Prenatal Care Practice Questions

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: 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: 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.

Q: All are cardiovascular system changes in pregnancy except.

Increase in peripheral resistance. ***Increase in peripheral resistance*** - During normal pregnancy, **peripheral vascular resistance actually decreases** due to the effects of hormones like progesterone and the presence of the low-resistance uteroplacental circulation. - This decrease in resistance helps accommodate the increased blood volume and cardiac output. *Increase in cardiac output* - **Cardiac output increases significantly** during pregnancy (by 30-50%) to meet the metabolic demands of the growing fetus and maternal tissues. - This is primarily achieved through an increase in both stroke volume and heart rate. *Increase in blood volume* - **Blood volume increases substantially** (by 30-50%) during pregnancy, with plasma volume increasing more than red blood cell mass. - This expansion supports the increased cardiac output and placental perfusion. *Increase in heart rate* - **Heart rate increases** during pregnancy, typically by 10-20 beats per minute, contributing to the overall increase in cardiac output. - This physiological adaptation helps maintain adequate circulation.

Q: A woman attends an antenatal clinic with a complaint of mild pain in the lower abdomen on the left side, her periods are regular, and a urine pregnancy test was positive at home. A transvaginal ultrasound was performed, revealing an empty uterine cavity and no adnexal mass. Her serum beta human chorionic gonadotropin (hCG) level is 700 IU/L. What is the next step?

Perform serum beta HCG after 48 hr. ***Perform serum beta HCG after 48 hr*** - An **empty uterine cavity** with a **hCG level of 700 IU/L** and no adnexal mass is inconclusive for a definitive diagnosis of ectopic pregnancy or intrauterine pregnancy. - Repeating the **hCG level after 48 hours** is crucial to assess its doubling time, which helps differentiate between a normal intrauterine pregnancy, failed pregnancy, or ectopic pregnancy. *Give single dose of methotrexate* - Administering methotrexate requires a **definitive diagnosis of ectopic pregnancy**, which is not yet established given the inconclusive ultrasound and hCG level. - Giving methotrexate prior to a definitive diagnosis would be **premature and potentially harmful** if the pregnancy were intrauterine or a failed pregnancy. *Perform laparoscopy* - **Laparoscopy is an invasive procedure** typically reserved for cases where ectopic pregnancy is strongly suspected or rupture is a concern, or when medical management fails. - At this stage, with an **unclear diagnosis and stable patient**, less invasive diagnostic steps are warranted first. *Perform serum Beta HCG after 7 days* - Waiting 7 days to re-check hCG levels would be **too long** in a potentially developing abnormal pregnancy or ectopic pregnancy. - A **48-hour interval** provides more timely information to guide management and detect rapid changes in hCG, which is critical for early diagnosis and intervention.

Q: Most appropriate time for chorionic villus sampling in pregnancy is:

10-13 weeks. ***10-13 weeks*** - Chorionic villus sampling (CVS) is optimally performed between **10 and 13 completed weeks of gestation**. - This timing allows for **earlier diagnosis** of chromosomal abnormalities compared to amniocentesis, enabling more time for decision-making. *16-18 weeks* - This timeframe is typically used for **amniocentesis**, which is performed later in pregnancy. - Performing CVS at this stage is **outside the optimal window** and carries a higher risk profile for CVS specifically. *16-20 weeks* - This period is also generally recommended for **amniocentesis**, not chorionic villus sampling. - Delaying CVS until this point **reduces the advantage** of early diagnosis and may increase procedural risks. *8-10 weeks* - Performing CVS **before 10 weeks of gestation** is associated with a **higher risk of limb reduction defects** in the fetus. - Due to this significant risk, CVS is generally **contraindicated** before 10 weeks.

Question 1

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 2

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 3

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

Accepted Answer

Post maturity

Answer

Omphalocele

Answer

Anencephaly

Answer

Spina bifida

Question 4

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 5

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 6

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 7

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

Question 8

All are cardiovascular system changes in pregnancy except.

Accepted Answer

Increase in peripheral resistance

Answer

Increase in blood volume

Answer

Increase in heart rate

Answer

Increase in cardiac output

Question 9

A woman attends an antenatal clinic with a complaint of mild pain in the lower abdomen on the left side, her periods are regular, and a urine pregnancy test was positive at home. A transvaginal ultrasound was performed, revealing an empty uterine cavity and no adnexal mass. Her serum beta human chorionic gonadotropin (hCG) level is 700 IU/L. What is the next step?

Accepted Answer

Perform serum beta HCG after 48 hr

Answer

Give single dose of methotrexate

Answer

Perform laparoscopy

Answer

Perform serum beta HCG after 7 days

Question 10

Most appropriate time for chorionic villus sampling in pregnancy is:

Accepted Answer

10-13 weeks

Answer

16-18 weeks

Answer

16-20 weeks

Answer

8-10 weeks

Prenatal Care — MCQs

Prenatal Care — MCQs

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