Prenatal Care — MCQs

Prenatal Care Indian Medical PG Practice Questions and MCQs

Question 321: Folic acid supplementation reduces the risk of:

A. Neural tube defect (Correct Answer)
B. Toxaemia of pregnancy
C. Down's syndrome
D. Placenta previa

Explanation: **Explanation:** **Neural Tube Defects (NTDs)** occur due to the failure of the neural tube to close spontaneously between the 3rd and 4th week after conception (21st to 28th day post-fertilization). Folic acid is a crucial co-enzyme in DNA synthesis and methylation. Its deficiency leads to impaired cell proliferation in the developing neural folds. Supplementation ensures adequate folate levels during this critical window, significantly reducing the incidence of defects like Anencephaly and Spina Bifida. **Analysis of Incorrect Options:** * **Toxaemia of pregnancy (Pre-eclampsia):** While some studies suggest folic acid might have a minor role in homocysteine metabolism related to vascular health, it is not the primary preventive measure. Low-dose Aspirin and Calcium are the established prophylactic agents for high-risk cases. * **Down’s syndrome:** This is a chromosomal anomaly (Trisomy 21) caused by non-disjunction during meiosis. It is related to maternal age, not nutritional deficiencies. * **Placenta previa:** This is an anatomical condition where the placenta implants in the lower uterine segment. Risk factors include previous C-sections, multiparity, and smoking, but not folic acid deficiency. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Timing:** Supplementation must start **pre-conceptionally** (at least 1 month before pregnancy) and continue until 12 weeks of gestation. * **Standard Dose:** 400 mcg (0.4 mg) daily for low-risk women. * **High-Risk Dose:** 4 mg (4000 mcg) daily for women with a previous history of an NTD-affected pregnancy, those on anti-epileptic drugs (Valproate), or those with diabetes. * **Screening:** Maternal Serum Alpha-Fetoprotein (MSAFP) is the screening marker for open NTDs, typically measured between 15-20 weeks.

Question 322: A 26-year-old G1P0 in her 16th week of gestation had a quad screen that suggested a 1:50 risk for Down syndrome. An ultrasound places the fetus at 15 weeks and 5 days gestation. What is the recommended next step in counseling?

A. The quad screen was drawn too early.
B. The patient should undergo amniocentesis now. (Correct Answer)
C. It is safe to wait until 22 weeks for amniocentesis.
D. The patient should consider termination as an option due to the abnormal quad screen.

Explanation: ### Explanation **1. Why Option B is Correct:** The **Quadruple Screen** (AFP, hCG, uE3, and Inhibin-A) is ideally performed between **15 and 20 weeks** of gestation (optimal window: 16–18 weeks). In this case, the patient is at 16 weeks (confirmed by ultrasound as 15 weeks 5 days), meaning the test was performed at the correct time and the results are valid. A risk of 1:50 is considered "screen positive" (usually >1:250). Since she is already in the second trimester, **amniocentesis** is the definitive diagnostic test of choice. It is typically performed between **15 and 20 weeks** to obtain fetal karyotype or chromosomal microarray. **2. Why Other Options are Incorrect:** * **Option A:** The quad screen is valid from 15 to 22 weeks. Drawing it at 16 weeks is within the optimal window. * **Option C:** While amniocentesis can be done after 20 weeks, waiting until 22 weeks unnecessarily delays diagnosis. In many jurisdictions, legal limits for termination of pregnancy (if the patient chooses) occur around 20–24 weeks; thus, prompt diagnosis is essential for informed decision-making. * **Option D:** A quad screen is a **screening test**, not a diagnostic one. It indicates a higher probability but does not confirm the condition. Termination should never be offered based solely on a screening result without diagnostic confirmation (amniocentesis or CVS). **3. NEET-PG High-Yield Pearls:** * **Quad Screen Markers in Down Syndrome (Trisomy 21):** "HI" is high (**H**CG and **I**nhibin-A are elevated), while AFP and uE3 are low. * **Amniocentesis vs. CVS:** CVS is done at 10–13 weeks (1st trimester); Amniocentesis is done at 15–20 weeks (2nd trimester). * **Most common cause of an abnormal quad screen:** Inaccurate gestational age (dating error). Always correlate with ultrasound. * **Risk of pregnancy loss:** Amniocentesis carries a procedure-related pregnancy loss risk of approximately 0.1% to 0.3% (1 in 300 to 1 in 1000).

Question 323: What is the definition of prolonged pregnancy?

A. Completed 38 weeks
B. Completed 40 weeks
C. Completed 41 weeks
D. Completed 42 weeks (Correct Answer)

Explanation: **Explanation:** The definition of **prolonged pregnancy** (also known as post-term pregnancy) is based on the duration of gestation calculated from the first day of the last menstrual period (LMP). According to FIGO and ACOG, a pregnancy is defined as prolonged when it exceeds **42 completed weeks** (294 days or more) from the LMP. **Analysis of Options:** * **Option D (Correct):** A pregnancy is "post-term" only after the completion of 42 weeks. This is the critical threshold because perinatal morbidity and mortality (due to placental insufficiency and meconium aspiration) increase significantly beyond this point. * **Option A & B (Incorrect):** 37 to 40 weeks is considered **Full Term**. Specifically, 39 weeks 0 days to 40 weeks 6 days is "Full Term," while 37 weeks to 38 weeks 6 days is "Early Term." * **Option C (Incorrect):** 41 weeks 0 days to 41 weeks 6 days is defined as **Late-Term**. While induction is often considered during this window, it does not yet meet the definition of "prolonged" or "post-term." **High-Yield Clinical Pearls for NEET-PG:** 1. **Most common cause:** The most frequent cause of a "prolonged" pregnancy is **wrong dates** (inaccurate LMP). 2. **Biological causes:** Rare associations include **fetal anencephaly** (lack of ACTH), **placental sulfatase deficiency**, and extrauterine pregnancy. 3. **Placental Changes:** Look for "Post-maturity syndrome" (Clifford’s syndrome) in the neonate, characterized by loss of subcutaneous fat, wrinkled skin, and long nails. 4. **Management:** Induction of labor is generally recommended between 41 and 42 weeks to prevent stillbirth.

Question 324: A woman has experienced three consecutive second-trimester abortions. She is now presenting for a prenatal checkup. What is the most appropriate investigation among the following?

A. Hysteroscopy
B. Hysterosalpingography (Correct Answer)
C. Chromosomal analysis
D. Prenatal cerclage

Explanation: ### Explanation The clinical presentation of three consecutive second-trimester abortions points toward **Recurrent Pregnancy Loss (RPL)**. In the second trimester, the most common anatomical causes are **Cervical Insufficiency** and **Uterine Anomalies** (such as a septate or bicornuate uterus). **1. Why Hysterosalpingography (HSG) is the correct answer:** HSG is the gold-standard initial screening tool to evaluate the uterine cavity and cervical canal in cases of recurrent mid-trimester losses. It helps identify: * **Uterine Malformations:** Congenital anomalies that reduce the space for a growing fetus. * **Cervical Competence:** An internal os diameter >6 mm on HSG (or a "funneling" appearance) is highly suggestive of cervical incompetence. * **Intrauterine Synechiae:** Asherman’s syndrome, which can interfere with placentation. **2. Why other options are incorrect:** * **Hysteroscopy (A):** While it provides direct visualization of the cavity, it is an invasive procedure usually reserved for *treating* identified defects (like resection of a septum) rather than primary screening. * **Chromosomal Analysis (C):** This is the investigation of choice for **first-trimester** recurrent abortions, where genetic abnormalities (balanced translocations) are the leading cause. It is less likely to be the primary cause of mid-trimester losses. * **Prenatal Cerclage (D):** This is a *treatment* modality, not an investigation. It is performed based on history or ultrasound findings of a short cervix, but only after a diagnosis is established. **Clinical Pearls for NEET-PG:** * **Definition of RPL:** 2 or more consecutive pregnancy losses (ACOG/ESHRE). * **Most common cause of 1st-trimester RPL:** Genetic/Chromosomal factors. * **Most common cause of 2nd-trimester RPL:** Anatomical factors (Cervical incompetence/Uterine anomalies). * **Investigation of choice for Cervical Incompetence:** Transvaginal Ultrasound (TVUS) during pregnancy (to measure cervical length) or HSG/Lash test in the non-pregnant state.

Question 325: A 32-week pregnant primigravida presents with dyspnea. Her hemoglobin is 10 mg%. What is the minimum hemoglobin level in pregnancy below which anemia can be diagnosed?

A. 9 mg%
B. 10 mg%
C. 11 mg% (Correct Answer)
D. 12 mg%

Explanation: ### Explanation **1. Understanding the Correct Answer (C: 11 mg%)** In pregnancy, there is a physiological increase in both plasma volume (approx. 50%) and red cell mass (approx. 20-30%). Because the plasma volume expansion exceeds the increase in red cell mass, a state of **hemodilution** occurs, often referred to as "physiological anemia of pregnancy." According to the **World Health Organization (WHO)** and the **CDC**, anemia in pregnancy is defined as a Hemoglobin (Hb) level **< 11 g/dL** (or 11 mg% as per the question's units). This threshold is lower than the non-pregnant female cutoff (12 g/dL) to account for this normal physiological expansion. **2. Analysis of Incorrect Options** * **A (9 mg%):** This represents moderate anemia. While common in clinical practice, it is well below the diagnostic threshold. * **B (10 mg%):** This is the threshold used by the **ICMR (Indian Council of Medical Research)** to define anemia in the Indian context for public health purposes, but the standard WHO diagnostic criteria used in exams remains 11 g/dL. * **D (12 mg%):** This is the cutoff for anemia in **non-pregnant** adult females. **3. NEET-PG High-Yield Pearls** * **WHO Classification of Anemia in Pregnancy:** * **Mild:** 10 – 10.9 g/dL * **Moderate:** 7 – 9.9 g/dL * **Severe:** < 7 g/dL * **Very Severe:** < 4 g/dL (Medical emergency) * **Timing:** Hemodilution is maximum at **30–32 weeks** of gestation, which is why patients often present with symptoms like dyspnea during this period. * **Prophylaxis:** Under the *Anemia Mukt Bharat* guidelines, pregnant women should receive **60 mg elemental iron and 500 µg folic acid** daily for 180 days, starting from the second trimester.

Question 326: What is the first symptom of pregnancy?

A. Tingling in the breasts
B. Amenorrhea (Correct Answer)
C. Morning sickness
D. Quickening

Explanation: **Explanation:** **Amenorrhea** (cessation of menses) is considered the **first and most common symptom** of pregnancy in a woman of reproductive age with previously regular cycles. This occurs because the corpus luteum continues to produce progesterone following fertilization, preventing the shedding of the endometrial lining. While it is a highly sensitive indicator, it is not diagnostic, as it can be caused by stress, endocrinopathies, or systemic illness. **Analysis of Incorrect Options:** * **Tingling in the breasts:** Breast changes (heaviness, tingling, and tenderness) are early signs caused by rising estrogen and progesterone levels, typically appearing around **4–6 weeks** of gestation, usually after the missed period. * **Morning sickness:** Nausea and vomiting generally start around the **6th week** of gestation and peak by the 9th week. It is mediated by the rapid rise in Human Chorionic Gonadotropin (hCG) levels. * **Quickening:** This refers to the first perception of fetal movements by the mother. It occurs much later—around **18–20 weeks** in primigravida and **16–18 weeks** in multigravida. **Clinical Pearls for NEET-PG:** * **Presumptive signs:** Subjective symptoms like amenorrhea, fatigue, and breast changes. * **Probable signs:** Objective findings like **Hegar’s sign** (softening of the isthmus) and **Chadwick’s sign** (bluish discoloration of the cervix/vagina). * **Positive signs:** Diagnostic findings like fetal heart sounds (Doppler at 10–12 weeks) and visualization of the fetus on USG (Gestational sac at 4.5–5 weeks). * **Rule of thumb:** In any woman of reproductive age presenting with sudden onset amenorrhea, pregnancy must be ruled out first.

Question 327: Karyotyping of the fetus can be performed using all of the following invasive methods except?

A. Amniocentesis
B. Cordocentesis
C. Chorionic villi sampling
D. Fetal skin biopsy (Correct Answer)

Explanation: **Explanation:** The core objective of fetal karyotyping is to obtain rapidly dividing fetal cells to visualize chromosomes. While several invasive procedures can provide these cells, they are categorized by their primary clinical utility and safety profile. **1. Why Fetal Skin Biopsy is the Correct Answer:** While a fetal skin biopsy does contain fetal cells, it is **not** a standard or routine method for karyotyping. It is a highly specialized, invasive procedure reserved for diagnosing rare, severe **genodermatoses** (e.g., Ichthyosis or Epidermolysis bullosa) when DNA-based diagnosis is unavailable. Due to the high risk of fetal injury and the availability of simpler methods for chromosomal analysis, it is never used for routine karyotyping. **2. Analysis of Incorrect Options:** * **Amniocentesis:** The "gold standard" for prenatal diagnosis. It involves aspirating amniotic fluid containing desquamated fetal cells (amniocytes) which are cultured for karyotyping. Usually performed at **15–20 weeks**. * **Chorionic Villi Sampling (CVS):** Involves aspirating trophoblastic tissue. It is the preferred method for **early diagnosis** (performed at **10–13 weeks**) and provides rapid results via direct preparation or culture. * **Cordocentesis (Percutaneous Umbilical Blood Sampling):** Involves sampling fetal blood from the umbilical vein. It provides the **fastest karyotype** (within 48–72 hours) because fetal lymphocytes are easily cultured. It is typically done after **18 weeks**. **Clinical Pearls for NEET-PG:** * **Earliest Method:** CVS (10–13 weeks). * **Most Common Method:** Amniocentesis. * **Fastest Karyotype:** Cordocentesis (due to T-lymphocytes). * **Risk of Procedure-related Loss:** CVS (~0.5–1%) > Amniocentesis (~0.1–0.5%). * **Non-Invasive Alternative:** Cell-free DNA (cfDNA) screening (NIPT), though it is a screening tool, not a definitive karyotype.

Question 328: Jacquemier's sign in early pregnancy is:

A. Softening of the cervix
B. Bluish discoloration of the anterior vaginal wall (Correct Answer)
C. Mucous discharge
D. Increased pulsations

Explanation: **Explanation:** **Jacquemier’s sign** (also known as **Chadwick’s sign**) is a presumptive sign of pregnancy characterized by a dusky, bluish, or purplish discoloration of the anterior vaginal wall and the vestibule. This occurs due to **increased vascularity and venous congestion** in the pelvic organs, triggered by rising estrogen levels starting around the 6th to 8th week of gestation. **Analysis of Options:** * **Option B (Correct):** This is the classic definition of Jacquemier’s sign. The congestion of the pelvic vasculature leads to the characteristic blue hue. * **Option A (Incorrect):** Softening of the cervix is known as **Goodell’s sign**. It typically becomes palpable around the 6th week. * **Option C (Incorrect):** While vaginal discharge (leukorrhea) increases during pregnancy due to hormonal changes, it is not a named clinical sign like Jacquemier’s. * **Option D (Incorrect):** Increased pulsations felt through the lateral vaginal fornices due to increased vascularity is known as **Osiander’s sign**. **High-Yield Clinical Pearls for NEET-PG:** * **Hegar’s Sign:** Softening of the lower uterine segment (isthmus), detectable via bimanual examination between 6–10 weeks. * **Palmer’s Sign:** Regular, rhythmic uterine contractions felt during early pregnancy. * **Piscacek’s Sign:** Asymmetrical enlargement of the uterus if implantation occurs near one of the cornua. * **Timeline:** Most of these clinical signs (Jacquemier’s, Goodell’s, Hegar’s) appear between the **6th and 8th week** of pregnancy.

Question 329: A G1P0 woman at 28 weeks of gestation has a urine dipstick test showing mild glycosuria. What is the next step in management?

A. No intervention is required.
B. Perform a glucose challenge test. (Correct Answer)
C. Perform a glucose tolerance test.
D. Start antidiabetic medication.

Explanation: **Explanation:** **1. Why Option B is Correct:** During pregnancy, the **Renal Threshold for Glucose** decreases due to an increase in the Glomerular Filtration Rate (GFR) and reduced tubular reabsorption. While mild glycosuria can be a physiological finding in pregnancy, it is also a sensitive clinical marker for undiagnosed **Gestational Diabetes Mellitus (GDM)**. According to standard protocols, any instance of glycosuria (especially if detected for the first time or persistent) warrants a formal screening. The **Glucose Challenge Test (GCT)**, involving a 50g oral glucose load followed by a 1-hour plasma glucose measurement, is the standard screening tool used to identify women who require further diagnostic testing. **2. Why Other Options are Incorrect:** * **Option A:** Ignoring glycosuria is risky, as missing a GDM diagnosis can lead to maternal and fetal complications (e.g., macrosomia, polyhydramnios). * **Option C:** The Glucose Tolerance Test (GTT) is a **diagnostic** test (usually 75g or 100g). It is typically performed only if the initial screening (GCT) returns an abnormal result. * **Option D:** Pharmacotherapy (Insulin or Metformin) is never started based on a urine dipstick; it requires a confirmed diagnosis via GTT and a failure of Medical Nutrition Therapy (MNT). **Clinical Pearls for NEET-PG:** * **DIPSI Guidelines:** In India, the DIPSI (Diabetes in Pregnancy Study Group India) recommends a single-step 75g GTT, where a 2-hour value $\geq$ 140 mg/dL is diagnostic. * **Screening Timing:** Routine screening for GDM is performed between **24–28 weeks** of gestation. * **Renal Threshold:** In non-pregnant adults, it is ~180 mg/dL; in pregnancy, it drops significantly, making glycosuria common but necessitating caution.

Question 330: Hegar sign can be elicited in which of the following periods?

A. Early pregnancy (Correct Answer)
B. Late pregnancy
C. During labor
D. During puerperium

Explanation: **Explanation:** **Hegar’s sign** is a classic clinical sign of pregnancy characterized by the **softening of the lower uterine segment (isthmus)**. This occurs because the upper part of the uterus (the body) is enlarged by the growing fetus, while the cervix remains relatively firm. The intervening isthmus becomes soft and compressible, allowing the examining fingers of a bimanual examination to almost meet. 1. **Why "Early Pregnancy" is correct:** Hegar’s sign typically becomes detectable between **6 to 10 weeks** of gestation. It is one of the "probable" signs of pregnancy. By this stage, hormonal changes (estrogen and progesterone) increase vascularity and pelvic congestion, leading to the characteristic softening. 2. **Why other options are incorrect:** * **Late pregnancy:** As the pregnancy progresses into the second and third trimesters, the entire uterus expands and the lower segment is incorporated into the uterine cavity (thinning out), making this specific sign impossible to elicit. * **During labor:** The focus shifts to cervical effacement and dilation; the anatomical distinction required for Hegar’s sign is lost. * **During puerperium:** After delivery, the uterus undergoes involution and becomes firm again as it returns to its non-pregnant state. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Most prominent at **6–10 weeks**. * **Other Early Pregnancy Signs:** * **Goodell’s Sign:** Softening of the cervix (feels like the lips instead of the tip of the nose). * **Chadwick’s Sign:** Bluish discoloration of the cervix/vagina due to increased vascularity. * **Piskacek’s Sign:** Asymmetrical enlargement of the uterus if implantation occurs near a uterine horn. * **Palmer’s Sign:** Rhythmic uterine contractions felt during a bimanual exam (detectable at 4–8 weeks).

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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