an obsolete radiological technique (X-ray) previously used to visualize the placenta. It is not used for genetic diagnosis. **High-Yield Clinical Pearls for NEET-PG:** * **Timing is Key:** CVS (10–13 weeks) vs. Amniocentesis (15–20 weeks). * **Risk of Limb Reduction:** If CVS is performed **before 9 weeks**, there is an increased risk of limb reduction defects. * **Mosaicism:** CVS has a 1–2% risk of "Confined Placental Mosaicism," where the placenta's genetic makeup differs from the fetus, sometimes requiring follow-up amniocentesis for confirmation. * **Procedure-related Loss:** The risk of miscarriage for both CVS and amniocentesis is now considered very low (approx. 0.1% to 0.5%) in experienced centers.

Q: What gestational sac diameter is suggestive of anembryonic pregnancy if an embryo is not visible?

20 mm. ### Explanation In early pregnancy, transvaginal ultrasonography (TVUS) is the gold standard for assessing viability. An **anembryonic pregnancy** (formerly known as a "blighted ovum") occurs when a gestational sac develops without a detectable embryo. **Why 20 mm is the correct answer:** According to standard obstetric guidelines (including the SRU criteria), a **Mean Sac Diameter (MSD) of ≥25 mm** without a visible embryo is definitive for pregnancy failure. However, in the context of NEET-PG and traditional textbooks like Williams Obstetrics, an **MSD of ≥20 mm** without an embryo (or yolk sac) is considered highly suggestive of anembryonic pregnancy. At this size, the absence of fetal poles indicates that the pregnancy is not progressing normally. **Analysis of Incorrect Options:** * **A (5 mm):** This is the size at which a gestational sac first becomes visible on TVUS (around 4.5–5 weeks). It is too early to expect an embryo. * **B (10 mm):** At this stage, a yolk sac should typically be visible, but the absence of an embryo is still considered normal. * **C (15 mm):** While a yolk sac should definitely be present, the absence of an embryo at 15 mm is suspicious but not yet diagnostic of failure. **High-Yield Clinical Pearls for NEET-PG:** * **Discriminatory Zone:** The hCG level at which a gestational sac should be seen (1500–2000 mIU/ml for TVUS; 6500 mIU/ml for TAS). * **Yolk Sac Rule:** If the MSD is **>8 mm**, a yolk sac should be visible. * **Cardiac Activity:** If the **Crown-Rump Length (CRL) is ≥7 mm**, fetal heart activity must be present; its absence confirms missed abortion. * **Growth Rate:** A normal gestational sac grows at approximately **1 mm per day**.

Q: Which of the following is the investigation of choice in a pregnant lady at 18 weeks of gestation with a past history of delivering a baby with Down's syndrome?

Amniocentesis. **Explanation:** The core concept here is the distinction between **screening** and **diagnostic** tests. A woman with a previous history of a child with Down’s syndrome is at a significantly higher risk for recurrence. In such high-risk scenarios, a definitive diagnosis is required rather than a probability-based screening. **Why Amniocentesis is correct:** Amniocentesis is the **investigation of choice (diagnostic test)** for chromosomal analysis at 18 weeks. It involves aspirating amniotic fluid to perform fetal karyotyping. It is typically performed between **15–20 weeks** of gestation. Since the patient is at 18 weeks, this is the most appropriate and safest invasive procedure available to confirm or rule out trisomy 21. **Why other options are incorrect:** * **Triple Screen Test:** This is a screening test (measuring AFP, hCG, and uE3). While it assesses risk, it does not provide a definitive diagnosis. In a patient with a known high-risk history, we bypass screening and proceed directly to diagnostic testing. * **Chorionic Villous Biopsy (CVS):** While diagnostic, CVS is ideally performed between **10–13 weeks**. At 18 weeks, the placenta is more developed, and the risk-to-benefit ratio favors amniocentesis. * **Ultrasonography:** USG can identify "soft markers" (like nuchal fold thickness), but it is not a definitive diagnostic tool for Down’s syndrome. **High-Yield Pearls for NEET-PG:** * **Gold Standard for Karyotyping:** Amniocentesis. * **Timing:** CVS (10–13 weeks); Amniocentesis (15–20 weeks); Cordocentesis (>20 weeks). * **Most common chromosomal abnormality** associated with increased maternal age/previous history: Trisomy 21 (Down’s Syndrome). * **Risk of miscarriage:** Amniocentesis carries a lower risk (~0.5%) compared to CVS (~1%).

Q: Chorionic villous sampling is useful in the diagnosis of all the following conditions except?

Spina bifida. **Explanation:** The correct answer is **Spina bifida**. **1. Why Spina bifida is the correct answer:** Chorionic Villous Sampling (CVS) involves obtaining a sample of placental tissue (chorionic villi) to analyze the fetal genome. It is used to detect **genetic, chromosomal, and metabolic disorders**. Spina bifida is a **Neural Tube Defect (NTD)**, which is a structural malformation, not a primary genetic sequence error. The diagnosis of NTDs relies on identifying elevated levels of **Alpha-fetoprotein (AFP)** in maternal serum or amniotic fluid, and visualization via **Targeted Ultrasonography**. Since CVS does not measure AFP levels, it cannot be used to diagnose Spina bifida. **2. Analysis of incorrect options:** * **Tay-Sachs disease:** This is an autosomal recessive lysosomal storage disorder. It can be diagnosed via CVS through DNA analysis or enzyme assay of the villi. * **Thalassemia:** As a single-gene disorder (hemoglobinopathy), it is diagnosed using DNA amplification (PCR) from the fetal cells obtained during CVS. * **Down syndrome:** This is a chromosomal aneuploidy (Trisomy 21). CVS allows for a full fetal karyotype or FISH analysis, making it a definitive diagnostic tool for chromosomal abnormalities. **3. NEET-PG High-Yield Pearls:** * **Timing:** CVS is typically performed between **10–13 weeks** of gestation (earlier than amniocentesis). * **Risk:** Performing CVS before 9 weeks is associated with **Limb Reduction Defects**. * **Advantage:** It provides earlier results compared to amniocentesis, allowing for safer first-trimester termination if necessary. * **Limitation:** It cannot detect NTDs and carries a small risk of **Confined Placental Mosaicism**, which may require follow-up amniocentesis.

Q: Which of the following is the most specific marker for Neural Tube Defects?

Acetylcholinesterase. **Explanation:** The correct answer is **Acetylcholinesterase (AChE)**. **1. Why Acetylcholinesterase is the Correct Answer:** While Alpha-fetoprotein (AFP) is the most common *screening* tool, **AChE is the most specific marker** for confirming Neural Tube Defects (NTDs). In a fetus with an open NTD (like anencephaly or open spina bifida), the fetal cerebrospinal fluid (CSF) leaks directly into the amniotic fluid. Since AChE is an enzyme found in high concentrations within the fetal central nervous system, its presence in the amniotic fluid (detected via amniocentesis and gel electrophoresis) is a definitive indicator of exposed neural tissue. **2. Analysis of Incorrect Options:** * **Alpha-fetoprotein (AFP):** This is highly sensitive but lacks specificity. Elevated levels are seen in NTDs, but also in abdominal wall defects (omphalocele/gastroschisis), multiple gestations, and fetal demise. It is used for screening, not definitive diagnosis. * **Pseudocholinesterase (Butyrylcholinesterase):** This is found in the liver and plasma. It is not a specific marker for neural tissue and does not help in diagnosing NTDs. * **Human Chorionic Gonadotropin (HCG):** This is a marker used in the "Triple" or "Quadruple" screen primarily to screen for chromosomal abnormalities like Down Syndrome (where HCG is elevated) or Edwards Syndrome (where HCG is decreased). **3. Clinical Pearls for NEET-PG:** * **Screening Sequence:** Maternal Serum AFP (MSAFP) $\rightarrow$ Ultrasound $\rightarrow$ Amniotic Fluid AFP $\rightarrow$ **Amniotic Fluid AChE (Gold Standard for confirmation).** * **False Positives:** If a sample is contaminated with fetal blood, AFP may be elevated, but the AChE test helps differentiate true NTDs from blood contamination. * **Folic Acid:** Supplementation (400mcg/day for low risk; 4mg/day for high risk) starting 1 month pre-conception reduces NTD incidence by 70%.

Question 1

What is the treatment of choice for a pregnant patient with gonorrhea presenting with white discharge?

Accepted Answer

Ceftriaxone plus azithromycin single dose

Answer

Ceftriaxone single dose intramuscular injection plus Metronidazole for 14 days

Answer

Ceftriaxone plus Doxycycline 100 mg for 7 days plus Metronidazole for 14 days

Answer

Ceftriaxone single dose intramuscular injection

Question 2

A 32-year-old G2P1 woman at 34 weeks' gestation presents with regular contractions, bloody show, and a gush of fluids. She delivers a 2.3 kg boy spontaneously 1 hour later. Twenty-four hours postpartum, the infant develops irritability, fever, and respiratory distress, diagnosed as sepsis secondary to pneumonia. Which prenatal test would have provided the most useful information in preventing this condition?

Accepted Answer

Rectovaginal Group B Streptococcus culture

Answer

Cervical Chlamydia culture

Answer

Cervical gonorrhea culture

Answer

Elisa for HIV

Question 3

What is the recommended daily intake of folic acid during the first trimester of a normal pregnancy?

Accepted Answer

400 micrograms

Answer

100 micrograms

Answer

4 mg

Answer

5 mg

Question 4

Genetic disorders are diagnosed at 11 weeks of pregnancy by?

Accepted Answer

Chorionic villous biopsy

Answer

Amniocentesis

Answer

Endometrial biopsy

Answer

Placentography

Question 5

What gestational sac diameter is suggestive of anembryonic pregnancy if an embryo is not visible?

Accepted Answer

20 mm

Answer

5 mm

Answer

10 mm

Answer

15 mm

Question 6

Which of the following is the investigation of choice in a pregnant lady at 18 weeks of gestation with a past history of delivering a baby with Down's syndrome?

Accepted Answer

Amniocentesis

Answer

Triple screen test

Answer

Chorionic villous biopsy

Answer

Ultrasonography

Question 7

A mother at 10 weeks of pregnancy has previously had a baby with an open neural tube defect. Which of the following statements is true?

Accepted Answer

Sodium valproate is associated with open neural tube defects.

Answer

The risk of recurrence is 10%.

Answer

Amniocentesis should be performed.

Answer

Administer multivitamins.

Question 8

Chorionic villous sampling is useful in the diagnosis of all the following conditions except?

Accepted Answer

Spina bifida

Answer

Tay-Sachs disease

Answer

Thalassemia

Answer

Down syndrome

Question 9

Regarding hemodynamic changes in pregnancy, which of the following is NOT true?

Accepted Answer

Hemodynamic changes start taking place after 12 weeks of gestation.

Answer

Venocaval compression begins at about 16 weeks of gestation.

Answer

There is a mid-trimester fall in blood pressure.

Answer

A systolic murmur may occur normally.

Question 10

Which of the following is the most specific marker for Neural Tube Defects?

Accepted Answer

Acetylcholinesterase

Answer

Pseudocholinesterase

Answer

Alpha fetoprotein (AFP)

Answer

Human chorionic Gonadotropin (HCG)

Prenatal Care — MCQs

Prenatal Care — MCQs

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