Prenatal Care Practice Questions

Q: Most common cause of first-trimester abortion is:

Genetic factors. ***Genetic factors*** - **Chromosomal abnormalities**, such as aneuploidies (e.g., **trisomy**), account for the majority of first-trimester spontaneous abortions. - These genetic errors often lead to **non-viable embryos**, resulting in early pregnancy loss as a natural selection mechanism. *Endocrine disorders* - While endocrine disorders like **luteal phase defect**, **uncontrolled diabetes**, or **thyroid dysfunction** can contribute to recurrent miscarriages, they are not the most common cause of *first-trimester abortions overall*. - Their impact is often more pronounced in **recurrent pregnancy loss** rather than sporadic first-trimester events. *Immunological disorders* - **Autoimmune disorders** such as **antiphospholipid syndrome** are important causes of **recurrent pregnancy loss** and can lead to first-trimester abortions. - However, they are **less common** than genetic factors as the primary cause of a single, sporadic first-trimester abortion. *Infection* - Certain **TORCH infections** (**T**oxoplasmosis, **O**ther [syphilis, varicella-zoster, parvovirus B19], **R**ubella, **C**ytomegalovirus, **H**erpes simplex virus) can cause miscarriage. - While significant, infections are a **less frequent cause** of first-trimester abortion compared to genetic anomalies.

Q: Most accurate method to confirm viable intrauterine pregnancy at 6 weeks' gestation is

USG fetal cardiac activity. **USG fetal cardiac activity** - At 6 weeks' gestation, the presence of **fetal cardiac activity** on ultrasound is the definitive sign of a **viable intrauterine pregnancy**. - This finding confirms both the presence of an embryo and its vital status, providing direct evidence of viability. *Urine HCG test* - A **urine HCG test** confirms the presence of pregnancy but does not provide information about its viability or location (intrauterine vs. ectopic). - High HCG levels can be present even in non-viable or ectopic pregnancies. *Clinical examination* - A **clinical examination** may reveal signs consistent with pregnancy, such as an enlarged uterus, but it cannot definitively confirm **intrauterine location** or **fetal viability** at 6 weeks' gestation. - These findings are supportive but not diagnostic of viability. *Doppler ultrasound in specific clinical situations* - Doppler ultrasound is typically used to assess **blood flow** to various structures and may be useful in later pregnancy for assessing fetal well-being or placental function. - It is not the primary or most accurate method to confirm early **fetal cardiac activity** or viability at 6 weeks' gestation compared to standard grayscale ultrasound.

Q: USG can detect a gestation sac earliest at what time?

5–6 weeks of gestation. ***5–6 weeks of gestation*** - A **gestation sac** is typically visible by **transvaginal ultrasound** when the **beta-hCG level** reaches approximately 1500-2000 mIU/mL, which corresponds to around **5 weeks of gestation**. - By **6 weeks**, a **yolk sac** and often a **fetal pole** with cardiac activity can be identified within the gestational sac. *7–8 weeks of gestation* - By this gestational age, the **embryo** and **cardiac activity** are clearly visible, and the **crown-rump length (CRL)** can be accurately measured for dating. - While a gestation sac is undoubtedly present, it would have been visible much earlier. *10 weeks of gestation* - At this stage, the **gestation sac** is significantly larger, and the **fetus** is well-defined, with developing limbs and organs. - This is far beyond the earliest detection window for a gestation sac. *12 weeks of gestation* - By **12 weeks**, the first-trimester screening, including **nuchal translucency** measurement, is often performed, meaning the pregnancy is well-established. - The gestation sac would have been visible for several weeks prior to this.

Q: What is the specific marker of neural tube defects?

Acetylcholinesterase. ***Acetylcholinesterase*** - **Acetylcholinesterase (AChE)** is a **highly specific marker** for **open neural tube defects (NTDs)** when detected in amniotic fluid. - Its presence indicates direct leakage from exposed neural tissue due to incomplete closure of the neural tube. - **Clinical context**: While **AFP (alpha-fetoprotein)** is used for screening, **AChE is the specific confirmatory marker** that distinguishes open NTDs from other causes of elevated AFP. - AChE testing helps reduce false positives from AFP screening alone. *Inhibin A* - **Inhibin A** is a serum marker used in **prenatal screening** for aneuploidies, such as Down syndrome (trisomy 21). - It is typically **elevated in Down syndrome** during second-trimester screening. - Not a specific marker for neural tube defects. *Pregnancy-associated plasma protein A* - **Pregnancy-associated plasma protein A (PAPP-A)** is a serum marker used in **first-trimester screening** for chromosomal abnormalities like Down syndrome. - It is usually **decreased in Down syndrome** but has no direct association with neural tube defects. *Estriol* - **Unconjugated estriol (uE3)** is a serum marker used in **second-trimester prenatal screening** (quad screen). - It is typically **decreased in Down syndrome and Edward syndrome (trisomy 18)**, but not specifically indicative of neural tube defects.

Q: The widest transverse diameter of the fetal skull is what?

Biparietal diameter (BPD). ***Biparietal diameter (BPD)*** - The **biparietal diameter** measures the distance between the two parietal eminences of the fetal skull, representing the widest transverse diameter. - This measurement is crucial for assessing fetal growth and is a key indicator during ultrasound examinations for dating pregnancy and estimating fetal weight. *Occipito-frontal diameter (OFD)* - The **occipito-frontal diameter** measures the distance from the occipital protuberance to the most prominent part of the frontal bone. - While an important longitudinal measurement, it does not represent the widest transverse diameter. *Bitemporal diameter (BTD)* - The **bitemporal diameter** measures the distance between the two temporal bones. - It is typically smaller than the biparietal diameter and is not considered the widest transverse diameter of the fetal skull. *Suboccipito-frontal diameter (SFD)* - The **suboccipito-frontal diameter** is a measurement taken from just below the occipital protuberance to the anterior fontanelle. - This diameter is relevant in specific fetal head positions during labor but is not the widest transverse diameter.

Q: Alpha-fetoproteins are not increased in which of the following conditions?

Post maturity. ***Correct: Post maturity*** - In **post-maturity**, the fetus continues to develop past the expected due date (>42 weeks) - **Alpha-fetoprotein (AFP)** levels are **not elevated** in post-term pregnancies - AFP levels may actually decline as pregnancy progresses beyond term - Post-maturity is associated with placental insufficiency, not AFP elevation *Incorrect: Spina bifida* - **Spina bifida** is an **open neural tube defect** where the spinal cord is exposed - Leads to direct leakage of AFP into the amniotic fluid and maternal serum - Causes **significantly elevated AFP levels** (typically >2.5 MoM) *Incorrect: Omphalocele* - **Omphalocele** is an **abdominal wall defect** where abdominal organs herniate through the umbilicus - Covered by a membrane, but still allows AFP leakage - Associated with **elevated maternal serum AFP levels** - AFP elevation is less pronounced than with neural tube defects *Incorrect: Anencephaly* - **Anencephaly** is a severe **open neural tube defect** with absence of major portions of the brain and skull - Results in direct exposure of neural tissue to amniotic fluid - One of the **most common causes of markedly elevated AFP** (often >3-4 MoM) - Almost always detectable by elevated maternal serum AFP screening

Q: A pregnant woman in the third trimester has normal blood pressure when standing and sitting. When supine, her blood pressure drops to 90/50. What is the diagnosis?

Compression of IVC (inferior vena cava). ***Compression of IVC (inferior vena cava)*** - Compression of the **inferior vena cava** by the gravid uterus in the supine position reduces **venous return** to the heart, leading to decreased **cardiac output** and a drop in blood pressure. - This phenomenon is known as **supine hypotensive syndrome** or **vena caval syndrome** and is common in the third trimester. *Compression of the aorta* - While the gravid uterus can cause some degree of **aortic compression**, it typically affects blood flow to the lower extremities and may lead to **aortocaval compression syndrome**, but it doesn't primarily account for a systemic drop in blood pressure in the same way as IVC compression. - Aortic compression primarily results in reduced **femoral pulses** or differences in blood pressure between the arms and legs, not generalized hypotension. *Compression of internal iliac vessels (localized effects)* - Compression of internal iliac vessels would primarily lead to **localized symptoms** such as **pelvic pain** or **venous congestion** in the lower extremities, not a systemic drop in blood pressure. - The internal iliac vessels are smaller and their compression does not significantly impact overall venous return to the heart. *Compression of the uterine artery* - Compression of the uterine artery would primarily affect **blood supply to the uterus** and placenta, potentially leading to **fetal compromise**, but it does not directly cause systemic maternal hypotension. - While important for fetal well-being, it does not explain the maternal hypotensive episode observed when supine.

Q: Which of the following values is MOST accurate for the recommended dietary allowance during pregnancy?

350 kcal additional energy. ***350 kcal additional energy*** - The **ICMR 2020 guidelines** recommend an additional **350 kcal/day** during pregnancy, making this the most accurate match among all options. - This additional energy requirement supports **fetal growth**, **maternal metabolic changes**, and **increased blood volume** during pregnancy. *30 mg iron* - The recommended daily allowance for **iron** during pregnancy is **27 mg/day**, not 30 mg according to standard guidelines. - While close to the actual requirement, **30 mg exceeds the RDA** and represents a therapeutic supplementation dose rather than the precise dietary allowance. *500 µg folic acid* - The recommended daily intake of **folic acid** during pregnancy is **600 µg/day** to prevent **neural tube defects**. - **500 µg is significantly below the RDA** by 100 µg (approximately 17% less than recommended), making this inadequate for optimal fetal development. *310 mg magnesium* - The recommended daily allowance for **magnesium** during pregnancy is **340 mg/day** according to standard dietary guidelines. - **310 mg is 30 mg below the RDA** (approximately 9% less than recommended), making this the least accurate option among all choices.

Q: Which of the following represents the current recommendation for offering screening for Down's syndrome during pregnancy?

All pregnant women. ***All pregnant women*** - The American College of Obstetricians and Gynecologists (ACOG) and other major medical bodies recommend that **all pregnant women**, regardless of age, be offered **screening for Down syndrome** and other aneuploidies. - This recommendation reflects the principle of **patient autonomy** and the availability of safe and effective screening methods for all pregnancies, not just those considered high-risk based on maternal age. *30* - While the risk of Down syndrome increases with maternal age, **screening is not exclusively recommended for women aged 30**; rather, it is offered to all pregnant women. - Focusing only on this age group would **miss cases** in younger women and limit informed decision-making. *35* - Historically, **maternal age 35** was considered the threshold for offering invasive diagnostic testing (e.g., amniocentesis) due to the significantly increased risk of Down syndrome. - However, current guidelines emphasize **universal screening for all pregnant women**, as a substantial number of babies with Down syndrome are born to women **younger than 35** due to higher birth rates in this group. *No screening necessary* - This option is incorrect as **screening is routinely offered** to all pregnant women to provide information about the risk of conditions like Down syndrome. - Deciding to forgo screening or diagnostic testing is a personal choice, but the **option to screen should always be available** to the patient.

Q: What is the minimum parity for a woman to be classified as a grand multipara?

Para 5. ***Para 5 (5 or more deliveries)*** - A woman is classified as a **grand multipara** when she has had **five or more previous deliveries** at ≥20 weeks of gestation. - The term specifically refers to **parity** (number of deliveries), not gravidity (number of pregnancies). - This classification helps identify pregnancies at potentially higher risk for certain complications including postpartum hemorrhage, abnormal placentation, and uterine rupture. *Para 3* - A woman with three previous deliveries is typically referred to as a **multipara**, not a grand multipara. - The term "grand multipara" specifically denotes a higher parity threshold. *Para 4* - A woman with four previous deliveries is still considered a **multipara** and does not meet the criteria for grand multiparity. - The threshold for grand multiparity is strictly defined as five or more deliveries at ≥20 weeks gestation. *Para 6* - While six deliveries certainly qualifies a woman as a grand multipara, it is not the **minimum number** for the classification. - The definition starts at five previous deliveries, making para 5 the minimum threshold.

Question 1

Most common cause of first-trimester abortion is:

Accepted Answer

Genetic factors

Answer

Endocrine disorders

Answer

Immunological disorders

Answer

Infection

Question 2

Most accurate method to confirm viable intrauterine pregnancy at 6 weeks' gestation is

Accepted Answer

USG fetal cardiac activity

Answer

Clinical examination

Answer

Urine HCG test

Answer

Doppler ultrasound in specific clinical situations

Question 3

USG can detect a gestation sac earliest at what time?

Accepted Answer

5–6 weeks of gestation

Answer

7–8 weeks of gestation

Answer

10 weeks of gestation

Answer

12 weeks of gestation

Question 4

What is the specific marker of neural tube defects?

Accepted Answer

Acetylcholinesterase

Answer

Inhibin A

Answer

Pregnancy-associated plasma protein A

Answer

Estriol

Question 5

The widest transverse diameter of the fetal skull is what?

Accepted Answer

Biparietal diameter (BPD)

Answer

Occipito-frontal diameter (OFD)

Answer

Bitemporal diameter (BTD)

Answer

Suboccipito-frontal diameter (SFD)

Question 6

Alpha-fetoproteins are not increased in which of the following conditions?

Accepted Answer

Post maturity

Answer

Omphalocele

Answer

Anencephaly

Answer

Spina bifida

Question 7

A pregnant woman in the third trimester has normal blood pressure when standing and sitting. When supine, her blood pressure drops to 90/50. What is the diagnosis?

Accepted Answer

Compression of IVC (inferior vena cava)

Answer

Compression of internal iliac vessels (localized effects)

Answer

Compression of the aorta

Answer

Compression of the uterine artery

Question 8

Which of the following values is MOST accurate for the recommended dietary allowance during pregnancy?

Accepted Answer

350 kcal additional energy

Answer

30 mg iron

Answer

500 µg folic acid

Answer

310 mg magnesium

Question 9

Which of the following represents the current recommendation for offering screening for Down's syndrome during pregnancy?

Accepted Answer

All pregnant women

Answer

35

Answer

No screening necessary

Answer

30

Question 10

What is the minimum parity for a woman to be classified as a grand multipara?

Accepted Answer

Para 5

Answer

Para 3

Answer

Para 4

Answer

Para 6

Prenatal Care — MCQs

Prenatal Care — MCQs

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