Prenatal Care Practice Questions

Q: Anencephaly is best diagnosed using which of the following methods?

Ultrasound (USG). **Explanation:** **Anencephaly** is a lethal neural tube defect (NTD) characterized by the absence of the cranial vault and cerebral hemispheres. **Why Ultrasound (USG) is the Correct Answer:** Ultrasound is the **gold standard and investigation of choice** for diagnosing anencephaly. It can reliably detect the condition as early as **11–14 weeks** (late first trimester). Key sonographic features include the absence of the calvarium above the orbits (the **"Frog-eye appearance"** or "Mickey Mouse sign") and the presence of a vascular stroma instead of brain tissue (*Area cerebrovasculosa*). Its high sensitivity (nearly 100%), non-invasive nature, and real-time visualization make it superior to biochemical markers. **Analysis of Incorrect Options:** * **Maternal Serum Alpha-Fetoprotein (MSAFP):** This is a **screening tool**, not a diagnostic one. While MSAFP is elevated in 80-90% of open NTDs, it requires confirmation via USG due to high false-positive rates (e.g., multiple gestations, incorrect dating). * **Amniotic Fluid Alpha-Fetoprotein (AFAFP):** This is more specific than MSAFP but requires an invasive procedure (amniocentesis). With the advancement of high-resolution USG, invasive testing for anencephaly is rarely necessary. * **X-ray:** Historically used to see the absence of the skull vault, it is now **obsolete** due to radiation risks and the superior diagnostic accuracy of USG. **Clinical Pearls for NEET-PG:** * **Earliest Diagnosis:** 11 weeks by USG. * **Associated Finding:** **Polyhydramnios** is common in the third trimester due to the fetus's inability to swallow amniotic fluid. * **Prevention:** Periconceptional **Folic Acid (400 mcg/day)** reduces the risk of NTDs. For women with a previous affected pregnancy, the dose is increased to **4 mg/day**. * **Management:** Since it is a lethal anomaly, termination of pregnancy is offered regardless of gestational age.

Q: Which of the following is not an indication for amniocentesis for chromosomal detection?

Gestational diabetes mellitus. **Explanation:** Amniocentesis is an invasive prenatal diagnostic procedure used primarily to obtain fetal cells for karyotyping and genetic analysis. The indications for chromosomal detection are based on an increased risk of aneuploidy or genetic disorders. **Why Gestational Diabetes Mellitus (GDM) is the correct answer:** GDM is a metabolic complication of pregnancy characterized by glucose intolerance. While GDM increases the risk of macrosomia, polyhydramnios, and neonatal hypoglycemia, it is **not** associated with an increased risk of fetal chromosomal anomalies. Therefore, GDM alone is not an indication for amniocentesis. **Analysis of Incorrect Options:** * **Previous Down’s syndrome child:** A history of a prior pregnancy affected by trisomy increases the recurrence risk, making genetic testing essential in subsequent pregnancies. * **Maternal age > 35 years:** Advanced maternal age is a classic indication due to the increased risk of non-disjunction during meiosis, leading to trisomies (e.g., Down syndrome). * **Parents with known chromosomal anomaly:** If either parent is a carrier of a balanced translocation or other structural rearrangements, there is a high risk of unbalanced gametes and fetal chromosomal defects. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Amniocentesis is ideally performed between **15–20 weeks** of gestation. * **Complication:** The most significant risk is procedure-related pregnancy loss (approx. 0.5%). * **Other Indications:** Assessment of fetal lung maturity (L/S ratio), diagnosis of fetal infections (CMV), and therapeutic drainage of polyhydramnios. * **Gold Standard:** While screening (Dual/Quadruple markers) provides risk probability, amniocentesis provides a **definitive diagnosis** via karyotyping or FISH.

Q: At which gestational age does the uterus reach the umbilical level?

24 weeks. **Explanation:** The height of the uterine fundus is a critical clinical marker used to assess fetal growth and gestational age during prenatal visits. **1. Why 24 weeks is correct:** By convention and clinical observation, the fundus of the uterus reaches the **level of the umbilicus at 24 weeks** of gestation. While some older textbooks previously cited 20–22 weeks, modern obstetric guidelines (including DC Dutta and Williams Obstetrics) standardize the umbilical level at 24 weeks for examination purposes. At this stage, the fundal height in centimeters (measured from the symphysis pubis) typically correlates 1:1 with the weeks of gestation. **2. Analysis of Incorrect Options:** * **16 weeks:** At this stage, the fundus is midway between the symphysis pubis and the umbilicus. * **20 weeks:** The fundus is generally 2 finger-breadths below the umbilicus. * **28 weeks:** The fundus is approximately 3 finger-breadths above the umbilicus (at the junction of the lower 2/3 and upper 1/3 of the distance between the umbilicus and the xiphisternum). **3. NEET-PG High-Yield Clinical Pearls:** * **12 weeks:** The uterus first becomes an abdominal organ (just palpable at the pubic symphysis). * **36 weeks:** The fundus reaches the highest point (xiphisternum). * **40 weeks:** The fundal height actually *drops* to the level of 32 weeks due to "lightening" (engagement of the fetal head), though the flanks will be full. * **Rule of Thumb:** If the fundal height is significantly greater than the dates, consider multiple pregnancy, polyhydramnios, or molar pregnancy. If less than dates, consider IUGR or oligohydramnios.

Q: Which of the following are signs considered positive in early pregnancy?

All of the above. In early pregnancy, the pelvic organs undergo significant physiological changes due to increased vascularity (hyperemia) and hormonal influences (estrogen and progesterone). These changes manifest as specific clinical signs during a bimanual examination. **Explanation of the Correct Answer:** The correct answer is **D (All of the above)** because Hegar’s, Palmer’s, Goodell’s, and Osiander’s signs are all classic clinical markers of early pregnancy: * **Hegar’s Sign:** Softening of the uterine isthmus. On bimanual examination, the upper part of the uterus and the cervix feel like two separate entities because the isthmus is so soft it cannot be felt. (Appears at 6–10 weeks). * **Palmer’s Sign:** Regular, rhythmic, painless uterine contractions felt during a digital examination. (Appears as early as 4–8 weeks). * **Goodell’s Sign:** Softening of the cervix. The cervix normally feels like the "tip of the nose," but in pregnancy, it feels like the "lips." (Appears at 6 weeks). * **Osiander’s Sign:** Increased pulsation felt through the lateral vaginal fornices due to increased vascularity of the uterine arteries. (Appears at 8 weeks). **Why other options are "wrong":** Options A, B, and C are individual components of the clinical picture. Since all three represent valid signs of early pregnancy, "All of the above" is the most comprehensive and correct choice. **High-Yield NEET-PG Clinical Pearls:** * **Chadwick’s Sign (Jacquemier’s Sign):** Bluish discoloration of the cervix, vagina, and labia due to venous congestion (8 weeks). * **Piskacek’s Sign:** Asymmetrical enlargement of the uterus if implantation occurs near the cornua. * **Internal Ballottement:** Can be elicited between 16–28 weeks. * **Ladins Sign:** Softening of the anterior midline of the uterus at the junction with the cervix (6 weeks).

Q: A woman has a history of 2 pregnancies. What is her gravidity?

G2. **Explanation:** The correct answer is **C. G2**. **Understanding the Concept:** In obstetrics, **Gravidity (G)** refers to the total number of times a woman has been pregnant, regardless of the duration or the outcome of those pregnancies (e.g., live birth, stillbirth, miscarriage, or ectopic pregnancy). Since the patient has a history of two pregnancies, she is classified as **Gravida 2 (G2)**. **Analysis of Options:** * **A. G0 (Nulligravida):** This term describes a woman who has never been pregnant. * **B. G1 (Primigravida):** This describes a woman who is pregnant for the first time or has been pregnant only once. * **D. G3 (Multigravida):** This would apply if the woman had a history of three pregnancies. **High-Yield Clinical Pearls for NEET-PG:** 1. **GTPAL System:** To provide a complete obstetric history, clinicians use the GTPAL acronym: * **G (Gravida):** Total pregnancies. * **T (Term):** Births at ≥37 weeks. * **P (Preterm):** Births between 20–36 weeks 6 days. * **A (Abortion/Loss):** Pregnancies ending before 20 weeks. * **L (Living):** Number of currently living children. 2. **Multiple Gestations:** Twins or triplets count as **one** pregnancy (G1) and **one** parous event (P1). Gravidity and Parity refer to the *episodes* of pregnancy, not the number of fetuses. 3. **Parity vs. Gravidity:** While Gravidity counts the number of times pregnant, **Parity** counts the number of pregnancies that reached the age of viability (typically 20 or 24 weeks depending on local guidelines), regardless of whether the child was born alive or stillborn.

Q: According to CDC recommendations, what is the recommended approach for HIV screening of pregnant women?

Opt-out testing. **Explanation:** The CDC and major international health guidelines (including NACO in India) recommend **Opt-out testing** as the standard of care for HIV screening in all pregnant women. **1. Why Opt-out testing is correct:** In an "Opt-out" approach, HIV testing is included in the standard battery of prenatal tests. The patient is informed that the test will be performed as part of routine care unless she specifically declines it. This approach is superior because it normalizes HIV testing, reduces the stigma associated with "risk-based" screening, and ensures maximum coverage. Identifying HIV-positive status early allows for the initiation of **Antiretroviral Therapy (ART)**, which can reduce the risk of mother-to-child transmission (MTCT) from ~25-40% to **less than 1%**. **2. Why other options are incorrect:** * **Opt-in testing:** Requires the patient to specifically request or sign a separate consent for the test after counseling. This often leads to lower testing rates due to perceived stigma or administrative hurdles. * **Compulsory testing:** Mandatory testing without consent violates patient autonomy and ethical standards. * **Symptomatic testing:** Waiting for symptoms to appear is dangerous in pregnancy, as many HIV-positive individuals are asymptomatic for years, during which time the virus can be transmitted to the fetus. **High-Yield Clinical Pearls for NEET-PG:** * **Repeat Testing:** A second test in the **third trimester** (before 36 weeks) is recommended for women at high risk of acquiring HIV. * **Window Period:** If a woman presents in labor with unknown status, a **Rapid HIV test** should be performed immediately. * **Breastfeeding:** In the Indian context (NACO guidelines), HIV-positive mothers are encouraged to exclusively breastfeed for the first 6 months while on ART, whereas in developed countries (CDC), breastfeeding is generally avoided if safe alternatives exist.

Q: Transabdominal CVS can be done in which gestational period?

11-13 weeks. **Explanation:** **Chorionic Villus Sampling (CVS)** is a prenatal diagnostic procedure used to obtain chorionic villi for genetic analysis. The correct timing for CVS is crucial to balance diagnostic accuracy with fetal safety. **1. Why 11–13 weeks is correct:** The standard window for performing CVS (both transabdominal and transcervical) is **10 to 13+6 weeks** of gestation. Performing the procedure during this period ensures there is sufficient placental tissue for sampling while minimizing risks to the developing fetus. The 11–13 week window is the most common clinical practice as it aligns with first-trimester screening protocols. **2. Why the other options are incorrect:** * **Options A, C, and D (Before 10 weeks):** Performing CVS before 10 weeks is contraindicated. Early CVS is strongly associated with **Limb Reduction Defects** (e.g., oromandibular-limb hypogenesis) due to vascular disruption during the critical period of limb development. It also carries a higher risk of miscarriage. **High-Yield Clinical Pearls for NEET-PG:** * **Advantage over Amniocentesis:** CVS can be performed earlier in pregnancy (1st trimester), allowing for earlier diagnosis and safer termination if required. * **Confined Placental Mosaicism (CPM):** This is a specific limitation of CVS where the chromosomal makeup of the placenta differs from the fetus, potentially leading to false-positive results. * **Rh Isoimmunization:** In Rh-negative unsensitized mothers, **Anti-D immunoglobulin** must be administered following the procedure to prevent sensitization. * **Amniocentesis Timing:** Usually performed between **15–20 weeks**. Early amniocentesis (before 15 weeks) is avoided due to risks of clubfoot (talipes equinovarus) and fetal loss.

Question 1

Anencephaly is best diagnosed using which of the following methods?

Accepted Answer

Ultrasound (USG)

Answer

Maternal serum alpha-fetoprotein

Answer

Amniotic fluid alpha-fetoprotein

Answer

X-ray

Question 2

Which of the following is not an indication for amniocentesis for chromosomal detection?

Accepted Answer

Gestational diabetes mellitus

Answer

Previous Down's syndrome child

Answer

Maternal age greater than 35 years

Answer

Parents with a known chromosomal anomaly

Question 3

The oxytocin challenge test for assessing fetal well-being is contraindicated in all except which of the following conditions?

Accepted Answer

Breech presentation

Answer

Placenta previa

Answer

Previous two lower segment caesarean sections

Answer

Premature labor

Question 4

What are the advantages of ultrasound nuchal translucency screening over biochemical screening for Down syndrome?

Accepted Answer

Offers better performance in multiple gestations.

Answer

Utilizes a transvaginal approach.

Answer

Provides more consistent measurements compared to laboratory tests.

Answer

Covers a wider gestational age range.

Question 5

At which gestational age does the uterus reach the umbilical level?

Accepted Answer

24 weeks

Answer

16 weeks

Answer

20 weeks

Answer

28 weeks

Question 6

Which of the following are signs considered positive in early pregnancy?

Accepted Answer

All of the above

Answer

Hegar's sign

Answer

Palmer's sign

Answer

Goodell's sign and Osiander's sign

Question 7

A woman has a history of 2 pregnancies. What is her gravidity?

Accepted Answer

G2

Answer

G0

Answer

G1

Answer

G3

Question 8

According to CDC recommendations, what is the recommended approach for HIV screening of pregnant women?

Accepted Answer

Opt-out testing

Answer

Opt-in testing

Answer

Compulsory testing

Answer

Symptomatic testing

Question 9

One of the parents has a balanced translocation between chromosome 15 and 21. What advice will you provide to the couple to prevent a child being born with Down syndrome?

Accepted Answer

Prenatal diagnosis and abortion

Answer

Artificial insemination with donor's sperm

Answer

Adoption

Answer

No need to worry as there is no increased risk

Question 10

Transabdominal CVS can be done in which gestational period?

Accepted Answer

11-13 weeks

Answer

7-9 weeks

Answer

8-9 weeks

Answer

Before 10 weeks

Prenatal Care — MCQs

Prenatal Care — MCQs

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