Prenatal Care Practice Questions

Q: Anti-D immune globulin is administered to Rh-negative women antenatally at which gestational week?

28 weeks. **Explanation:** The administration of Anti-D immune globulin (RhoGAM) is a critical preventive measure against Rh isoimmunization in Rh-negative, unsensitized mothers. **Why 28 weeks is correct:** The primary goal of antenatal prophylaxis is to neutralize any fetal Rh-positive red blood cells that may enter the maternal circulation. While the risk of fetomaternal hemorrhage (FMH) is low in the first two trimesters, it increases significantly in the third trimester as the placenta thins. Research shows that the incidence of "silent" sensitization peaks after 28 weeks. Administering Anti-D at **28 weeks** provides protective antibody levels that last for approximately 12 weeks, covering the remainder of the pregnancy until delivery. **Analysis of Incorrect Options:** * **A & B (20 & 24 weeks):** At these stages, the risk of spontaneous FMH is negligible. Administering Anti-D this early would result in sub-therapeutic antibody levels by the time the mother reaches full term, leaving her vulnerable during the period of highest risk. * **D (30 weeks):** While closer to the window, waiting until 30 weeks leaves a two-week "gap" (28–30 weeks) where sensitization could occur. International guidelines (ACOG/RCOG) have standardized 28 weeks to maximize the duration of protection. **High-Yield Clinical Pearls for NEET-PG:** 1. **Standard Dose:** 300 mcg (1500 IU) is the standard dose given at 28 weeks; it covers up to 30 ml of fetal whole blood (or 15 ml of fetal RBCs). 2. **Postpartum Dose:** A second dose must be given within **72 hours of delivery** if the neonate is confirmed Rh-positive. 3. **Indirect Coombs Test (ICT):** Anti-D is only given if the mother is **ICT negative** (unsensitized). If ICT is positive, the mother is already sensitized, and Anti-D is of no use. 4. **First Trimester Events:** For abortions or ectopic pregnancies (<13 weeks), a smaller dose of 50 mcg is typically sufficient.

Q: A healthy 20-year-old G1P0 presents for her first OB visit at 10 weeks gestational age. She denies any significant medical history both personally and in her family. Which of the following tests should NOT be ordered as part of the initial prenatal care visit?

One-hour glucose tolerance test. **Explanation:** The initial prenatal visit (booking visit) aims to establish a baseline for maternal health and screen for conditions that could adversely affect the pregnancy. **Why Option C is correct:** The **One-hour Glucose Tolerance Test (GTT)** is a screening tool for Gestational Diabetes Mellitus (GDM). In a low-risk, healthy patient (G1P0, no family history, normal BMI), GDM screening is standardly performed between **24 and 28 weeks** of gestation. This timing is chosen because insulin resistance, driven by placental hormones like Human Placental Lactogen (hPL), peaks during the late second and early third trimesters. Performing it at 10 weeks in a low-risk patient is premature. **Why the other options are incorrect:** * **HIV (Option A):** Universal "opt-out" screening for HIV is mandatory at the first visit to prevent vertical transmission through early antiretroviral therapy. * **Hepatitis B surface antigen (HBsAg) (Option B):** Screening is essential at the first visit to identify neonates who will require the Hep B vaccine and Immunoglobulin (HBIG) at birth. * **Type and Screen (Option D):** Determining blood group and Rh status is critical to identify Rh-negative mothers who require Anti-D prophylaxis to prevent isoimmunization. **Clinical Pearls for NEET-PG:** * **Early GDM Screening:** Only indicated at the first visit if the patient is high-risk (BMI >30, history of GDM, known PCOS, or strong family history of Type 2 DM). * **DIPSI Guidelines:** In India, the Diabetes in Pregnancy Study Group India (DIPSI) recommends a 75g Oral Glucose Tolerance Test (OGTT) at the first visit regardless of risk, but international guidelines (ACOG/RCOG) and standard textbooks (Williams) follow the 24-28 week window for low-risk patients. * **Other Initial Tests:** CBC (for anemia), Syphilis (VDRL/RPR), Rubella immunity, and Urine culture (for asymptomatic bacteriuria).

Q: Which of the following vaccines is NOT contraindicated in pregnancy?

Hepatitis B. **Explanation:** The fundamental principle in prenatal vaccination is the distinction between **Live-Attenuated Vaccines** and **Inactivated/Recombinant Vaccines**. **1. Why Hepatitis B is the Correct Answer:** Hepatitis B is a **subunit (recombinant) vaccine** containing only the HBsAg protein, not the live virus. It is non-infectious and poses no risk to the fetus. It is indicated during pregnancy for women at high risk of infection (e.g., healthcare workers, those with infected partners). Other safe vaccines in pregnancy include Tdap (routinely recommended), Influenza (inactivated), and Rabies. **2. Why the Other Options are Incorrect:** * **Measles (Option A):** This is a live-attenuated vaccine. Live vaccines carry a theoretical risk of viral replication and transmission to the fetus, potentially causing congenital anomalies or fetal infection. * **Varicella (Option B):** This is a live-attenuated vaccine. It is strictly contraindicated; women are advised to avoid pregnancy for at least one month after receiving this vaccine. * **BCG (Option D):** This is a live-attenuated bacterial vaccine (Bacillus Calmette-Guérin). While no harmful effects on the fetus have been proven, it is avoided as a precautionary measure. **NEET-PG High-Yield Pearls:** * **Rule of Thumb:** All **Live Vaccines** (MMR, Varicella, BCG, Yellow Fever, Oral Polio, Oral Typhoid) are **contraindicated**. * **Routine Recommendation:** The **Tdap** vaccine is recommended in every pregnancy (ideally between 27–36 weeks) to provide passive immunity to the neonate against Pertussis. * **Influenza:** The **inactivated** injectable flu shot is safe and recommended in any trimester during flu season. * **Postpartum:** Live vaccines (like MMR) should be administered immediately postpartum if the mother is non-immune.

Q: What is the most accurate method of diagnosing pregnancy at 6 weeks?

Fetal heart sound by USG. **Explanation:** The diagnosis of pregnancy is categorized into presumptive, probable, and positive signs. At 6 weeks of gestation, the most accurate and definitive method is the visualization of **fetal heart activity via Transvaginal Sonography (TVS).** **1. Why Option D is Correct:** Fetal heart sound/activity is a **positive (certain) sign** of pregnancy. Using TVS, a gestational sac is visible at 4.5–5 weeks, a yolk sac at 5 weeks, and fetal cardiac activity can be detected as early as **5.5 to 6 weeks**. Detecting cardiac activity confirms not just pregnancy, but a viable intrauterine pregnancy. **2. Why Other Options are Incorrect:** * **A. Hegar’s Sign:** This is a **probable sign** of pregnancy. it refers to the softening of the uterine isthmus, typically palpable between **6–10 weeks**. While suggestive, it is subjective and not diagnostic. * **B. X-ray examination:** Fetal skeletal shadows only appear on X-ray after **16 weeks** (when mineralization occurs). Furthermore, X-rays are contraindicated in early pregnancy due to the risk of teratogenicity. * **C. Palpation of fetal parts:** This is a positive sign but can only be performed much later, typically after **20 weeks** of gestation. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign of pregnancy on USG:** Gestational sac (at 4.5–5 weeks). * **Discriminatory Zone:** The level of serum β-hCG at which a gestational sac should be visible on USG (TVS: 1,500–2,000 mIU/mL; TAS: 6,500 mIU/mL). * **Fetal Heart Rate (FHR):** Can be heard by **Doppler** at 10–12 weeks and by **Pinard stethoscope** at 18–20 weeks. * **Most accurate method for dating:** Crown-Rump Length (CRL) measured between 7–12 weeks.

Q: What is the primary treatment for red degeneration of a fibroid during pregnancy?

Analgesics. **Explanation:** **Red degeneration (necrobiosis)** is the most common complication of uterine fibroids during pregnancy, typically occurring in the second trimester. It is caused by rapid growth of the fibroid due to high estrogen levels, leading to the tumor outgrowing its blood supply. This results in venous thrombosis, infarction, and hemorrhage within the fibroid. 1. **Why Analgesics are correct:** Red degeneration is a **self-limiting condition**. The primary clinical presentation is acute, severe abdominal pain, localized tenderness, and low-grade fever. The management is strictly **conservative**. Bed rest, hydration, and **analgesics** (specifically NSAIDs like Ibuprofen or Paracetamol) are the mainstays of treatment. Symptoms usually subside within 4–7 days. 2. **Why other options are incorrect:** * **Laparotomy/Myomectomy:** Surgical intervention during pregnancy is contraindicated due to the high risk of uncontrollable hemorrhage and miscarriage. * **Termination of pregnancy:** This is unnecessary as the condition does not pose a direct threat to maternal life and is self-limiting. * **Removal at cesarean section:** Myomectomy during C-section is generally avoided because the uterus is highly vascular, leading to a significant risk of massive hemorrhage. **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Characterized by a "beefy red" appearance and a fishy odor due to the presence of peripheral sulfonamides. * **MRI Finding:** Often shows a characteristic peripheral rim of high signal intensity on T1-weighted images. * **Drug of Choice:** While Paracetamol is first-line, short-term NSAIDs can be used before 32 weeks (avoid late in pregnancy due to risk of premature closure of the ductus arteriosus).

Q: An ultrasound measures a parameter at 3.7 mm. What does this measurement indicate?

A finding higher than normal. ***A finding higher than normal*** - A **nuchal translucency (NT)** measurement of 3.7 mm exceeds the normal threshold of **<3.0-3.5 mm** at 11-13+6 weeks gestation. - This increased NT is associated with **higher risk of chromosomal abnormalities** like **Down syndrome (Trisomy 21)** and **congenital heart defects**. *A normal finding* - Normal **nuchal translucency** should be **less than 3.0-3.5 mm** depending on gestational age and laboratory standards. - A measurement of 3.7 mm clearly exceeds the established **upper limit of normal** for NT screening. *A finding lesser than normal* - **Nuchal translucency** measurements are concerning when they are **increased**, not decreased. - Lower NT values are generally **reassuring** and associated with lower risk of chromosomal abnormalities. *The scan should be repeated at 18 weeks* - **Nuchal translucency** is specifically measured between **11-13+6 weeks** gestation when it is most accurate. - At 18 weeks, NT measurement is **no longer valid** as the nuchal fold naturally resolves by this time.

Q: What is the appropriate management of vulvar varices during pregnancy?

Observation only. **Explanation:** **Vulvar varices** occur in approximately 4–10% of pregnancies, typically due to increased pelvic venous pressure, progesterone-induced vasodilation, and the compressive effect of the gravid uterus on the inferior vena cava. **Why "Observation only" is correct:** The management of vulvar varices during pregnancy is almost exclusively **conservative (observation)**. The key clinical concept is that these varicosities are physiological in nature and **spontaneously regress** within 6–8 weeks postpartum once the mechanical obstruction (the fetus) is removed and hormonal levels normalize. Active surgical or invasive intervention is avoided during pregnancy due to the high risk of bleeding and the likelihood of natural resolution. **Why other options are incorrect:** * **Pressure:** While support garments or "vulvar trusses" can provide symptomatic relief for pain or heaviness, they do not treat the underlying condition. * **Cautery:** This is contraindicated as it carries a high risk of severe hemorrhage from the engorged, thin-walled veins and does not address the proximal venous congestion. * **Simple vulvectomy:** This is a radical surgical procedure reserved for malignancies; it is never indicated for benign gestational varicosities. **NEET-PG High-Yield Pearls:** * **Mode of Delivery:** Vulvar varices are **not** an indication for Cesarean section. Vaginal delivery is safe as these veins are low-pressure and rarely rupture during birth. * **Episiotomy:** If a vaginal delivery is performed, avoid an episiotomy if possible to prevent accidental injury to a varix, which can lead to significant bleeding. * **Symptoms:** Most patients are asymptomatic, but some may report a "heavy" sensation or visible swelling that worsens with prolonged standing.

Question 1

A 36-year-old HIV-positive female is on antiretroviral therapy. Which of the following first-trimester markers of Down syndrome would be affected?

Accepted Answer

Beta-hCG

Answer

PAPP-A

Answer

Nuchal Translucency (NT)

Answer

All of the above

Question 2

Anti-D immune globulin is administered to Rh-negative women antenatally at which gestational week?

Accepted Answer

28 weeks

Answer

20 weeks

Answer

24 weeks

Answer

30 weeks

Question 3

A healthy 20-year-old G1P0 presents for her first OB visit at 10 weeks gestational age. She denies any significant medical history both personally and in her family. Which of the following tests should NOT be ordered as part of the initial prenatal care visit?

Accepted Answer

One-hour glucose tolerance test

Answer

HIV

Answer

Hepatitis B surface antigen

Answer

Type and screen

Question 4

Which of the following is an exception to the guidelines for correct Nuchal translucency measurement?

Accepted Answer

The calipers must be placed parallel to the long axis of the fetus

Answer

Fetus must be in midsagittal plane

Answer

Fetal neck must be in a neutral position

Answer

Amnion must be seen as separate from the NT line

Question 5

A 23-year-old woman at 10 weeks' gestation presents for her initial evaluation. She has a history of asthma exacerbations requiring hospitalization but has never needed intubation or intensive care unit admission. Her asthma is controlled with daily inhaled corticosteroids and albuterol, providing adequate symptom relief. She is concerned about continuing these medications during pregnancy. Which of the following is true regarding asthma medications in pregnancy?

Accepted Answer

Both B2 agonists and inhaled corticosteroids are safe in pregnancy.

Answer

B2 agonists are contraindicated during pregnancy.

Answer

Both agonists and inhaled corticosteroids are contraindicated in pregnancy.

Answer

B2 agonists and inhaled corticosteroids are both safe in pregnancy but during the second and third trimesters only.

Question 6

Which of the following vaccines is NOT contraindicated in pregnancy?

Accepted Answer

Hepatitis B

Answer

Measles

Answer

Varicella

Answer

BCG

Question 7

What is the most accurate method of diagnosing pregnancy at 6 weeks?

Accepted Answer

Fetal heart sound by USG

Answer

Hegar's sign

Answer

X-ray examination

Answer

Palpation of fetal parts

Question 8

What is the primary treatment for red degeneration of a fibroid during pregnancy?

Accepted Answer

Analgesics

Answer

Laparotomy

Answer

Termination of pregnancy

Answer

Removal at cesarean section

Question 9

An ultrasound measures a parameter at 3.7 mm. What does this measurement indicate?

Accepted Answer

A finding higher than normal

Answer

A normal finding

Answer

A finding lesser than normal

Answer

The scan should be repeated at 18 weeks

Question 10

What is the appropriate management of vulvar varices during pregnancy?

Accepted Answer

Observation only

Answer

Pressure

Answer

Cautery

Answer

Simple vulvectomy

Prenatal Care — MCQs

Prenatal Care — MCQs

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