Prenatal Care Practice Questions

Q: What is the approximate fetal weight if the height of the uterus above the pubic symphysis is 35 cm and the station of the head is -2?

3.5 kg. The correct answer is **3.5 kg**. ### **Explanation of the Correct Answer** The fetal weight is calculated using **Johnson’s Formula**, a clinical method to estimate fetal weight based on the fundal height and the station of the presenting part. **The Formula:** $\text{Fetal Weight (in grams)} = (H - n) \times 155$ Where: * **H** = Symphysio-fundal height (SFH) in cm. * **n** = 12 if the presenting part is at or above station 0. * **n** = 11 if the presenting part is below station 0 (engaged). **Calculation for this question:** * $H = 35 \text{ cm}$ * $n = 12$ (since the station is -2, which is above station 0) * $\text{Weight} = (35 - 12) \times 155$ * $\text{Weight} = 23 \times 155 = 3,565 \text{ grams} \approx \mathbf{3.5 \text{ kg}}$ ### **Why Other Options are Incorrect** * **Option A (2.5 kg):** This would correspond to an SFH of approximately 28 cm at station -2. * **Option B (3 kg):** This would correspond to an SFH of approximately 31-32 cm at station -2. * **Option D (4 kg):** This would require an SFH of approximately 38 cm at station -2. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Rule of Thumb:** After 24 weeks of gestation, the SFH in centimeters roughly matches the gestational age in weeks (e.g., 30 cm $\approx$ 30 weeks). 2. **Haase’s Rule:** Used to determine fetal length. For the first 5 months, length = $\text{month}^2$. For the last 5 months, length = $\text{month} \times 5$. 3. **Limitations:** Johnson’s formula is less accurate in cases of maternal obesity, polyhydramnios, or multiple pregnancies. 4. **Station 0:** This refers to the level of the **ischial spines**. Any station with a negative value (-1 to -5) indicates the head is not yet engaged.

Q: What is the minimum height for a primigravida woman to be considered for intervention regarding fetal growth?

140 cm. **Explanation:** In obstetrics, maternal height is a critical screening tool used to predict the risk of **Cephalopelvic Disproportion (CPD)**. A short stature is often associated with a small or contracted pelvis, which can lead to obstructed labor, especially in a primigravida where the pelvis has not been "proven" by a previous delivery. 1. **Why 140 cm is correct:** According to standard obstetric guidelines (including WHO and Park’s Preventive and Social Medicine), a height of **less than 140–145 cm** is considered a high-risk factor. Specifically, for NEET-PG purposes, **140 cm** is the established threshold below which a primigravida is categorized as "short-statured," necessitating close monitoring for fetal growth and pelvic adequacy to prevent complications like obstructed labor. 2. **Why other options are incorrect:** * **145 cm:** While some guidelines use 145 cm as a cautionary cutoff, 140 cm is the more definitive "minimum" threshold used in most standardized Indian medical examinations to trigger intervention or high-risk classification. * **150 cm:** This is considered a normal height; women of this height generally have a lower risk of contracted pelvis. * **135 cm:** While a woman of this height is certainly at risk, the screening threshold starts higher (at 140 cm) to ensure early identification of at-risk mothers. **High-Yield Clinical Pearls for NEET-PG:** * **Contracted Pelvis:** Defined when any of the essential diameters of the pelvis is reduced by 0.5 cm or more. * **CPD Assessment:** The best clinical method to assess CPD is **Muller-Munro Kerr’s method** (bimanual examination). * **Complications of Short Stature:** Increased risk of non-engagement of the fetal head, malpresentations (e.g., transverse lie), and prolonged labor. * **Management:** Short-statured primigravidae should ideally deliver in a tertiary care center where facilities for an emergency Cesarean section are available.

Q: After an initial serum $\beta$-hCG test in a patient with suspected pregnancy, when should the repeat $\beta$-hCG level ideally be checked to assess viability or progression?

48 hours. ***Correct: 48 hours*** - In a viable, intrauterine pregnancy, serum β-hCG levels typically **double approximately every 48 hours** (or show a rise of at least 35% in 48 hours) during the initial weeks. - This standard **48-hour interval** is critical as it provides the most timely and appropriate benchmark to determine if the required doubling is occurring, aiding in the assessment of viability. - This is the **gold standard timing** for repeat β-hCG testing in early pregnancy monitoring. *Incorrect: 24 hours* - This interval is generally **too short** to observe the significant rise needed to confidently distinguish a normal, viable doubling rate from an abnormal or insufficient rate. - Due to natural variations in hormone secretion, a 24-hour reading often yields an overlapping range, making interpretation of the trend difficult. *Incorrect: 72 hours* - Although a check at 72 hours is sometimes used (as doubling can take up to 72 hours), waiting this long can **delay critical diagnosis** of urgent conditions like a non-ruptured **ectopic pregnancy** or ongoing miscarriage. - The 48-hour check remains the standard benchmark providing the earliest necessary data for management decisions. *Incorrect: 96 hours* - Waiting 96 hours (4 days) is generally **too long** and could significantly delay necessary intervention or further management for a non-viable or **ectopic pregnancy**. - While β-hCG doubling slows down significantly after approximately 6 weeks of gestation, the initial assessment requires the tighter 48-hour timeframe.

Q: A 24-year-old primigravida presents with painful vaginal bleeding in the first trimester. On USG, a well-formed gestation ring with central echoes from the embryo indicates a healthy fetus, and there is observation of fetal cardiac motion. What is the most probable diagnosis?

Threatened abortion. ***Threatened abortion***- This diagnosis applies when there is **vaginal bleeding** (often painful) in the first 20 weeks of pregnancy, but the **cervix is closed** and **fetal viability** (confirmed by fetal cardiac motion) is observed on ultrasound.- It is the most common cause of bleeding in early pregnancy and signifies that while the pregnancy is at risk, it is still continuing with a live fetus.*Inevitable abortion*- This diagnosis is characterized by vaginal bleeding accompanied by cervical changes, specifically **cervical dilation**, making continuation of the pregnancy unlikely.- Viable fetal cardiac activity rules out inevitable or ongoing abortion processes.*Incomplete abortion*- This involves the partial expulsion of the products of conception; USG would show **retained placental tissue** or fetal tissue and the loss of fetal viability.- The existence of **fetal cardiac motion** and a complete gestation ring confirms the pregnancy is still intact and rules out incomplete expulsion.*Complete abortion*- In this scenario, all products of conception have been expelled, resulting in an **empty uterine cavity** on ultrasound.- The presence of a **well-formed gestation ring** and an actively moving embryo/fetus clearly excludes complete abortion.

Q: Identify the sign.

Hegar's sign. ***Hegar's sign*** - This sign is demonstrated during a **bimanual pelvic examination** where the lower uterine segment (isthmus) feels extremely soft and compressible, almost as if the cervix and the body of the uterus are separate structures. - It is a **probable sign of pregnancy**, typically appearing between 6 to 12 weeks of gestation, caused by hormonal changes leading to increased vascularity and softening of the uterine isthmus. *Chadwick's sign* - This is a visual finding, not a palpable one, characterized by a **bluish or purplish discoloration** of the cervix, vagina, and vulva. - It is an early, **presumptive sign** of pregnancy caused by increased blood flow (**venous congestion**) to the area, usually visible from about 6-8 weeks of gestation. *Goodell's sign* - This refers to the marked **softening of the cervix** itself, which changes from a consistency similar to the tip of the nose to that of lips. - While it is a probable sign of pregnancy also appearing around 6-8 weeks, it is distinct from Hegar's sign, which involves the softening of the **uterine isthmus** above the cervix. *Piskacek's sign* - This is the palpable **asymmetric enlargement** and softening of the uterus, where the area of implantation feels like a bulge or tumor. - It occurs when the embryo implants near one of the uterine cornua, leading to an uneven shape of the uterus, and is not what is depicted in the image.

Q: Which of the following CVS changes are not seen in pregnancy?

Diastolic murmur. ***Diastolic murmur***- Diastolic murmurs are generally **pathologic** and are *not* considered normal physiological findings resulting from the changes of pregnancy.- Their presence often indicates significant underlying structural heart disease, such as **mitral stenosis** or **aortic regurgitation**, requiring comprehensive cardiac evaluation.*Soft Systolic murmur*- A low-grade, transient, **ejection systolic murmur** is very common (up to 90% of cases) due to the **hyperdynamic circulatory state**.- This flow murmur results from increased **cardiac output** and elevated stroke volume across normal valves.*S3*- A pronounceable **third heart sound (S3)** is frequently heard due to the large increase in circulating plasma volume leading to **volume overload**.- This sound is caused by the **rapid filling** of the ventricle during early diastole, a common finding in high-output states.*Loud S1 splitting*- The first heart sound (**S1**) often becomes noticeably **louder** during pregnancy due to the **hyperdynamic circulation** and elevated heart rate.- The increased heart rate and fluid volume can enhance the audibility and sometimes the perception of splitting due to the closure of the **mitral and tricuspid valves**.

Q: What is the earliest sign of pregnancy on TVS?

G sac. ***G sac***- The **gestational sac** (G sac) is the first definitive sonographic sign of an intrauterine pregnancy (IUP) visible on TVS, typically appearing between **4.5 to 5 weeks** of gestation. - It is seen as a small, **anechoic** (fluid-filled) structure surrounded by a highly **echogenic rim** (trophoblastic tissue), often demonstrating the **double decidual sign**. *Yolk sac* - The **yolk sac** is visualized *after* the gestational sac, typically around **5 to 5.5 weeks** of gestation, located eccentrically within the gestational sac. - Its presence is crucial but is not the earliest structure seen on TVS. *Cardiac activity* - **Fetal cardiac activity** is usually first detectable by TVS comparatively later, generally around **6 to 6.5 weeks** of gestation. - The detection of cardiac activity requires the presence of a viable **fetal pole** (embryo). *Fetal pole* - The **fetal pole** (representing the early embryo) is generally first visualized by TVS around **5.5 to 6 weeks** of gestation. - While a very early finding, it appears slightly *after* the initial visualization of the **gestational sac** itself.

Q: The image depicts which of the following early signs of pregnancy?

Hegar sign. ***Hegar Sign*** - The image demonstrates a bimanual examination where the lower uterine segment (isthmus) is compressed between the internal and external fingers, which is the classic maneuver to elicit **Hegar sign**. - This is a probable sign of pregnancy, characterized by the softening and compressibility of the uterine isthmus, typically detectable between **6 to 8 weeks** of gestation. *Goodell Sign* - **Goodell sign** refers to the significant softening of the **cervix** due to increased vascularity and edema, which feels like the consistency of lips rather than the tip of the nose. - The examination shown in the image is focused on palpating the **uterine isthmus**, which is located superior to the cervix. *Osiander sign* - **Osiander sign** is the detection of an increased **pulsation** in the **lateral vaginal fornices**, which is a result of increased blood flow through the uterine artery. - The image depicts the assessment of tissue consistency and compressibility, not the detection of arterial pulsations. *Palmer sign* - **Palmer sign** is characterized by regular, rhythmic **uterine contractions** that can be palpated during a bimanual examination in early pregnancy. - The maneuver shown is assessing the static compressibility of the uterine isthmus, not its dynamic contractile activity.

Q: Which sign of pregnancy is demonstrated in the image below?

Hegar Sign. ***Hegar Sign*** - This sign refers to the **softening and compressibility** of the lower uterine segment, which can be appreciated during a bimanual examination, as depicted in the image. - It is a probable sign of pregnancy and typically appears between **6 to 8 weeks of gestation** due to hormonal influences. *Goodell Sign* - This is the **softening of the vaginal portion of the cervix**, which feels like lips rather than the tip of the nose (as it feels in a non-pregnant state). - The image demonstrates palpation of the uterine isthmus between the abdominal and vaginal hands, not just the cervix. *Osiander sign* - This refers to an increased **arterial pulsation** felt through the lateral fornices of the vagina due to increased blood flow through the uterine artery. - The examination shown is a midline palpation to assess the uterus, not the lateral fornices to detect pulsations. *Palmer sign* - This is characterized by **rhythmic uterine contractions** that can be felt on bimanual examination during early pregnancy. - The image illustrates assessing the consistency (softness) of the lower uterus, not feeling for contractions.

Question 1

What is the approximate fetal weight if the height of the uterus above the pubic symphysis is 35 cm and the station of the head is -2?

Accepted Answer

3.5 kg

Answer

2.5 kg

Answer

3 kg

Answer

4 kg

Question 2

What is uterine souffle?

Accepted Answer

Caused by an increase in blood flow through the dilated uterine vessels.

Answer

A soft blowing murmur synchronous with foetal heart sounds.

Answer

Caused by active foetal movements.

Answer

Indicates underlying foetal distress.

Question 3

What is the minimum height for a primigravida woman to be considered for intervention regarding fetal growth?

Accepted Answer

140 cm

Answer

145 cm

Answer

150 cm

Answer

135 cm

Question 4

After an initial serum $\beta$-hCG test in a patient with suspected pregnancy, when should the repeat $\beta$-hCG level ideally be checked to assess viability or progression?

Accepted Answer

48 hours

Answer

96 hours

Answer

24 hours

Answer

72 hours

Question 5

A 24-year-old primigravida presents with painful vaginal bleeding in the first trimester. On USG, a well-formed gestation ring with central echoes from the embryo indicates a healthy fetus, and there is observation of fetal cardiac motion. What is the most probable diagnosis?

Accepted Answer

Threatened abortion

Answer

Inevitable abortion

Answer

Complete abortion

Answer

Incomplete abortion

Question 6

Identify the sign.

Accepted Answer

Hegar's sign

Answer

Goodell's sign

Answer

Piskacek's sign

Answer

Chadwick's sign

Question 7

Which of the following CVS changes are not seen in pregnancy?

Accepted Answer

Diastolic murmur

Answer

S3

Answer

Loud S1 splitting

Answer

Soft Systolic murmur

Question 8

What is the earliest sign of pregnancy on TVS?

Accepted Answer

G sac

Answer

Fetal pole

Answer

Cardiac activity

Answer

Yolk sac

Question 9

The image depicts which of the following early signs of pregnancy?

Accepted Answer

Hegar sign

Answer

Osiander sign

Answer

Palmer sign

Answer

Goodell sign

Question 10

Which sign of pregnancy is demonstrated in the image below?

Accepted Answer

Hegar Sign

Answer

Goodell Sign

Answer

Palmer sign

Answer

Osiander sign

Prenatal Care — MCQs

Prenatal Care — MCQs

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