Prenatal Care Practice Questions

Q: Mrs. Y, 25 years old, with a previous history of twin pregnancy delivered at 36 weeks, is now at 10 weeks of gestation. What is her obstetric score?

G2P1L2. To determine the obstetric score, we use the **G-P-L-A** (Gravida, Para, Live, Abortus) system. The key to this question lies in understanding how multiple gestations (twins) affect these parameters. ### **Explanation of the Correct Answer (C: G2P1L2)** 1. **Gravida (G):** Refers to the total number of times a woman has been pregnant, regardless of the outcome. Mrs. Y had one previous twin pregnancy and is currently pregnant again. Thus, **G = 2**. 2. **Para (P):** Refers to the number of pregnancies that have reached the age of viability (usually 20–24 weeks). **Crucially, a multiple gestation (twins/triplets) counts as P1**, not P2, because Para counts the *event* of delivery, not the number of fetuses. Since she delivered at 36 weeks (past viability), **P = 1**. 3. **Live (L):** Refers to the number of living children. Since she delivered twins who are presumably alive, **L = 2**. ### **Why Other Options are Incorrect** * **A (G1P1L2):** Incorrect because it ignores the current pregnancy (she is currently at 10 weeks, making her G2). * **B (G1P2L2):** Incorrect because it ignores the current pregnancy and incorrectly counts twins as P2. * **D (G2P2L2):** Incorrect because it counts the previous twin delivery as two separate parity events. Parity is defined by the number of births, not the number of infants. ### **High-Yield Clinical Pearls for NEET-PG** * **The Twin Rule:** Twins count as **1 Gravida** and **1 Para**, but **2 Live** births. * **Viability:** In India, the age of viability is traditionally considered **28 weeks**, though many international guidelines (and recent Indian updates) use **24 weeks**. Any delivery after this threshold increments the "Para" count. * **Current Pregnancy:** Always remember to include the current pregnancy in the Gravida count, even if it is in the first trimester.

Q: Chorionic villus sampling is generally performed between which gestational weeks?

10 to 13 weeks. **Explanation:** **Chorionic Villus Sampling (CVS)** is a prenatal diagnostic procedure used to obtain fetal karyotype by sampling placental tissue (trophoblasts). **1. Why 10 to 13 weeks is correct:** The standard window for CVS is **10 to 13+6 weeks** of gestation. This timing is chosen because the chorion frondosum is sufficiently developed to provide an adequate sample, and it allows for early diagnosis of chromosomal abnormalities (like Down Syndrome) or genetic disorders (like Thalassemia) in the first trimester. **2. Why the other options are incorrect:** * **8 to 10 weeks:** Performing CVS before 10 weeks is contraindicated due to a significantly increased risk of **Limb Reduction Defects** (oromandibular-limb hypogenesis syndrome) and fetal loss. * **15 to 18 weeks:** This is the traditional window for **Amniocentesis**. By this stage, CVS is technically more difficult as the chorion laeve has formed, and amniocentesis becomes the safer, preferred method for obtaining fetal cells. * **20 to 24 weeks:** This period is typically reserved for Cordocentesis (Percutaneous Umbilical Blood Sampling) or detailed fetal anomaly scans. **Clinical Pearls for NEET-PG:** * **Route:** Can be performed Transabdominally (most common) or Transcervically. * **Advantage over Amniocentesis:** Provides results earlier in pregnancy, allowing for safer and more private termination if required. * **Disadvantage:** It cannot detect **Neural Tube Defects (NTDs)** because it does not measure Alpha-fetoprotein (AFP). * **Complication:** Risk of **Confined Placental Mosaicism**, where the placenta shows a different genetic makeup than the fetus, potentially leading to false positives.

Q: A pregnant woman, 7 weeks from her Last Menstrual Period (LMP), presents for her first prenatal visit. Her previous pregnancy resulted in a first-trimester missed abortion, causing significant anxiety about the current pregnancy's well-being. Which of the following modalities will best document fetal heart action?

Transvaginal sonogram. ### Explanation **1. Why Transvaginal Sonogram (TVS) is Correct:** In early pregnancy, the Transvaginal Sonogram (TVS) is the gold standard for documenting fetal viability. Fetal heart activity (cardiac flicker) can be visualized as early as **5.5 to 6 weeks** of gestation, or when the Crown-Rump Length (CRL) reaches **1–2 mm**. Given that the patient is at 7 weeks and has significant anxiety due to a previous missed abortion, TVS provides the earliest and most definitive confirmation of a live intrauterine pregnancy. **2. Analysis of Incorrect Options:** * **A & B (Regular Stethoscope and Fetoscope):** These are used for clinical auscultation much later in pregnancy. A Pinard fetoscope can typically detect fetal heart sounds (FHS) only after **18–20 weeks** of gestation. * **C (Special Fetal Doppler Equipment):** Handheld Doppler devices (ultrasound stethoscopes) are generally effective at detecting the fetal heartbeat starting from **10–12 weeks**. At 7 weeks, the embryo is too small and positioned too deep within the pelvic cavity for transabdominal Doppler to be reliable. **3. Clinical Pearls for NEET-PG:** * **Milestones on TVS:** * Gestational Sac: 4.5–5 weeks. * Yolk Sac: 5 weeks (confirms intrauterine pregnancy). * Fetal Heart Action: 5.5–6 weeks. * **Discriminatory Zone:** The level of β-hCG at which a gestational sac should be visible. For TVS, this is typically **1,500–2,000 mIU/mL**. * **Diagnosis of Missed Abortion:** On TVS, a diagnosis of pregnancy failure is made if the **CRL is ≥7 mm** with no detectable heart activity. * **Transabdominal Ultrasound (TAS):** Generally lags behind TVS by about 1 week; heart action is usually seen at 7 weeks via TAS.

Q: A G1+O patient attends the antenatal clinic at 12 weeks gestation for booking. Her blood group is B Rhesus negative. What is the next step in management?

Determine the husband's blood group. **Explanation:** The primary goal in managing a Rhesus (Rh) negative pregnant woman is to assess the risk of **Rh isoimmunization**. This occurs only if the fetus is Rh-positive, leading to potential Hemolytic Disease of the Fetus and Newborn (HDFN). **Why Option B is Correct:** The first and most non-invasive step in risk stratification is determining the **biological father’s blood group**. * If the father is **Rh-negative**, the fetus will definitely be Rh-negative (genotype dd). In this case, there is no risk of isoimmunization, and no further specialized testing or Anti-D prophylaxis is required. * If the father is **Rh-positive**, the fetus may be Rh-positive, necessitating further monitoring (Indirect Coombs Test) and Anti-D administration. **Why Other Options are Incorrect:** * **Option A:** Fetal blood group determination via amniocentesis or CVS is invasive and carries a risk of feto-maternal hemorrhage, which can actually trigger sensitization. While non-invasive prenatal testing (NIPT) for fetal RhD can be done, it is expensive and not the standard initial step before checking the father. * **Option C:** An ultrasound at 12 weeks is routine for dating and nuchal translucency but does not address the specific management of Rh-negative status. * **Option D:** An antibody titer (Indirect Coombs Test) is performed to see if the mother is *already* sensitized. However, if the father is Rh-negative, this test becomes unnecessary for the purpose of Rh management. **NEET-PG High-Yield Pearls:** * **Standard Anti-D Dose:** 300 µg (1500 IU) covers up to 30 ml of fetal whole blood or 15 ml of packed RBCs. * **Routine Prophylaxis:** Administered at **28 weeks** gestation and again within **72 hours of delivery** if the neonate is Rh-positive. * **Kleihauer-Betke Test:** Used to quantify the volume of feto-maternal hemorrhage to determine if additional doses of Anti-D are needed.

Q: Which among the following findings is the earliest to be detected by antenatal ultrasonography?

Anencephaly. **Explanation:** The correct answer is **Anencephaly (Option A)**. Anencephaly is a lethal neural tube defect characterized by the absence of the cranial vault and cerebral hemispheres. It can be diagnosed as early as **10 to 14 weeks** of gestation (late first trimester) using transvaginal or transabdominal ultrasound. The classic sonographic signs include the "Frog-eye appearance" (due to prominent orbits) and the absence of the "calvarial halo." **Analysis of Options:** * **Down’s Syndrome (Option B):** While screening via Nuchal Translucency (NT) occurs between 11–13.6 weeks, NT is a *marker*, not a definitive structural diagnosis. Definitive morphological features or associated anomalies are usually detected during the Level II scan (18–20 weeks). * **Gender Determination (Option C):** External genitalia differentiation is complete by 12 weeks, but reliable sonographic identification is typically accurate only after **14–16 weeks**. (Note: Prenatal sex determination is illegal in India under the PCPNDT Act). * **Cleft Palate (Option D):** This is a subtle facial defect. While the lip can be seen earlier, a definitive diagnosis of the palate usually requires a detailed anomaly scan in the **second trimester (18–22 weeks)**. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign of pregnancy on USG:** Gestational sac (4.5–5 weeks). * **Earliest sign of viability:** Fetal heart rate (5.5–6 weeks via TVS). * **Most accurate parameter for dating:** Crown-Rump Length (CRL) in the first trimester. * **Anencephaly:** Associated with polyhydramnios (due to failure of fetal swallowing) and elevated Maternal Serum Alpha-Fetoprotein (MSAFP).

Q: Which of the following physiological changes is NOT true in pregnancy?

Blood volume is maximum at 36 weeks gestation.. ### Explanation **1. Why Option A is the Correct Answer (The "Not True" Statement):** In pregnancy, blood volume begins to increase at 6 weeks, rises rapidly until the mid-trimester, and reaches its **peak at 30–32 weeks gestation**. After this peak, it remains relatively plateaued until term. The statement that it is maximum at 36 weeks is physiologically incorrect and a common trap in NEET-PG questions. **2. Analysis of Incorrect Options (True Statements):** * **Option B:** Cardiac output increases by 40–50%. It reaches its maximum at **30–32 weeks** (paralleling blood volume). Note: It also spikes significantly during the second stage of labor and immediately postpartum. * **Option C:** Progesterone causes smooth muscle relaxation, and the enlarging uterus causes mechanical compression. This leads to physiological hydroureter and hydronephrosis, which is most pronounced in **mid-pregnancy** (around 20–24 weeks) and is more common on the right side. * **Option D:** Pregnancy is a state of "physiological hyperlipidemia." Serum cholesterol and triglycerides rise significantly to provide nutrients for the fetus and precursors for steroid hormones, peaking around **32 weeks**. **3. High-Yield Clinical Pearls for NEET-PG:** * **Plasma vs. RBC Mass:** Plasma volume increases (50%) more than RBC mass (20–30%), leading to **physiological anemia** of pregnancy (hemodilution). * **Heart Sounds:** A loud S1 and a physiological S3 are common; however, a **diastolic murmur is always pathological**. * **Blood Pressure:** Diastolic BP decreases more than systolic BP, reaching its nadir at 24–28 weeks. * **Positioning:** Cardiac output is highest in the **left lateral position** due to the relief of aortocaval compression.

Q: Which of the following is NOT an indication for blood transfusion?

Moderate anemia at 24-30 weeks gestation. In the management of anemia during pregnancy, the decision to transfuse blood is guided by the severity of anemia, the gestational age, and the clinical status of the patient. **Why Option A is the Correct Answer:** Moderate anemia (Hemoglobin 7–10.9 g/dL) at 24–30 weeks gestation is **not** an indication for blood transfusion. At this stage of pregnancy, there is sufficient time (at least 10–16 weeks) before delivery to correct hemoglobin levels using oral or parenteral iron therapy. Blood transfusion is an invasive procedure with risks (alloimmunization, infections, reactions) and is reserved for cases where rapid correction is mandatory. **Analysis of Incorrect Options:** * **B. Severe anemia at 36 weeks gestation:** Severe anemia (Hb <7 g/dL) near term is a high-risk state. Since there is insufficient time for iron therapy to take effect before labor, transfusion is indicated to prevent heart failure and postpartum hemorrhage complications. * **C. Blood loss anemia:** Acute blood loss (e.g., APH or PPH) leading to hemodynamic instability requires immediate volume and oxygen-carrying capacity replacement via transfusion. * **D. Refractory anemia:** If anemia fails to respond to standard iron or vitamin therapy (often due to underlying bone marrow issues or chronic disease), transfusion may be necessary to maintain safe hemoglobin levels. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification:** Mild (10–10.9 g/dL), Moderate (7–9.9 g/dL), Severe ( 11 g/dL. * **Parenteral Iron:** Preferred over oral iron if the patient is non-compliant or has malabsorption, provided they are <36 weeks pregnant.

Question 1

Mrs. Y, 25 years old, with a previous history of twin pregnancy delivered at 36 weeks, is now at 10 weeks of gestation. What is her obstetric score?

Accepted Answer

G2P1L2

Answer

G1P1L2

Answer

G1P2L2

Answer

G2P2L2

Question 2

Chorionic villus sampling is generally performed between which gestational weeks?

Accepted Answer

10 to 13 weeks

Answer

8 to 10 weeks

Answer

15 to 18 weeks

Answer

20 to 24 weeks

Question 3

A 19-year-old G2P1 woman at 9 weeks' gestation presents for her second prenatal visit. She reports occasional nausea, with no other complaints. Her first child was delivered vaginally without complications. She is not taking any medications and denies ethanol, tobacco, or current drug use. She has a history of intravenous drug abuse but denies using them since the birth of her first child. She has had multiple sexual partners and does not use contraception. On physical examination, her lungs are clear and her heart has a regular rate and rhythm without murmurs, rubs, or gallops. The physician informs her that routine prenatal tests, including an HIV test, will be performed and discusses the risks and benefits. What else should the physician inform the patient before performing the HIV test?

Accepted Answer

Despite the potential for fetal infection, she may opt out of the test.

Answer

Early retroviral therapy will absolutely decrease the chances of transmitting the infection to the baby.

Answer

The CDC recommends screening only for patients with high-risk factors.

Answer

The risk of the test includes potential for fetal loss.

Question 4

Antenatal maternal HIV diagnosis is important for what reason?

Accepted Answer

Preventing vertical transmission

Answer

Indicating termination of pregnancy

Answer

Guiding patient discharge

Answer

Determining the need for patient isolation

Question 5

A pregnant woman, 7 weeks from her Last Menstrual Period (LMP), presents for her first prenatal visit. Her previous pregnancy resulted in a first-trimester missed abortion, causing significant anxiety about the current pregnancy's well-being. Which of the following modalities will best document fetal heart action?

Accepted Answer

Transvaginal sonogram

Answer

Regular stethoscope

Answer

Fetoscope

Answer

Special fetal Doppler equipment

Question 6

Which of the following statements regarding the expected date of delivery (EDD) is not true?

Accepted Answer

The standard deviation around the expected date of delivery is 3 weeks.

Answer

Less than 5% of deliveries occur on the exact expected date of delivery.

Answer

Approximately 50% of deliveries occur within one week of the expected date of delivery.

Answer

Approximately 80% of deliveries occur within two weeks of the expected date of delivery.

Question 7

A G1+O patient attends the antenatal clinic at 12 weeks gestation for booking. Her blood group is B Rhesus negative. What is the next step in management?

Accepted Answer

Determine the husband's blood group

Answer

Determine the fetal blood group

Answer

Perform an ultrasound scan

Answer

Perform Rhesus antibody titer

Question 8

Which among the following findings is the earliest to be detected by antenatal ultrasonography?

Accepted Answer

Anencephaly

Answer

Down's syndrome

Answer

Gender determination

Answer

Cleft palate

Question 9

Which of the following physiological changes is NOT true in pregnancy?

Accepted Answer

Blood volume is maximum at 36 weeks gestation.

Answer

Cardiac output is maximum at 30 weeks gestation.

Answer

Ureters dilate maximally in mid-pregnancy.

Answer

Serum cholesterol levels are maximum at 32 weeks gestation.

Question 10

Which of the following is NOT an indication for blood transfusion?

Accepted Answer

Moderate anemia at 24-30 weeks gestation

Answer

Severe anemia at 36 weeks gestation

Answer

Blood loss anemia

Answer

Refractory anemia

Prenatal Care — MCQs

Prenatal Care — MCQs

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