Prenatal Care — MCQs

A 37-year-old primigravida, Rh-negative patient at 16 weeks gestation is concerned about her pregnancy due to her age. She is HIV negative, hepatitis B surface antigen negative, Rubella nonimmune, and asymptomatic. Her triple test results are normal. Despite this, she insists on undergoing amniocentesis due to her age. What is the next best step in management?

Q358Easy

The first trimester of pregnancy completes by which gestational week?

Q359Easy

Palmer's sign elicits:

Q360Medium

A 30-year-old G1P0 woman complains of nausea and vomiting for the first 3 months of her pregnancy. She is noted to have a hemoglobin level of 9.0 g/dl and a mean corpuscular volume of 110 fL (normal 90-105 fL). Which of the following is the most likely etiology of the anemia?

Prenatal Care Indian Medical PG Practice Questions and MCQs

Question 351: What are the extra calories required during pregnancy?

A. 100 kcal/day
B. 200 kcal/day
C. 300 kcal/day (Correct Answer)
D. 400 kcal/day

Explanation: **Explanation:** The correct answer is **300 kcal/day**. This value represents the average daily additional energy requirement needed to support the physiological changes of pregnancy, including the growth of the fetus, placenta, and maternal tissues (uterus, breasts, and expanded blood volume). **Why 300 kcal/day is correct:** According to the ICMR (Indian Council of Medical Research) and WHO guidelines, a pregnant woman requires an additional **350 kcal/day** during the second and third trimesters. However, in the context of standard medical examinations like NEET-PG, the traditional value of **300 kcal/day** is frequently cited as the average requirement across the entire gestational period. This energy is essential to prevent maternal protein catabolism and ensure optimal fetal birth weight. **Why other options are incorrect:** * **100 kcal/day & 200 kcal/day:** These values are insufficient to meet the metabolic demands of the second and third trimesters. While energy needs in the first trimester are negligible (approx. 0–85 kcal/day), these options would lead to inadequate weight gain. * **400 kcal/day:** This exceeds the standard recommendation for a singleton pregnancy. However, it is important to note that for **lactation** (0–6 months), the requirement increases significantly to approximately **+500 to 600 kcal/day**. **High-Yield Clinical Pearls for NEET-PG:** * **Total Weight Gain:** For a woman with a normal BMI, the recommended weight gain is **11–16 kg**. * **Protein Requirement:** An additional **23g/day** (ICMR) is recommended during pregnancy. * **Iron & Folic Acid:** 60 mg of elemental iron and 400 µg (0.4 mg) of folic acid are standard prophylactic doses. * **Twin Pregnancy:** The caloric requirement increases to approximately **+600 kcal/day**.

Question 352: At what gestational age is the yolk sac earliest seen?

A. 5.5 weeks (Correct Answer)
B. 7.5 weeks
C. 10 weeks
D. 12.5 weeks

Explanation: **Explanation:** The appearance of gestational structures on ultrasound follows a predictable chronological sequence, which is a high-yield topic for NEET-PG. 1. **Why 5.5 weeks is correct:** The **yolk sac** is the first structure to appear within the gestational sac and is the definitive sonographic sign of an intrauterine pregnancy. Using a Transvaginal Scan (TVS), the yolk sac typically becomes visible at **5.5 weeks** of gestation (when the Mean Sac Diameter is approximately 8 mm). It plays a crucial role in nutrient transfer and hematopoiesis before the placenta is fully functional. 2. **Why the other options are incorrect:** * **7.5 weeks:** By this stage, the embryo is clearly visible with distinct cardiac activity (which starts at ~6 weeks). The yolk sac is already well-established. * **10 weeks:** At this point, the yolk sac begins to degenerate as the placenta takes over nutritional functions. It typically disappears by the end of the first trimester (12 weeks). * **12.5 weeks:** The yolk sac is usually no longer visible on ultrasound by this time, as it has been incorporated into the gut tube or has regressed. **Clinical Pearls for NEET-PG:** * **Order of appearance (TVS):** Gestational Sac (4.5–5 weeks) → Yolk Sac (5.5 weeks) → Fetal Pole/Embryo with Heartbeat (6 weeks). * **Rule of 10s (Abdominal Scan):** Structures are generally seen 1 week later on Transabdominal Scan (TAS) compared to TVS. * **Discriminatory Zone:** If the β-hCG is >1500–2000 mIU/ml (TVS), a gestational sac should be visible. * **Abnormal Yolk Sac:** A yolk sac diameter **>6 mm** or a calcified yolk sac is often associated with an abnormal pregnancy outcome or fetal demise.

Question 353: Which of the following is NOT a criterion for fetal growth assessment?

A. Height of the uterus
B. Maternal weight gain (Correct Answer)
C. Ultrasonographic measurement of biparietal diameter
D. Ultrasonographic measurement of fetal abdominal circumference

Explanation: **Explanation:** The assessment of fetal growth relies on parameters that directly measure the fetus or the uterine size reflecting fetal volume. **Maternal weight gain** is not a reliable criterion for fetal growth because it is influenced by numerous extrinsic and maternal factors, including maternal obesity, edema (preeclampsia), polyhydramnios, and nutritional status. While poor weight gain may raise suspicion, it lacks the specificity and sensitivity required to diagnose fetal growth restriction (FGR). **Analysis of Options:** * **Height of the Uterus (Symphysio-fundal height):** This is the primary clinical screening tool. After 24 weeks, the SFH in centimeters typically corresponds to the gestational age in weeks. A discrepancy of >3 cm suggests growth abnormalities or fluid volume issues. * **Biparietal Diameter (BPD):** An essential USG biometric parameter. While more accurate for dating in the second trimester, it helps assess head growth and is used to calculate the Estimated Fetal Weight (EFW). * **Abdominal Circumference (AC):** This is the **most sensitive** single biometric parameter for assessing fetal growth and nutrition. Since the liver is the first organ to show effects of malnutrition (depletion of glycogen stores), AC is the first parameter to lag in asymmetric FGR. **High-Yield Clinical Pearls for NEET-PG:** * **Best USG parameter for dating (1st Trimester):** Crown-Rump Length (CRL). * **Best USG parameter for fetal growth (3rd Trimester):** Abdominal Circumference (AC). * **Ponderal Index:** Used to differentiate between symmetric and asymmetric FGR. * **Head Circumference/Abdominal Circumference (HC/AC) Ratio:** Increased in asymmetric FGR (brain-sparing effect).

Question 354: In the general population, what is the primary method for antenatal screening of Down syndrome?

A. Ultrasound (USG)
B. Serum biomarkers (Correct Answer)
C. Chorionic villus sampling
D. Amniocentesis

Explanation: **Explanation:** The primary method for antenatal screening of Down syndrome (Trisomy 21) in the general population is **Serum Biomarkers**. Screening is designed to be non-invasive and cost-effective for all pregnant women to identify those at high risk who require further diagnostic testing. * **First Trimester Screening (11–13.6 weeks):** Combined test using **PAPP-A** (decreased) and **free β-hCG** (increased), often alongside USG for Nuchal Translucency (NT). * **Second Trimester Screening (15–20 weeks):** **Quadruple marker test**, which measures AFP (decreased), uE3 (decreased), hCG (increased), and Inhibin-A (increased). **Why other options are incorrect:** * **Ultrasound (USG):** While USG measures Nuchal Translucency (NT), it is most effective when *combined* with serum markers. On its own, it has a lower detection rate than combined screening. * **Chorionic Villus Sampling (CVS) & Amniocentesis:** These are **diagnostic** (confirmatory) tests, not screening tests. They are invasive, carry a risk of miscarriage (~0.5%), and are reserved for women who screen positive or have high-risk factors. **High-Yield NEET-PG Pearls:** * **Best Screening Tool:** Combined test (NT + PAPP-A + hCG) in the 1st trimester is superior to the 2nd-trimester Quadruple test. * **Most Sensitive Screen:** Cell-free DNA (cfDNA/NIPT) is the most sensitive screening method (>99%), but serum biomarkers remain the standard primary screen in many protocols due to cost. * **Inhibin-A:** This is the most sensitive component of the Quadruple marker test for Down syndrome. * **Rule of Thumb:** In Down syndrome, "Highs are **H**igh" (**H**CG and **I**nhibin-A) and the rest are low.

Question 355: What is quickening?

A. Heartbeat
B. Uterine contractions
C. Feeling of first fetal movement by mother (Correct Answer)
D. None of the above

Explanation: **Explanation:** **Quickening** refers to the first perception of fetal movements by the pregnant woman. It is a subjective clinical milestone that provides a rough estimation of gestational age and serves as a reassuring sign of fetal life. * **Why Option C is Correct:** Quickening occurs when the fetus grows large enough and its muscular movements become strong enough to be felt through the uterine wall. In **primigravida** (first-time mothers), it is typically felt between **18–20 weeks**, whereas in **multigravida** (women who have been pregnant before), it is felt earlier, around **16–18 weeks**, due to prior experience and abdominal wall laxity. * **Why Other Options are Incorrect:** * **Option A (Heartbeat):** Fetal heart sounds are detected via Doppler (10–12 weeks) or Pinard stethoscope (18–20 weeks), but this is not termed quickening. * **Option B (Uterine contractions):** Early painless contractions are known as **Braxton-Hicks contractions**, which are distinct from fetal movements. **High-Yield Clinical Pearls for NEET-PG:** 1. **Timing:** 18 weeks (Primi) vs. 16 weeks (Multi). This 2-week difference is a frequent exam favorite. 2. **Clinical Significance:** It helps in confirming the Expected Date of Delivery (EDD) if the Last Menstrual Period (LMP) is unreliable. 3. **Fetal Kick Count:** Later in pregnancy, monitoring movements (e.g., Cardiff "Count to Ten" chart) is a screening tool for fetal well-being; a decrease may indicate fetal distress or placental insufficiency.

Question 356: A female has a history of 6 weeks amenorrhea. Ultrasound shows an empty sac and serum p-hCG is 6500 IU/L. What would be the next management step?

A. Medical management (Correct Answer)
B. Repeat hCG after 48 hours
C. Repeat hCG after 1 week
D. Surgical management

Explanation: This question tests the concept of the **Discriminatory Zone** in early pregnancy management. ### **Explanation of the Correct Answer** The **Discriminatory Zone** is the level of serum β-hCG above which an intrauterine gestational sac should be visible on ultrasound. For Transvaginal Sonography (TVS), this threshold is typically **1,500–2,000 IU/L**. In this patient, the β-hCG is **6,500 IU/L**, which is significantly above the discriminatory zone. The presence of an **empty sac** (gestational sac without a yolk sac or embryo) at this hCG level, combined with 6 weeks of amenorrhea, confirms a **failed early pregnancy** (Anembryonic pregnancy/Blighted ovum). Once a non-viable pregnancy is diagnosed, the next step is termination. **Medical management** (using Misoprostol with or without Mifepristone) is the preferred first-line approach for a stable patient. ### **Why Other Options are Incorrect** * **B & C (Repeat hCG):** Serial β-hCG monitoring is indicated in "Pregnancy of Unknown Location" (PUL), where the hCG is *below* the discriminatory zone and no sac is seen. Here, the level is high and a sac is visible, making the diagnosis of failure certain. Delaying treatment increases the risk of hemorrhage. * **D (Surgical management):** While an option for failed pregnancies (D&C or MVA), medical management is generally preferred as the initial step unless the patient is hemodynamically unstable or has contraindications to drugs. ### **High-Yield Clinical Pearls for NEET-PG** * **Discriminatory Zone (TVS):** 1,500–2,000 IU/L. * **Discriminatory Zone (TAS):** 6,000–6,500 IU/L. * **Diagnosis of Blighted Ovum (SRU Criteria):** Mean Sac Diameter (MSD) of **≥25 mm** with no embryo on TVS. * **Normal hCG Doubling Time:** In a viable pregnancy, β-hCG levels should increase by at least 35–53% every 48 hours. * **Yolk Sac Appearance:** Should be seen via TVS when MSD is **8 mm**.

Question 357: A 37-year-old primigravida, Rh-negative patient at 16 weeks gestation is concerned about her pregnancy due to her age. She is HIV negative, hepatitis B surface antigen negative, Rubella nonimmune, and asymptomatic. Her triple test results are normal. Despite this, she insists on undergoing amniocentesis due to her age. What is the next best step in management?

A. Advise against amniocentesis as it could increase the risk of isoimmunization. (Correct Answer)
B. Carefully follow Rh antibody titers and administer Anti-D immunoglobulin if evidence of isoimmunization is present.
C. Administer Anti-D immunoglobulin at 28 weeks of gestation and after delivery if the baby is Rh-negative.
D. Administer Anti-D immunoglobulin prior to her amniocentesis.

Explanation: ### Explanation **1. Why Option A is Correct:** The core clinical dilemma here is balancing the patient’s anxiety regarding advanced maternal age (AMA) against the risks of an invasive procedure in an **Rh-negative** individual. Amniocentesis carries a significant risk of **feto-maternal hemorrhage (FMH)**. When fetal red blood cells enter the maternal circulation during the procedure, they can trigger maternal sensitization (isoimmunization) if the fetus is Rh-positive. Since her **Triple Test results are normal**, the clinical indication for amniocentesis is weak. In a primigravida with a low-risk screening result, the risk of inducing Rh isoimmunization often outweighs the diagnostic benefit of the procedure. Therefore, the physician should first counsel the patient against the procedure. **2. Why Other Options are Incorrect:** * **Option B:** Following titers is a reactive approach. The goal of management is **primary prevention** of sensitization. Once titers are positive, isoimmunization has already occurred, which can lead to Hemolytic Disease of the Fetus and Newborn (HDFN) in future pregnancies. * **Option C:** This describes the standard prophylactic protocol (28 weeks and postpartum). However, it ignores the immediate risk posed by the invasive procedure at 16 weeks. * **Option D:** While Anti-D is indeed administered during invasive procedures to prevent sensitization, the *first* step in management for a patient with a normal screening test is to counsel against unnecessary risks. If the patient still insists after counseling, then Anti-D would be mandatory. **3. Clinical Pearls for NEET-PG:** * **Standard Dose:** 300 mcg of Anti-D immunoglobulin is given for any invasive procedure (amniocentesis/CVS) performed after 12 weeks of gestation. * **Indications for Amniocentesis:** Usually performed between 15–20 weeks for chromosomal analysis, DNA studies, or fetal lung maturity. * **Rh-Negative Management:** Always check the Indirect Coombs Test (ICT) first. Anti-D is only effective if the mother is not already sensitized (ICT negative). * **Kleihauer-Betke Test:** Used to quantify the amount of FMH to determine if additional doses of Anti-D are required beyond the standard 300 mcg.

Question 358: The first trimester of pregnancy completes by which gestational week?

A. 10 weeks
B. 12 weeks
C. 13 weeks
D. 14 weeks (Correct Answer)

Explanation: **Explanation:** In modern obstetric practice, the division of pregnancy into trimesters is based on the total duration of a full-term pregnancy (40 weeks). According to the **ACOG (American College of Obstetricians and Gynecologists)** and standard textbooks like **Williams Obstetrics**, the first trimester is defined as the period from the first day of the last menstrual period (LMP) through **13 weeks and 6 days** of gestation. Therefore, the first trimester completes at the end of the 13th week, and the second trimester begins at **14 weeks**. **Analysis of Options:** * **14 weeks (Correct):** The first trimester spans from 0 to 13+6 weeks. The transition to the second trimester occurs at the 14-week mark. * **10 weeks (Incorrect):** This marks the end of the "organogenesis" or embryonic period. After 10 weeks, the embryo is technically referred to as a fetus. * **12 weeks (Incorrect):** While often used colloquially, 12 weeks is clinically inaccurate for the completion of the first trimester. However, it is a milestone for the disappearance of the corpus luteum and the full takeover of progesterone production by the placenta. * **13 weeks (Incorrect):** This is the final week of the first trimester, but the trimester is not "complete" until the end of this week (13 weeks 6 days). **High-Yield Clinical Pearls for NEET-PG:** * **Organogenesis:** Occurs between weeks 3 to 8 (embryonic period). This is the period of maximum susceptibility to teratogens. * **Nuchal Translucency (NT) Scan:** Ideally performed between **11 to 13+6 weeks**. * **Uterine Position:** The uterus becomes an abdominal organ after **12 weeks** (it is purely pelvic before this). * **Fetal Heart Sounds:** Can be heard via Doppler starting at **10–12 weeks**.

Question 359: Palmer's sign elicits:

A. Intermittent uterine contractions (Correct Answer)
B. Softening of the cervix
C. Pulsations in the fornix
D. Compressibility of the isthmus

Explanation: **Explanation:** **Palmer’s sign** refers to the regular and rhythmic **intermittent uterine contractions** that can be felt during a bimanual examination as early as **4 to 8 weeks** of gestation. These contractions are spontaneous and occur before the uterus becomes a purely abdominal organ. ### Analysis of Options: * **A. Intermittent uterine contractions (Correct):** This is the definitive clinical finding of Palmer's sign. These contractions are felt as the uterus alternately hardening and softening under the examining fingers. * **B. Softening of the cervix:** This is known as **Goodell’s sign**, typically appearing around 6 weeks of pregnancy. * **C. Pulsations in the fornix:** This is known as **Osiander’s sign**, caused by increased vascularity and blood flow through the uterine arteries felt in the lateral vaginal fornices. * **D. Compressibility of the isthmus:** This is known as **Hegar’s sign**, where the lower uterine segment (isthmus) feels extremely soft and compressible between 6 to 10 weeks of gestation. ### High-Yield Clinical Pearls for NEET-PG: * **Jacquemier’s / Chadwick’s Sign:** Bluish discoloration of the cervix, vagina, and labia due to venous congestion (appears at 6–8 weeks). * **Piskacek’s Sign:** Asymmetrical enlargement of the uterus if implantation occurs near one of the cornua. * **Ladins Sign:** Softening of the anterior midline of the uterus at the junction with the cervix (6 weeks). * **Timeline:** Most of these "probable" signs of pregnancy appear between **6 to 10 weeks** of gestation. Palmer's sign is one of the earliest, appearing as early as 4 weeks.

Question 360: A 30-year-old G1P0 woman complains of nausea and vomiting for the first 3 months of her pregnancy. She is noted to have a hemoglobin level of 9.0 g/dl and a mean corpuscular volume of 110 fL (normal 90-105 fL). Which of the following is the most likely etiology of the anemia?

A. Iron deficiency
B. Vitamin B12 deficiency
C. Folate deficiency (Correct Answer)
D. Physiologic anemia of pregnancy

Explanation: **Explanation:** The patient presents with **macrocytic anemia** (Hemoglobin 9.0 g/dL, MCV 110 fL) in the first trimester of pregnancy, complicated by nausea and vomiting. **1. Why Folate Deficiency is correct:** Folate deficiency is the **most common cause of megaloblastic anemia** during pregnancy. Pregnancy increases folate requirements five-fold to support rapid fetal growth and placental development. In this case, the patient’s persistent nausea and vomiting (likely *Hyperemesis Gravidarum*) further deplete folate stores due to poor oral intake and malabsorption. Unlike Vitamin B12, folate stores in the body are limited (lasting only 3–4 months), making deficiency manifest quickly under physiological stress. **2. Why the other options are incorrect:** * **Iron Deficiency:** This is the most common cause of anemia in pregnancy overall, but it typically presents as **microcytic hypochromic** anemia (low MCV). * **Vitamin B12 Deficiency:** While it also causes macrocytic anemia, it is rare in pregnancy because B12 stores are vast (lasting 3–5 years) and are usually only depleted in strict vegans or patients with gastric bypass/pernicious anemia. * **Physiologic Anemia:** This occurs due to a disproportionate increase in plasma volume compared to red cell mass. However, it is a **normocytic** anemia (normal MCV) and usually manifests more significantly in the second trimester. **Clinical Pearls for NEET-PG:** * **MCV >100 fL** in pregnancy should always trigger a workup for Megaloblastic Anemia. * **Peripheral Smear:** Look for hypersegmented neutrophils (earliest sign). * **Prophylaxis:** The WHO recommends **400 µg (0.4 mg)** of folic acid daily for all pregnant women to prevent Neural Tube Defects (NTDs). * **High-risk dose:** Women with a previous child with NTD or those on anti-epileptics require **4 mg** daily.

Practice by Chapter

Preconception Counseling

Practice Questions

Pregnancy Diagnosis and Dating

Practice Questions

Routine Antenatal Assessments

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Maternal Physiological Changes

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Nutrition in Pregnancy

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Screening Tests in Pregnancy

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Fetal Growth Assessment

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High-Risk Pregnancy Identification

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Antenatal Complications Management

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Psychosocial Aspects of Pregnancy

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