Prenatal Care — MCQs
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All of the following are considered as high-risk pregnancy except?
A 28-year-old G1P0 presents at 18 weeks gestational age with right-sided groin pain, described as sharp and occurring with movement and exercise. She denies any changes in urinary or bowel habits, fever, or chills. A heating pad helps alleviate the discomfort. What is the most likely etiology of this pain?
A woman attends the antenatal clinic with a period of amenorrhea of 10 weeks and a history of exposure to rubella infection. Her immune status is not known. What is the next step in management?
Mr. and Mrs. Annadurai have a 2-month-old baby with Down syndrome. Karyotype of Mrs. Annadurai shows a translocation variety of Down syndrome. Which of the following investigations will you advise to the parents before their next pregnancy?
Estimation of maternal serum alpha-fetoprotein helps in the diagnosis of all the following conditions EXCEPT:
Periconceptional use of which of the following agents leads to a reduced incidence of neural tube defects?
What is the drug of choice for syphilis in pregnancy?
At what gestational age is amniocentesis typically performed?
Which investigation modality can diagnose gestational diabetes in a primigravida?
Earliest diagnosis of pregnancy can be established safely by?
Prenatal Care Indian Medical PG Practice Questions and MCQs
Question 101: All of the following are considered as high-risk pregnancy except?
- A. Elderly primi (30 years and over)
- B. Short-statured primi (150 cm and below) (Correct Answer)
- C. History of previous cesarean or instrumental delivery
- D. Prolonged pregnancy (14 days after expected date of delivery)
Explanation: In prenatal care, a **high-risk pregnancy** is one where the mother, fetus, or newborn is at increased risk of adverse outcomes. ### Why Option B is the Correct Answer The standard clinical definition for a "short-statured primi" in the context of high-risk screening is a height of **140 cm (4'7") or below**, not 150 cm. While a woman measuring 150 cm is relatively short, she is not automatically categorized as "high-risk" unless other complications exist. A height of $\leq$ 140 cm is a significant risk factor because it is strongly associated with a **contracted pelvis**, increasing the risk of Cephalopelvic Disproportion (CPD) and obstructed labor. ### Analysis of Other Options * **A. Elderly Primi ($\geq$ 30 years):** Women embarking on their first pregnancy at age 30 or older are high-risk due to increased incidences of pre-eclampsia, gestational diabetes, chromosomal abnormalities (like Down Syndrome), and uterine fibroids. * **C. Previous Cesarean/Instrumental Delivery:** These patients are at risk for uterine rupture (in the case of prior C-section) or recurrent mechanical issues that necessitated instrumental intervention previously. * **D. Prolonged Pregnancy:** A pregnancy extending 14 days beyond the EDD (Post-term, $\geq$ 42 weeks) is high-risk due to **placental insufficiency**, oligohydramnios, and meconium aspiration syndrome. ### NEET-PG High-Yield Pearls * **Short Stature Cut-off:** Always remember the **140 cm** threshold for high-risk categorization in Indian guidelines. * **Age Extremes:** Both "Teenage Primi" ($<$ 18 years) and "Elderly Primi" ($\geq$ 30 years) are considered high-risk. * **The "Rule of Too":** Too young, too old, too many (grand multipara), and too soon (short birth interval) all define high-risk status.
Question 102: A 28-year-old G1P0 presents at 18 weeks gestational age with right-sided groin pain, described as sharp and occurring with movement and exercise. She denies any changes in urinary or bowel habits, fever, or chills. A heating pad helps alleviate the discomfort. What is the most likely etiology of this pain?
- A. Round ligament pain (Correct Answer)
- B. Appendicitis
- C. Kidney stone
- D. Urinary tract infection
Explanation: **Explanation:** **1. Why Round Ligament Pain is correct:** Round ligament pain is a common, benign cause of pelvic discomfort during the second trimester (typically 16–20 weeks). As the uterus grows, the round ligaments (which extend from the uterine horns to the labia majora via the inguinal canal) undergo significant stretching and hypertrophy. Sudden movements, exercise, or changes in position cause these ligaments to contract or pull on nearby nerve fibers, resulting in **sharp, stabbing, or "pulling" pain** in the lower quadrants or groin. The absence of systemic symptoms (fever) and relief with heat or rest are classic diagnostic features. **2. Why the other options are incorrect:** * **Appendicitis:** While the appendix is displaced upward during pregnancy, appendicitis typically presents with persistent, worsening pain, anorexia, nausea, and fever. It would not be transient or relieved by simple heat. * **Kidney Stone (Nephrolithiasis):** This usually presents with colicky, excruciating flank pain radiating to the groin, often accompanied by hematuria. * **Urinary Tract Infection (UTI):** UTIs in pregnancy typically present with frequency, urgency, dysuria, or suprapubic pain. The patient specifically denied urinary habit changes. **Clinical Pearls for NEET-PG:** * **Anatomy:** The round ligament is a remnant of the **gubernaculum**. * **Location:** Pain is more common on the **right side** due to the physiological **dextrorotation** of the uterus. * **Management:** Reassurance, pelvic tilts, and warm compresses. * **Differential Diagnosis:** Always rule out preterm labor if the pain is rhythmic or associated with vaginal bleeding/discharge.
Question 103: A woman attends the antenatal clinic with a period of amenorrhea of 10 weeks and a history of exposure to rubella infection. Her immune status is not known. What is the next step in management?
- A. Administer acyclovir if the mother develops symptoms of rubella
- B. Administer immunoglobulin to the mother
- C. Advise termination of pregnancy if she contacts rubella
- D. Test maternal serum for rubella-specific IgG and IgM antibodies immediately and after 3 weeks (Correct Answer)
Explanation: ### Explanation The management of rubella exposure in pregnancy depends on determining the mother's immune status and confirming whether an acute infection has occurred. Since the patient's immune status is unknown, the primary goal is to identify seroconversion. **Why Option D is Correct:** The first step is to test for **Rubella-specific IgG and IgM antibodies**. 1. **IgG positive/IgM negative:** Indicates past immunity; the fetus is safe. 2. **IgG negative/IgM negative:** Indicates susceptibility. A repeat test is required after **3 weeks** to check for seroconversion (rising IgG or appearance of IgM). If the second test remains negative, the mother did not contract the infection. 3. **IgM positive:** Suggests a recent primary infection, posing a high risk of **Congenital Rubella Syndrome (CRS)**, especially in the first trimester. **Why Other Options are Incorrect:** * **Option A:** Acyclovir is an antiviral used for Herpes Simplex or Varicella, not Rubella. There is no specific antiviral therapy for Rubella. * **Option B:** Immunoglobulins may prolong the incubation period or mask symptoms but do not reliably prevent maternal infection or fetal transmission. They are only considered if the mother refuses termination after confirmed exposure. * **Option C:** Termination is a major decision and is only discussed *after* confirming an acute primary infection in early pregnancy. It is not advised based on exposure alone. **High-Yield Clinical Pearls for NEET-PG:** * **Risk of Fetal Infection:** Highest in the first trimester (up to 80-90% before 11 weeks). Risk becomes negligible after 16–20 weeks. * **Gregg’s Triad (CRS):** Cataract, Sensorineural hearing loss (most common), and Cardiac defects (PDA/Pulmonary artery stenosis). * **Vaccination:** Rubella vaccine (RA 27/3) is a **live attenuated vaccine** and is contraindicated during pregnancy. Women should avoid pregnancy for 1 month (28 days) after vaccination.
Question 104: Mr. and Mrs. Annadurai have a 2-month-old baby with Down syndrome. Karyotype of Mrs. Annadurai shows a translocation variety of Down syndrome. Which of the following investigations will you advise to the parents before their next pregnancy?
- A. Triple test
- B. Alpha-fetoprotein
- C. Karyotyping (Correct Answer)
- D. Beta-human chorionic gonadotropin (hCG)
Explanation: ### Explanation **Why Karyotyping is the Correct Answer:** The scenario describes a case of **Translocation Down Syndrome**. Unlike Trisomy 21 (nondisjunction), which is usually sporadic and related to maternal age, translocation Down syndrome can be inherited from a phenotypically normal parent who is a **balanced translocation carrier**. If Mrs. Annadurai has a translocation variety, there is a significant risk of recurrence in future pregnancies. To provide accurate genetic counseling and determine the specific recurrence risk (e.g., 10–15% if the mother is a carrier of a 14;21 translocation, or 100% if a parent carries a 21;21 translocation), **Karyotyping of both parents** is the essential first step before the next pregnancy. This identifies if either parent is a carrier of the balanced translocation. **Why Other Options are Incorrect:** * **Triple Test (A), Alpha-fetoprotein (B), and Beta-hCG (D):** These are components of **maternal serum screening** performed *during* pregnancy (typically between 15–20 weeks). While they help screen for Down syndrome in a current fetus, they cannot identify a parental carrier state or provide pre-conceptional risk assessment. **Clinical Pearls for NEET-PG:** * **Trisomy 21 Etiology:** 95% are due to Nondisjunction (risk increases with maternal age); 3–4% are due to Robertsonian Translocation (independent of maternal age); 1% are Mosaicism. * **Recurrence Risk:** If a previous child had Trisomy 21 (nondisjunction), the recurrence risk is ~1%. If a parent is a translocation carrier, the risk is significantly higher. * **Most Common Translocation:** The most frequent translocation in Down syndrome is **t(14;21)**. * **Pre-conceptional Counseling:** Always prioritize parental karyotyping when a structural chromosomal abnormality is identified in a proband (the affected child).
Question 105: Estimation of maternal serum alpha-fetoprotein helps in the diagnosis of all the following conditions EXCEPT:
- A. Tracheoesophageal fistula
- B. Spina bifida
- C. Fetal hepatitis (Correct Answer)
- D. Anencephaly
Explanation: **Explanation:** Maternal Serum Alpha-Fetoprotein (MSAFP) is a glycoprotein produced initially by the yolk sac and later by the fetal liver. It enters the amniotic fluid via fetal urine and crosses into the maternal circulation. **Why Fetal Hepatitis is the correct answer:** While MSAFP is produced in the fetal liver, **fetal hepatitis** does not typically cause an elevation in maternal serum levels. MSAFP screening is primarily used to detect structural defects where fetal proteins "leak" into the amniotic fluid or conditions where placental permeability is altered. In hepatitis, the liver cells are inflamed, but there is no open defect or increased leakage mechanism to elevate MSAFP levels in the mother. **Analysis of Incorrect Options:** * **Spina Bifida & Anencephaly:** These are Neural Tube Defects (NTDs). In "open" NTDs, the absence of skin covering allows AFP to leak directly from the fetal serum/CSF into the amniotic fluid, leading to significantly elevated MSAFP. * **Tracheoesophageal Fistula (TEF):** This is associated with elevated MSAFP because the fetus cannot swallow amniotic fluid normally (impaired digestion/processing of AFP), leading to its accumulation in the amniotic sac and subsequent rise in maternal serum. **NEET-PG High-Yield Pearls:** * **Elevated MSAFP (>2.5 MoM):** Neural tube defects (Anencephaly, Spina bifida), Abdominal wall defects (Omphalocele, Gastroschisis), Multiple gestations, and Renal anomalies (Finnish-type nephrosis). * **Decreased MSAFP:** Down Syndrome (Trisomy 21), Edwards Syndrome (Trisomy 18), and Gestational Trophoblastic Disease. * **Most common cause of elevated MSAFP:** Incorrect dating (underestimation of gestational age). * **Timing:** Optimal screening is performed between **15–20 weeks** of gestation.
Question 106: Periconceptional use of which of the following agents leads to a reduced incidence of neural tube defects?
- A. Folic acid (Correct Answer)
- B. Iron
- C. Calcium
- D. Vitamin A
Explanation: **Explanation:** **Correct Option: A. Folic Acid** Folic acid (Vitamin B9) is a critical co-factor in DNA synthesis and the methylation cycle. During the first 28 days of gestation (often before a woman knows she is pregnant), the neural tube closes. Adequate periconceptional folate levels are essential for proper neurulation; deficiency leads to failure of the neural tube to close, resulting in defects like **Anencephaly** or **Spina Bifida**. Clinical trials (notably the MRC Vitamin Study) have conclusively proven that folic acid supplementation reduces the incidence of first-time NTDs by approximately 70%. **Incorrect Options:** * **B. Iron:** Essential for preventing maternal anemia and ensuring fetal oxygenation, but it has no structural role in neural tube formation. * **C. Calcium:** Vital for fetal skeletal mineralization and preventing maternal pre-eclampsia, but not linked to NTDs. * **D. Vitamin A:** While necessary for vision and immunity, excessive intake (Retinoids) is actually **teratogenic**, causing craniofacial and cardiac defects. **High-Yield NEET-PG Pearls:** 1. **Dosage:** * **Low risk:** 400 mcg (0.4 mg) daily, starting 1 month before conception through the first trimester. * **High risk** (previous child with NTD, mother on anticonvulsants, or diabetic): 4 mg (4000 mcg) daily. 2. **Timing:** Must be "Periconceptional" because the neural tube closes by the **4th week** of post-conception (Day 28). 3. **Diagnosis:** Maternal Serum Alpha-Fetoprotein (MSAFP) is elevated in open NTDs. 4. **Antiepileptics:** Valproate and Carbamazepine are notorious for causing NTDs by interfering with folate metabolism.
Question 107: What is the drug of choice for syphilis in pregnancy?
- A. Erythromycin
- B. Azithromycin
- C. Penicillin (Correct Answer)
- D. Cephalosporin/ceftriaxone
Explanation: **Explanation:** **1. Why Penicillin is the Correct Answer:** Parenteral **Benzathine Penicillin G** is the gold standard and the only recommended treatment for syphilis in pregnancy. It is highly effective at treating maternal infection and, crucially, it is the only antibiotic known to reliably cross the placenta in therapeutic concentrations to treat the fetus and prevent **Congenital Syphilis**. For early syphilis, a single IM dose is used; for late latent or syphilis of unknown duration, three weekly doses are required. **2. Why Other Options are Incorrect:** * **Erythromycin (A) & Azithromycin (B):** While macrolides were used in the past, they are no longer recommended because they **do not cross the placental barrier** effectively. They may treat the mother but fail to treat the fetus, leading to a high risk of congenital syphilis. Additionally, resistance to Azithromycin is increasing. * **Cephalosporins/Ceftriaxone (D):** While Ceftriaxone has some efficacy against *T. pallidum*, it is not considered the drug of choice because there is insufficient data regarding the optimal dose and duration for preventing congenital syphilis compared to Penicillin. **3. NEET-PG High-Yield Pearls:** * **Penicillin Allergy:** If a pregnant woman is allergic to penicillin, the management is **Skin Testing followed by Desensitization**, then treatment with Penicillin. Alternative antibiotics are not acceptable in pregnancy. * **Jarisch-Herxheimer Reaction:** Be aware of this acute febrile reaction occurring within 24 hours of treatment. In pregnancy, it can trigger preterm labor or fetal distress, but it is not a contraindication to treatment. * **Screening:** All pregnant women should be screened at the first prenatal visit using non-treponemal tests (VDRL/RPR).
Question 108: At what gestational age is amniocentesis typically performed?
- A. 12-14 weeks
- B. 14-16 weeks (Correct Answer)
- C. 8-10 weeks
- D. 18-20 weeks
Explanation: **Explanation:** Amniocentesis is an invasive prenatal diagnostic procedure used to obtain amniotic fluid for genetic, chromosomal, and biochemical analysis. **Why 14–16 weeks is correct:** The ideal window for performing amniocentesis is between **15 and 18 weeks** (often cited as 14–16 weeks in standard textbooks like Williams and Dutta). At this stage, the **amnion and chorion have fused**, and there is a sufficient volume of amniotic fluid (approx. 150–200 mL) to allow for a safe tap of 15–20 mL without compromising the fetus. Performing it during this window ensures a high yield of viable fetal cells (amniocytes) for culture while minimizing procedural risks. **Analysis of Incorrect Options:** * **8–10 weeks (Option C):** This is too early for any transabdominal invasive procedure. Chorionic Villus Sampling (CVS) is typically done at 10–13 weeks. * **12–14 weeks (Option A):** Known as "Early Amniocentesis." It is generally avoided because the amnion and chorion may not have fused, increasing the risk of membrane tenting, procedure failure, fetal loss, and orthopedic deformities like clubfoot (talipes equinovarus). * **18–20 weeks (Option D):** While amniocentesis *can* be performed at this stage, it is not the "typical" or earliest recommended time. Delaying until 20 weeks leaves very little time for cell culture and legal termination of pregnancy if an abnormality is detected (legal limit in India is 24 weeks). **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication:** Fetal loss (approx. 0.1% to 0.5% in modern practice). * **Early Amniocentesis (<13 weeks):** Associated with a higher risk of **Talipes Equinovarus** and respiratory distress. * **Rh-Negative Mothers:** Must receive **Anti-D immunoglobulin** after the procedure to prevent isoimmunization. * **Alpha-fetoprotein (AFP):** Amniotic fluid AFP is measured to diagnose Open Neural Tube Defects (ONTD).
Question 109: Which investigation modality can diagnose gestational diabetes in a primigravida?
- A. HbA1C
- B. Fasting Blood Sugar (FBS)
- C. Glucose Challenge Test (GCT)
- D. Glucose Tolerance Test (GTT) (Correct Answer)
Explanation: **Explanation:** The **Oral Glucose Tolerance Test (OGTT)** is the gold standard for the **diagnosis** of Gestational Diabetes Mellitus (GDM). In pregnancy, insulin resistance increases due to placental hormones (like hPL). A diagnosis is confirmed when blood glucose levels exceed specific thresholds after a standardized glucose load (usually 75g or 100g), demonstrating the body's inability to maintain euglycemia under stress. **Analysis of Options:** * **HbA1C (Option A):** While useful for monitoring long-term control in pre-existing diabetes, it is **not** used for GDM diagnosis. It lacks sensitivity in pregnancy due to increased red cell turnover and does not reflect acute postprandial glucose spikes common in GDM. * **Fasting Blood Sugar (Option B):** FBS alone is insufficient for diagnosis. Many women with GDM have normal fasting levels but abnormal post-load levels. It is, however, a component of the OGTT. * **Glucose Challenge Test (Option C):** The GCT (50g glucose) is a **screening** tool, not a diagnostic one. A positive GCT (usually >140 mg/dL) indicates the need for a definitive GTT. **NEET-PG High-Yield Pearls:** * **DIPSI Guidelines (India):** A single-step 75g OGTT is recommended. A 2-hour plasma glucose value **≥140 mg/dL** is diagnostic of GDM, regardless of fasting status. * **Timing:** Screening is typically performed between **24–28 weeks** of gestation. * **IADPSG Criteria:** Diagnosis is made if any one value is met: Fasting ≥92 mg/dL, 1-hr ≥180 mg/dL, or 2-hr ≥153 mg/dL. * **First Visit:** High-risk patients should be screened at the first prenatal visit to rule out pre-gestational (overt) diabetes.
Question 110: Earliest diagnosis of pregnancy can be established safely by?
- A. USG for fetal cardiac activity
- B. Fetal cardiac Doppler study
- C. hCG levels (Correct Answer)
- D. MRI pelvis
Explanation: **Explanation:** The earliest biochemical marker for pregnancy is **human Chorionic Gonadotropin (hCG)**. It is produced by the syncytiotrophoblast cells following implantation. 1. **Why hCG levels are correct:** hCG can be detected in the maternal serum as early as **8–9 days after ovulation** (roughly 1 week before the missed period) using sensitive assays. In urine, it is typically detectable by the 4th week of gestation (around the time of the missed period). Since biochemical changes precede anatomical changes visible on imaging, hCG is the earliest safe method for diagnosis. 2. **Why other options are incorrect:** * **USG for fetal cardiac activity:** Transvaginal Sonography (TVS) can detect the gestational sac at 4.5–5 weeks, but fetal cardiac activity is only visible at **6–6.5 weeks**. This is significantly later than hCG detection. * **Fetal cardiac Doppler:** While Doppler can detect the fetal heart rate, it is generally used later than TVS (around 10–12 weeks via handheld Doppler) and is not the "earliest" diagnostic tool. * **MRI Pelvis:** MRI is highly accurate but is never used for the primary diagnosis of pregnancy due to high cost, lack of necessity, and the availability of simpler, faster tests. **High-Yield Clinical Pearls for NEET-PG:** * **Doubling Time:** In a healthy intrauterine pregnancy, serum β-hCG levels double every **48–72 hours** during the first trimester. * **Discriminatory Zone:** The level of hCG at which a gestational sac should be visible on TVS is **1,500–2,000 mIU/mL**. * **Peak Levels:** hCG levels reach their peak at **8–11 weeks** of gestation (approx. 100,000 mIU/mL) before declining to a plateau.
Practice by Chapter
Preconception Counseling
Practice Questions
Pregnancy Diagnosis and Dating
Practice Questions
Routine Antenatal Assessments
Practice Questions
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
Practice Questions
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