Prenatal Care Practice Questions

Q: A reduction in which of the following clotting factors is consistent with normal pregnancy?

Factor XIII. **Explanation:** Pregnancy is a **hypercoagulable state** characterized by an increase in most procoagulant factors and a decrease in natural anticoagulants. This physiological adaptation serves to minimize blood loss during placental separation at delivery. **Why Factor XIII is correct:** While most clotting factors increase during pregnancy, **Factor XIII (Fibrin-stabilizing factor) and Factor XI are notable exceptions.** Factor XIII levels actually **decrease** by approximately 20–30% during a normal pregnancy. This reduction is thought to be due to its consumption at the placental site, where it plays a role in maintaining the integrity of the feto-maternal interface and placental attachment. **Why the other options are incorrect:** * **A. Fibrinogen (Factor I):** This is the most significantly increased factor in pregnancy. Levels rise by nearly 50%, often reaching 400–600 mg/dL (compared to 200–400 mg/dL in non-pregnant states). * **C. Factor VIII:** Levels of Factor VIII and von Willebrand factor (vWF) increase markedly, which is why patients with mild von Willebrand disease often see symptom improvement during pregnancy. * **D. Factor X:** Along with Factors VII, IX, and XII, Factor X levels increase significantly to support the prothrombotic shift. **NEET-PG High-Yield Pearls:** 1. **Factors that INCREASE:** I, VII, VIII, IX, X, XII, and vWF. 2. **Factors that DECREASE:** XI, XIII, and **Antithrombin III**. 3. **Factors that remain UNCHANGED:** II (Prothrombin), V, and IX (though some texts suggest a slight rise in IX). 4. **Protein S:** Levels of **Free Protein S decrease** significantly (a common exam trap), while Protein C remains relatively constant. 5. **ESR:** The rise in Fibrinogen causes a physiological increase in the Erythrocyte Sedimentation Rate (ESR) during pregnancy.

Q: Which of the following tests has the highest detection rate for Down's syndrome?

Integrated screening. **Explanation:** The detection rate for Down syndrome (Trisomy 21) depends on the number of markers used and the timing of the screening. **Integrated Screening** is the most effective non-invasive biochemical screening method because it combines data from both the first and second trimesters. **Why Integrated Screening is Correct:** Integrated screening involves a two-stage process: 1. **First Trimester:** Nuchal Translucency (NT) ultrasound and Pregnancy-Associated Plasma Protein-A (PAPP-A). 2. **Second Trimester:** Quadruple marker test. By integrating these results, the **detection rate reaches approximately 94–96%** with a low false-positive rate (5%). It is superior because it captures the physiological changes across two distinct gestational windows. **Analysis of Incorrect Options:** * **Maternal serum AFP (MSAFP):** Used primarily to screen for Neural Tube Defects (NTD). In Down syndrome, AFP is decreased, but as a standalone marker, its detection rate is very low (~20-30%). * **Quadruple Marker Test:** Performed between 15–20 weeks (AFP, hCG, uE3, and Inhibin-A). While better than the triple test, its detection rate is only about **81%**. * **hCG levels:** While hCG is characteristically elevated in Down syndrome pregnancies, it is only one component of screening. Using it alone is clinically insufficient for diagnosis. **NEET-PG High-Yield Pearls:** * **Best Screening Test (Overall):** Combined Screening (NT + PAPP-A + hCG) is the standard first-trimester screen (85% detection). * **Most Sensitive Screen:** Cell-free DNA (cfDNA/NIPT) has the highest detection rate (>99%), but among the *biochemical/integrated* options listed, Integrated Screening is the answer. * **Down Syndrome Marker Profile:** ↓ AFP, ↓ uE3, **↑ hCG, ↑ Inhibin-A**, and ↑ NT thickness.

Q: Alpha-feto-protein levels are typically lowered in which of the following conditions?

Down's syndrome. **Explanation:** Alpha-fetoprotein (AFP) is a glycoprotein synthesized initially by the yolk sac and later by the fetal liver. It is the fetal equivalent of albumin. Monitoring Maternal Serum Alpha-Fetoprotein (MSAFP) levels is a crucial screening tool during the second trimester (15–20 weeks). **Why Down’s Syndrome is Correct:** In pregnancies affected by **Down’s syndrome (Trisomy 21)**, MSAFP levels are characteristically **decreased** (typically <0.5 MoM). While the exact pathophysiology is not fully understood, it is attributed to reduced synthesis by the fetal liver and a smaller-than-normal yolk sac. In a "Triple Test" for Down’s syndrome, you will typically see: * **Low AFP** * **Low Unconjugated Estriol (uE3)** * **High hCG** **Why the Other Options are Incorrect:** * **Anencephaly & Anterior Abdominal Wall Defects (e.g., Gastroschisis, Omphalocele):** These conditions involve "open" defects where fetal serum leaks directly into the amniotic fluid, leading to significantly **elevated** MSAFP levels. * **Renal Anomalies:** Conditions like congenital nephrosis or urinary tract obstructions lead to increased excretion of AFP into the amniotic fluid, resulting in **elevated** levels. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of increased MSAFP:** Incorrect gestational age (dating error). * **Elevated AFP (>2.5 MoM):** Neural tube defects (Anencephaly, Spina bifida), abdominal wall defects, multiple gestations, and fetal demise. * **Decreased AFP:** Down’s syndrome, Edward’s syndrome (Trisomy 18), gestational trophoblastic disease, and maternal obesity. * **Mnemonic for Down’s (Triple Test):** "HI" – **H**CG and **I**nhibin-A are **High**; the rest (AFP, uE3) are low.

Q: What changes occur in iron metabolism during pregnancy?

Increase in total iron-binding capacity. During pregnancy, the maternal body undergoes significant hematological adaptations to support the growing fetus and placenta. **Explanation of the Correct Answer (D):** The correct answer is an **increase in total iron-binding capacity (TIBC)**. TIBC is a functional measurement of **Transferrin**, the protein responsible for transporting iron in the blood. During pregnancy, the liver increases the synthesis of transferrin (stimulated by rising estrogen levels). Simultaneously, maternal iron stores are depleted as iron is diverted to the fetus and used for the 30% expansion of maternal red cell mass. As serum iron levels fall and transferrin levels rise, the "capacity" to bind iron increases, leading to a characteristic rise in TIBC. **Why the other options are incorrect:** * **A. Serum Iron:** This **decreases** during pregnancy because the rate of iron transfer to the fetus and its utilization for maternal erythropoiesis exceeds the rate of absorption and mobilization from stores. * **B. Serum Vitamin B12:** Levels typically **decrease** during pregnancy due to hemodilution (increased plasma volume) and increased fetal uptake. * **C. Folate in blood:** Serum folate levels usually **decrease** due to increased demand for DNA synthesis in the fetus and placenta, as well as increased renal clearance. **High-Yield NEET-PG Pearls:** * **Plasma Volume vs. Red Cell Mass:** Plasma volume increases by ~50%, while red cell mass increases by only ~20-30%. This discrepancy leads to **Physiological Anemia of Pregnancy**. * **Iron Requirements:** Total iron requirement during pregnancy is approximately **1000 mg** (300 mg for fetus/placenta, 500 mg for maternal RBC expansion, 200 mg for normal losses). * **Best Indicator of Iron Deficiency:** Serum **Ferritin** is the most sensitive marker for diagnosing iron deficiency anemia in pregnancy (levels <15-30 µg/L).

Q: A negative pregnancy test excludes the diagnosis of which type of abortion?

Threatened abortion. ### Explanation **1. Why Threatened Abortion is the Correct Answer:** A **threatened abortion** is clinically defined as vaginal bleeding occurring in the presence of a **viable** intrauterine pregnancy before 20 weeks of gestation. For a pregnancy to be viable and ongoing, the trophoblastic tissue must be actively producing Human Chorionic Gonadotropin (hCG). Therefore, a **positive pregnancy test is a prerequisite** for the diagnosis. If the pregnancy test is negative, it implies there is no living trophoblastic tissue or active pregnancy, thereby excluding a "threatened" state. **2. Why the Other Options are Incorrect:** * **Ectopic Pregnancy:** While a pregnancy test is usually positive in ectopic pregnancies, it can occasionally be **false-negative** (especially with low-sensitivity urine tests) if the hCG levels are very low (e.g., in a chronic or ruptured ectopic pregnancy where trophoblastic activity has ceased). Thus, a negative test does not 100% exclude an ectopic pregnancy in a clinical emergency. * **Complete Abortion:** Though not an option here, it is important to note that in a complete abortion, the pregnancy test may remain positive for several days to weeks until hCG is cleared from the system. **3. NEET-PG High-Yield Pearls:** * **Definition:** In threatened abortion, the internal os remains **closed**, and fetal heart sound (FHS) is present on ultrasound. * **hCG Sensitivity:** Modern Urine Pregnancy Tests (UPT) can detect hCG levels as low as 20–25 mIU/ml. * **Management:** The mainstay of treatment for threatened abortion is **bed rest** and occasionally progestogens; however, 50% of these cases may progress to inevitable abortion. * **Rule of Thumb:** Any woman of reproductive age with amenorrhea and abdominal pain must be evaluated for pregnancy. If the test is negative but clinical suspicion is high for ectopic pregnancy, a **Serum β-hCG** (more sensitive) and Transvaginal Scan (TVS) are mandatory.

Q: The softening of the uterus with lateral implantation is called as?

Piskacek's sign. **Explanation:** The correct answer is **Piskacek's sign**. This clinical sign occurs during early pregnancy (usually around 7–10 weeks) due to the asymmetrical growth of the uterus. When the embryo implants laterally near one of the cornua (the junction of the fallopian tube and uterus), that specific area becomes soft and prominent, leading to a palpable bulge or "asymmetrical softening" of the uterus. **Analysis of Options:** * **Piskacek's sign (Correct):** Asymmetrical enlargement and softening of the uterus due to lateral implantation. * **Chadwick's sign:** A bluish discoloration of the cervix, vagina, and labia minora caused by increased vascularity (venous congestion). It is an early sign of pregnancy, typically appearing around 6–8 weeks. * **Hegar's sign:** Softening of the **isthmus** (the lower segment of the uterus). On bimanual examination, the upper body of the uterus and the cervix feel like two separate entities because the tissue between them is so soft. * **Goodell's sign:** Significant softening of the **vaginal portion of the cervix** (often described as feeling like the "lips" rather than the "tip of the nose"). **High-Yield Clinical Pearls for NEET-PG:** * **Palmer’s Sign:** Regular, rhythmic uterine contractions felt during a pelvic examination in early pregnancy (4–8 weeks). * **Osiander’s Sign:** Increased pulsation felt through the lateral vaginal fornices due to increased vascularity (8 weeks). * **Ladid’s Sign:** Softening of the anterior midline of the uterus at the cervico-uterine junction (6 weeks). * **Jacquemier’s Sign:** Another name for Chadwick’s sign (bluish discoloration of the vaginal mucosa).

Q: Which of the following ultrasound features identified during the second trimester is NOT a marker of Down syndrome?

Choroid plexus cyst. **Explanation:** The correct answer is **B. Choroid plexus cyst**. In prenatal screening, ultrasound "soft markers" are used to assess the risk of chromosomal abnormalities. While a **Choroid plexus cyst (CPC)** is a classic soft marker, it is strongly and specifically associated with **Trisomy 18 (Edwards Syndrome)**, not Trisomy 21 (Down Syndrome). In the absence of other structural anomalies, an isolated CPC carries a very low risk for Down syndrome. **Analysis of other options:** * **Single Umbilical Artery (SUA):** While often isolated, SUA is associated with various aneuploidies, including Trisomy 21, 18, and 13. * **Diaphragmatic Hernia:** Though more common in Trisomy 18, it is a documented structural association with Down syndrome. * **Duodenal Atresia:** This is a **highly specific** marker for Down syndrome. Approximately 30% of fetuses with duodenal atresia have Trisomy 21, often visualized on ultrasound as the "double bubble" sign. **High-Yield NEET-PG Pearls:** * **Most sensitive marker for Down Syndrome (2nd Trimester):** Increased Nuchal Fold thickness (≥ 6 mm). * **Most specific marker for Down Syndrome:** Duodenal atresia. * **Other common markers:** Echogenic intracardiac focus (EIF), pyelectasis, short femur/humerus, and hyperechoic bowel. * **Trisomy 18 markers:** Choroid plexus cysts, clenched fists (overlapping fingers), rocker-bottom feet, and micrognathia.

Q: Which of the following is LEAST likely to be observed in a normal pregnancy?

Decrease in systolic pressure. In a normal pregnancy, the cardiovascular system undergoes significant physiological adaptations to meet the metabolic demands of the mother and fetus. **Explanation of the Correct Answer:** **Option D (Decrease in systolic pressure)** is the correct answer because, in a normal pregnancy, **systolic blood pressure (SBP) remains relatively stable** or shows only a minimal decrease (2–5 mmHg). In contrast, **Diastolic Blood Pressure (DBP)** decreases significantly (up to 10–15 mmHg) due to a marked reduction in Systemic Vascular Resistance (SVR) caused by progesterone-mediated vasodilation and the low-resistance placental circuit. Therefore, a significant decrease in systolic pressure is *least* likely compared to the other physiological changes listed. **Analysis of Incorrect Options:** * **A. Increase in blood volume:** Plasma volume increases by 40–50%, starting as early as 6 weeks, to support fetal growth and protect against blood loss during delivery. * **B. Increase in cardiac output:** Cardiac output increases by 30–50% due to an increase in both stroke volume (early pregnancy) and heart rate (late pregnancy). * **C. Increase in heart rate:** The resting heart rate typically increases by 10–20 beats per minute by the third trimester. **High-Yield NEET-PG Pearls:** * **Blood Pressure Nadir:** The lowest blood pressure is recorded in the **second trimester** (around 24–28 weeks). * **Pulse Pressure:** Since DBP falls more than SBP, the **pulse pressure widens** during pregnancy. * **Supine Hypotension Syndrome:** Occurs due to the gravid uterus compressing the inferior vena cava (IVC), reducing venous return and cardiac output. * **Apex Beat:** Displaced **upward and laterally** (to the 4th intercostal space) due to the elevation of the diaphragm.

Question 1

A reduction in which of the following clotting factors is consistent with normal pregnancy?

Accepted Answer

Factor XIII

Answer

Fibrinogen

Answer

Factor VIII

Answer

Factor X

Question 2

Which of the following tests has the highest detection rate for Down's syndrome?

Accepted Answer

Integrated screening

Answer

Maternal serum AFP

Answer

Quadruple marker test

Answer

hCG levels

Question 3

Alpha-feto-protein levels are typically lowered in which of the following conditions?

Accepted Answer

Down's syndrome

Answer

Renal anomalies

Answer

Anterior abdominal wall defects

Answer

Anencephaly

Question 4

What changes occur in iron metabolism during pregnancy?

Accepted Answer

Increase in total iron-binding capacity

Answer

Increase in serum iron

Answer

Increase in serum vitamin B12

Answer

Increase in folate in blood

Question 5

A 35-year-old female, who previously had a child with Down syndrome, becomes pregnant. Amniocentesis is performed to screen for Down syndrome in the current pregnancy. What is the most appropriate gestational age for performing amniocentesis?

Accepted Answer

15-20 weeks

Answer

6-8 weeks

Answer

10-12 weeks

Answer

24-28 weeks

Question 6

A negative pregnancy test excludes the diagnosis of which type of abortion?

Accepted Answer

Threatened abortion

Answer

Ectopic pregnancy

Answer

Both

Answer

None

Question 7

Many professional organizations recommend that all pregnant women be routinely counseled about HIV infection and be encouraged to be tested. What is the most important reason for early identification of HIV infection in pregnant women?

Accepted Answer

Zidovudine therapy can be offered to reduce the chance of transmission of HIV to the newborn.

Answer

A cesarean section can be planned to reduce HIV transmission to the newborn.

Answer

Breast feeding can be discouraged to reduce transmission to the newborn.

Answer

Early identification of a newborn at risk of HIV infection will improve survival.

Question 8

The softening of the uterus with lateral implantation is called as?

Accepted Answer

Piskacek's sign

Answer

Chadwick's sign

Answer

Hegar's sign

Answer

Goodell's sign

Question 9

Which of the following ultrasound features identified during the second trimester is NOT a marker of Down syndrome?

Accepted Answer

Choroid plexus cyst

Answer

Single umbilical artery

Answer

Diaphragmatic hernia

Answer

Duodenal atresia

Question 10

Which of the following is LEAST likely to be observed in a normal pregnancy?

Accepted Answer

Decrease in systolic pressure

Answer

Increase in blood volume

Answer

Increase in cardiac output

Answer

Increase in heart rate

Prenatal Care — MCQs

Prenatal Care — MCQs

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