Prenatal Care Practice Questions

Q: Ideal time to do Glucose challenge test in pregnancy is?

24-28 weeks. ***24-28 weeks*** - This is the **standard screening window** for gestational diabetes mellitus (GDM) using the 50-gram glucose challenge test. - During this period, **insulin resistance** in pregnancy typically becomes more pronounced, making it the optimal time to detect GDM. *12-16 weeks* - This early gestational period is usually **too soon** to reliably detect gestational diabetes in most women. - Significant insulin resistance associated with late pregnancy often has not yet developed. *20-24 weeks* - While sometimes considered, this window is **still a bit early** for routine GDM screening. - The sensitivity for detecting gestational diabetes is generally lower compared to the 24-28 week period. *30-34 weeks* - Screening during this period is generally **too late** for initial detection and management of GDM. - Delayed diagnosis could lead to adverse maternal and fetal outcomes that might have been prevented with earlier intervention.

Q: At what week post fertilization does the embryo transition to being called a fetus?

8 weeks. ***8 weeks*** - The transition from an embryo to a **fetus** occurs at the end of the **8th week post-fertilization**. - By this point, all major organ systems have begun to form, and the developing organism enters a period of growth and maturation. *6 weeks* - At 6 weeks post-fertilization, the developing organism is still considered an **embryo**. - During this stage, critical processes like **neural tube closure** and early heart development are occurring. *10 weeks* - By 10 weeks post-fertilization, the organism is firmly established as a **fetus**. - This period is characterized by further development and refinement of organs and systems. *12 weeks* - At 12 weeks post-fertilization, the developing organism is a **fetus**. - This marks the end of the first trimester, with significant growth and movement becoming possible.

Q: Among the following sites, which is the most common location for implantation within the uterine cavity?

Fundus of uterus. ***Fundus of uterus*** - Among the given options, the **fundus of the uterus** is the correct answer as it represents normal **intrauterine implantation**. - The blastocyst typically implants in the **upper part of the uterine body**, which includes the fundal and upper anterior/posterior wall regions, where there is a thick **endometrial lining** and rich **blood supply**. - Implantation in the uterine body/fundus ensures proper **placentation** and minimizes risks of complications like **placenta previa**. - Note: The most common specific site is the upper/middle posterior wall, but fundal implantation is within the normal range. *Fallopian tube ampullary part* - The **ampulla** is the most common site for **fertilization**, not implantation. - If implantation occurs here, it results in an **ectopic pregnancy** (ampullary tubal pregnancy), which is pathological and requires intervention. - This is the most common location for ectopic pregnancies, but not normal implantation. *Fallopian tube isthmus* - Implantation in the **isthmus** of the fallopian tube is another form of **ectopic pregnancy**. - This location has a higher risk of early **tubal rupture** and life-threatening hemorrhage due to the narrow diameter of the isthmus. - This is a dangerous ectopic site, not a normal implantation location. *Cornu of uterus* - The **cornu** (uterine horn/angle) is a rare and high-risk site for implantation within the uterus. - **Cornual/interstitial pregnancy** carries significant risks including uterine rupture as pregnancy progresses due to the thinner myometrium in this region. - While technically intrauterine, it is considered an abnormal and dangerous location compared to the main uterine body/fundus.

Q: Which of the following findings on first trimester ultrasound is indicative of a poor prognosis?

Absence of cardiac activity at 8 weeks of gestation. ***Absence of cardiac activity at 8 weeks of gestation*** - The absence of **fetal cardiac activity** at 8 weeks of gestation, when a fetal pole of at least **7 mm** should have clearly visible cardiac motion, definitively indicates a **non-viable pregnancy** and a poor prognosis. - At this gestational age, a visible heartbeat is a crucial marker of viability, and its absence strongly suggests a **missed abortion**. *Absence of fetal pole at 5 weeks* - A fetal pole is typically expected to be visualized between **5.5 and 6 weeks gestation**, so its absence at 5 weeks alone is **not necessarily indicative of a poor prognosis**. - The gestational sac should be present, and a follow-up ultrasound is often recommended to assess for further development. *Absence of cardiac activity at 5 weeks* - **Cardiac activity** is usually first detectable around **6 to 6.5 weeks gestation**, when the crown-rump length (CRL) reaches at least 2 mm. - Therefore, its absence at 5 weeks is a **normal finding** and not indicative of a poor prognosis. *Absence of gestational sac at 4 weeks* - A gestational sac is expected to be visible by **4.5 to 5 weeks of gestation** with transvaginal ultrasound. - Its absence at precisely 4 weeks might be due to **early timing** or inaccurate dating, and a repeat scan is often warranted, rather than assuming a poor prognosis immediately.

Q: If the size of the fetus is 20 mm, according to Hasse’s rule, what is the gestational age of the fetus?

8 weeks. ***8 weeks*** - **Hasse's rule** for early pregnancy (6-12 weeks) states that the **gestational age in weeks = Crown-Rump Length (CRL) in cm + 6.5** - Given a CRL of **20 mm = 2 cm**, applying Hasse's rule: Gestational age = 2 + 6.5 = **8.5 weeks**, which approximates to **8 weeks** - This rule is a classical method for estimating gestational age in the first trimester based on fetal crown-rump length measurements - At 8 weeks, the typical CRL is approximately **15-20 mm**, which aligns with the given measurement *2 weeks* - At **2 weeks gestational age**, the conceptus is still a blastocyst undergoing implantation with **no measurable crown-rump length** (microscopic size) - A CRL of **20 mm** is far too large for this early stage of development - This gestational age precedes the embryonic period when CRL measurements become meaningful *4 weeks* - At **4 weeks gestational age**, the embryo measures approximately **2-3 mm** in crown-rump length - A measurement of **20 mm** is significantly larger, indicating a more advanced gestational age - This would represent nearly 10 times the expected size at 4 weeks *14 weeks* - At **14 weeks gestational age**, the fetus has a crown-rump length of approximately **80-90 mm** (8-9 cm) - A CRL of only **20 mm** is far too small for 14 weeks, representing less than one-quarter of the expected size - This measurement would suggest a much earlier gestational age

Q: Deficiency of which vitamin during pregnancy predisposes to meningomyelocele?

Folic acid. ***Folic acid*** - **Folic acid** (Vitamin B9) is crucial for **neural tube closure** during early embryonic development. - Deficiency leads to neural tube defects such as **meningomyelocele** and **anencephaly**. *Biotin* - **Biotin** (Vitamin B7) plays a role in **metabolism** of carbohydrates, fats, and proteins. - Deficiency is rare and not primarily associated with neural tube defects. *Pyridoxine* - **Pyridoxine** (Vitamin B6) is important for amino acid metabolism and neurotransmitter synthesis but not directly linked to neural tube closure. - Deficiency can lead to **neurological symptoms** and **anemia**. *Thiamine* - **Thiamine** (Vitamin B1) is essential for energy metabolism and nerve function. - Deficiency causes **beriberi** and is not associated with neural tube defects.

Q: In a 34-week pregnancy with low-lying placenta previa and a floating head, with a hemoglobin level of 11 gm%, what should be the further line of management?

Expectant management. ***Expectant management*** - With a 34-week pregnancy, **placenta previa**, and no active bleeding or severe maternal/fetal compromise, **expectant management** is generally preferred to allow for fetal lung maturity. - The hemoglobin level of 11 gm% is within a reasonable range for pregnancy and does not immediately warrant intervention. *Induction of labor* - **Induction of labor** is contraindicated in placenta previa due to the risk of severe hemorrhage as the cervix dilates. - This approach would significantly endanger both the mother and the fetus. *Cesarean section* - While a **cesarean section** is likely the eventual mode of delivery for placenta previa, performing it at 34 weeks without evidence of fetal distress or active bleeding would be premature. - It would increase the risk of neonatal complications associated with prematurity. *Blood transfusion* - A hemoglobin level of **11 gm%** is considered mild anemia in pregnancy and does not typically warrant a **blood transfusion** unless there is active, significant blood loss or symptoms of severe anemia. - Transfusing blood without an immediate need carries its own risks.

Q: Gestational sac can be seen using ultrasonography at the earliest by:

5th week. ***5th week*** - The **gestational sac** is typically the **first sonographic sign of an intrauterine pregnancy**. - It becomes reliably visible via **transvaginal ultrasound** when its mean diameter reaches 2-3 mm, which usually occurs around **5 weeks' gestational age**. *3rd week* - At **3 weeks' gestation**, the embryo is still at a very early stage of development, often a **blastocyst** or undergoing **implantation**. - It is **too small** to be visualized on routine ultrasound, and the gestational sac has not yet sufficiently developed. *4th week* - While implantation is usually complete by the end of the 4th week, the gestational sac is typically **not yet visible** or is **just barely perceptible** as a tiny fluid collection. - Visualization at this stage is often inconsistent and can be challenging, making the 5th week a more reliable earliest detection point. *8th week* - By **8 weeks' gestation**, the gestational sac would be **clearly visible** and much larger, often containing a fetal pole with a visible heartbeat. - This is well past the earliest time it can be detected.

Q: At how many weeks of gestation is the anomaly scan typically performed?

20. ***Correct: 20 weeks*** - The **anomaly scan**, also known as the **mid-pregnancy scan** or **fetal anomaly ultrasound**, is typically performed between **18 and 22 weeks of gestation**, with **20 weeks** being the most common and optimal time. - This timing allows for optimal visualization of fetal anatomy to detect potential **structural abnormalities** while still providing options for further investigation or management, if needed. - At 20 weeks, fetal organs and structures are sufficiently developed and large enough for comprehensive evaluation. *Incorrect: 14 weeks* - A scan at 14 weeks is generally too early for a comprehensive anomaly assessment, as many fetal organs and structures are still developing or too small to be clearly visualized. - This period is more commonly associated with the **nuchal translucency scan** (11-13+6 weeks), which screens for chromosomal abnormalities like Down syndrome. *Incorrect: 16 weeks* - While some gross anomalies might be detectable, 16 weeks is still considered suboptimal for a full and detailed anomaly scan. - Many structures necessary for a thorough evaluation are not fully developed or large enough for reliable assessment. *Incorrect: 18 weeks* - Eighteen weeks falls within the acceptable range for an anomaly scan (18-22 weeks), but **20 weeks** often provides better visualization due to further fetal growth and development. - Some institutions may start anomaly screening from 18 weeks, but 20 weeks is widely considered the ideal time for detailed evaluation of all fetal structures including the heart, brain, spine, kidneys, and limbs.

Q: Fetal heart sounds (FHS) can usually be heard by Pinard's stethoscope at?

18 weeks. ***18 weeks*** - Fetal heart sounds (FHS) can typically be heard with a **Pinard's stethoscope (fetoscope)** between **18 and 20 weeks** of gestation. - This timing allows for sufficient fetal development and sound transmission through the uterine wall for auscultation by this conventional method. - This is an important milestone in routine prenatal care and examination. *14 weeks* - At 14 weeks, fetal heart sounds are generally **not audible** with a Pinard's stethoscope or fetoscope. - A **Doppler ultrasound** is usually required to detect fetal heart activity at this early stage (typically from 10-12 weeks). *22 weeks* - While FHS are audible at 22 weeks, **18 weeks represents the earliest typical timeframe** for detection with a Pinard's stethoscope. - By 22 weeks, FHS would be more readily heard, but this option does not reflect the usual initial detection window. *26 weeks* - FHS are clearly audible at 26 weeks, but this is **later than the typical initial detection** period. - Early detection around 18-20 weeks is important for routine prenatal care and clinical assessment.

Question 1

Ideal time to do Glucose challenge test in pregnancy is?

Accepted Answer

24-28 weeks

Answer

12-16 weeks

Answer

20-24 weeks

Answer

30-34 weeks

Question 2

At what week post fertilization does the embryo transition to being called a fetus?

Accepted Answer

8 weeks

Answer

6 weeks

Answer

10 weeks

Answer

12 weeks

Question 3

Among the following sites, which is the most common location for implantation within the uterine cavity?

Accepted Answer

Fundus of uterus

Answer

Fallopian tube ampullary part

Answer

Fallopian tube isthmus

Answer

Cornu of uterus

Question 4

Which of the following findings on first trimester ultrasound is indicative of a poor prognosis?

Accepted Answer

Absence of cardiac activity at 8 weeks of gestation

Answer

Absence of fetal pole at 5 weeks

Answer

Absence of cardiac activity at 5 weeks

Answer

Absence of gestational sac at 4 weeks

Question 5

If the size of the fetus is 20 mm, according to Hasse’s rule, what is the gestational age of the fetus?

Accepted Answer

8 weeks

Answer

2 weeks

Answer

4 weeks

Answer

14 weeks

Question 6

Deficiency of which vitamin during pregnancy predisposes to meningomyelocele?

Accepted Answer

Folic acid

Answer

Biotin

Answer

Pyridoxine

Answer

Thiamine

Question 7

In a 34-week pregnancy with low-lying placenta previa and a floating head, with a hemoglobin level of 11 gm%, what should be the further line of management?

Accepted Answer

Expectant management

Answer

Cesarean section

Answer

Blood transfusion

Answer

Induction of labor

Question 8

Gestational sac can be seen using ultrasonography at the earliest by:

Accepted Answer

5th week

Answer

3rd week

Answer

4th week

Answer

8th week

Question 9

At how many weeks of gestation is the anomaly scan typically performed?

Accepted Answer

20

Answer

14

Answer

16

Answer

18

Question 10

Fetal heart sounds (FHS) can usually be heard by Pinard's stethoscope at?

Accepted Answer

18 weeks

Answer

14 weeks

Answer

22 weeks

Answer

26 weeks

Prenatal Care — MCQs

Prenatal Care — MCQs

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