Prenatal Care Practice Questions

Q: Which of the following dietary supplements is recommended for a pregnant patient receiving Heparin therapy?

Calcium. **Explanation:** **Correct Option: B (Calcium)** The primary reason for recommending Calcium supplementation in pregnant patients on long-term Heparin therapy is to mitigate the risk of **Heparin-Induced Osteoporosis**. Heparin increases osteoclast activity and decreases osteoblast function, leading to a reduction in bone mineral density. Since pregnancy itself increases calcium demands for fetal skeletal development, the addition of Heparin significantly elevates the risk of maternal bone loss and vertebral fractures. Therefore, patients on Heparin (either Unfractionated Heparin or LMWH) should receive supplemental Calcium (1000–1500 mg/day) and Vitamin D. **Incorrect Options:** * **A. Folic acid:** While Folic acid is routinely supplemented in all pregnancies to prevent Neural Tube Defects (NTDs), its requirement is not specifically linked to Heparin therapy. * **C & D. Zinc and Copper:** These are trace elements. While they are present in standard prenatal multivitamins, there is no specific clinical indication or increased requirement for them necessitated by Heparin administration. **NEET-PG High-Yield Pearls:** * **Heparin vs. Warfarin:** Heparin is the anticoagulant of choice in pregnancy because it is a large molecule that **does not cross the placenta**, unlike Warfarin, which is teratogenic (causing Fetal Warfarin Syndrome). * **LMWH vs. UFH:** Low Molecular Weight Heparin (LMWH), such as Enoxaparin, is preferred over Unfractionated Heparin (UFH) due to a lower risk of osteoporosis and Heparin-Induced Thrombocytopenia (HIT). * **Monitoring:** UFH is monitored using **aPTT**, whereas LMWH usually does not require monitoring (though **Anti-Xa levels** are used if necessary).

Q: A 35-year-old female with a previous history of a child with Down's syndrome presents with 18 weeks of amenorrhea. What is the investigation of choice to rule out Down's syndrome in the present pregnancy?

Amniocentesis. **Explanation:** The patient is currently at **18 weeks of gestation** and has a high-risk history (previous child with Down’s syndrome). To "rule out" a chromosomal anomaly, a **diagnostic test** (karyotyping) is required rather than a screening test. **1. Why Amniocentesis is the Correct Answer:** Amniocentesis is the gold-standard diagnostic procedure performed between **15–20 weeks** of gestation. Since the patient is at 18 weeks, this is the most appropriate window. It involves aspirating amniotic fluid to obtain fetal desquamated cells for karyotyping, providing a definitive diagnosis of trisomy 21. **2. Why the other options are incorrect:** * **Triple Test (Option A):** This is a **screening test** (measuring AFP, hCG, and uE3). Screening tests only provide a risk probability and cannot "rule out" or confirm the diagnosis. * **Chorionic Villous Biopsy (CVS) (Option D):** While CVS is a diagnostic test, it is ideally performed between **10–13 weeks**. At 18 weeks, the placenta is more formed, and amniocentesis is technically safer and preferred over CVS. * **Cordocentesis (Option C):** Also known as Percutaneous Umbilical Blood Sampling (PUBS), it is usually performed after **18–20 weeks**. However, it carries a higher risk of fetal loss (1–2%) compared to amniocentesis (0.5%) and is generally reserved for rapid karyotyping or fetal blood disorders. **Clinical Pearls for NEET-PG:** * **Best time for Amniocentesis:** 15–20 weeks (Early amniocentesis <14 weeks is avoided due to risk of clubfoot/talipes). * **Most common complication of Amniocentesis:** Premature rupture of membranes (PROM) and fetal loss (0.5%). * **Combined Screening (1st Trimester):** Nuchal translucency (NT) + PAPP-A + hCG (performed at 11–13+6 weeks). * **Quadruple Test:** Triple test + Inhibin A (best screening sensitivity in the 2nd trimester).

Q: Screening for gestational diabetes mellitus (GDM) is not required for which of the following conditions?

Previous pre-eclampsia. **Explanation:** The screening for Gestational Diabetes Mellitus (GDM) is primarily targeted at identifying women with specific risk factors that suggest underlying insulin resistance or metabolic dysfunction. **Why Option D is correct:** While **Pre-eclampsia** is a *complication* of GDM, a history of pre-eclampsia in a previous pregnancy is not a standalone indication for GDM screening in the current pregnancy according to standard guidelines (like DIPSI or IADPSG). Pre-eclampsia is primarily a vascular and endothelial disorder. While it shares some metabolic risk factors with GDM (like obesity), it does not directly imply a high risk of glucose intolerance in the same way that fetal macrosomia or unexplained fetal loss does. **Why the other options are wrong:** * **A. Previous macrosomic infant (>4kg):** This is a classic hallmark of fetal hyperinsulinemia caused by maternal hyperglycemia. It indicates a high risk of recurrent GDM. * **B. Previous congenital malformation:** Poorly controlled pre-gestational or early gestational diabetes is teratogenic (e.g., Sacral agenesis, Cardiac defects). A history of malformation necessitates early screening to rule out undiagnosed Type 2 DM. * **C. Previous stillbirth:** Unexplained third-trimester stillbirth is a known complication of maternal hyperglycemia due to fetal acidemia and hypoxia. **High-Yield Clinical Pearls for NEET-PG:** * **DIPSI Guidelines (India):** Screening is performed at the first prenatal visit and repeated at 24–28 weeks. A single-step test using **75g glucose** is used; a 2-hour plasma glucose **≥140 mg/dL** is diagnostic of GDM, regardless of the fasting state. * **Risk Factors for GDM:** BMI >30 kg/m², Age >35, First-degree relative with DM, PCOS, and history of GDM in a previous pregnancy. * **Most common malformation in GDM:** Ventricular Septal Defect (VSD). * **Most specific malformation in GDM:** Caudal Regression Syndrome (Sacral Agenesis).

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: Cervix undergoes softening in early pregnancy. What is this sign called?

Goodell's sign. **Explanation:** The correct answer is **Goodell’s sign**. During early pregnancy (typically around 6 weeks), increased vascularity and edema of the cervix lead to its softening. In a non-pregnant state, the cervix feels firm like the tip of the nose; however, due to Goodell’s sign, it becomes soft, feeling more like the lips or earlobe. **Analysis of Options:** * **A. Chadwick’s sign:** This refers to the bluish/purplish discoloration of the cervix, vagina, and labia due to pelvic venous congestion. It is also known as Jacquemier’s sign and appears around 6–8 weeks. * **C. Hegar’s sign:** This is the softening of the **isthmus** (the lower uterine segment). On bimanual examination, the upper part of the uterus and the cervix feel like two separate entities because the intervening isthmus is so soft. It is most evident between 6–10 weeks. * **D. Palmer’s sign:** This refers to regular, rhythmic, painless uterine contractions that can be felt during a bimanual examination as early as 4–8 weeks of gestation. **High-Yield Clinical Pearls for NEET-PG:** * **Osiander’s sign:** Increased pulsation felt through the lateral vaginal fornices due to increased vascularity (at 8 weeks). * **Piskacek’s sign:** Asymmetrical enlargement of the uterus if implantation occurs near one of the cornua. * **Ladins sign:** Softening of the anterior midline of the uterus at the junction of the cervix and body (at 6 weeks). * **Rule of Thumb:** If the question mentions **Cervical Softening**, think **Goodell’s**; if it mentions **Cervical Color**, think **Chadwick’s**.

Q: Which investigation is contraindicated in an antenatal expectant mother?

X-rays. **Explanation:** The correct answer is **A. X-rays**. **1. Why X-rays are contraindicated:** X-rays utilize **ionizing radiation**, which is potentially teratogenic and mutagenic to the developing fetus. The risks are highest during the period of organogenesis (2–8 weeks post-conception) and early fetal development. Exposure can lead to congenital malformations, microcephaly, growth restriction, and an increased lifetime risk of childhood leukemia. While a single diagnostic X-ray (like a chest X-ray with abdominal shielding) often falls below the threshold of 5 rad (50 mGy) associated with adverse effects, they are generally avoided unless the maternal benefit significantly outweighs the fetal risk. **2. Why other options are incorrect:** * **B. Ultrasound:** This is the gold standard for fetal monitoring. It uses non-ionizing sound waves and has no documented thermal or mechanical risks to the fetus, making it completely safe. * **C. Urine examination:** Essential for screening for asymptomatic bacteriuria, proteinuria (preeclampsia), and glycosuria. It is a non-invasive, safe procedure. * **D. Blood examination:** Routine blood tests (CBC, blood grouping, serology for HIV/Hepatitis) are mandatory components of antenatal care to ensure maternal and fetal well-being. **High-Yield Clinical Pearls for NEET-PG:** * **Threshold Dose:** Fetal risk is considered negligible at exposures **<5 rad (50 mGy)**. Most diagnostic X-rays are <1 rad. * **Most Sensitive Period:** The fetus is most sensitive to CNS effects (intellectual disability) between **8–15 weeks** of gestation. * **Safe Imaging:** Ultrasound and MRI (without Gadolinium) are the preferred imaging modalities in pregnancy. * **Rule of Thumb:** Always perform a pregnancy test in women of reproductive age before elective radiological procedures (The "10-day rule").

Question 1

Which of the following dietary supplements is recommended for a pregnant patient receiving Heparin therapy?

Accepted Answer

Calcium

Answer

Folic acid

Answer

Zinc

Answer

Copper

Question 2

A 35-year-old female with a previous history of a child with Down's syndrome presents with 18 weeks of amenorrhea. What is the investigation of choice to rule out Down's syndrome in the present pregnancy?

Accepted Answer

Amniocentesis

Answer

Triple test

Answer

Cordocentesis

Answer

Chorionic villous biopsy

Question 3

Screening for gestational diabetes mellitus (GDM) is not required for which of the following conditions?

Accepted Answer

Previous pre-eclampsia

Answer

Previous delivery of a macrosomic infant

Answer

Previous delivery with congenital malformation

Answer

Previous stillbirth

Question 4

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 5

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 6

Cervix undergoes softening in early pregnancy. What is this sign called?

Accepted Answer

Goodell's sign

Answer

Chadwick's sign

Answer

Hegar's sign

Answer

Palmer's sign

Question 7

Increased nuchal translucency at 14 weeks gestation is seen in which of the following conditions?

Accepted Answer

Down's syndrome

Answer

Turner's syndrome

Answer

Hydrocephalus

Answer

Skeletal dysplasia

Question 8

Which investigation is contraindicated in an antenatal expectant mother?

Accepted Answer

X-rays

Answer

Ultrasound

Answer

Urine examination

Answer

Blood examination

Question 9

An antenatal ultrasound performed at 18-20 weeks of gestation is primarily intended to detect which of the following?

Accepted Answer

Fetal anomalies

Answer

Sex of the fetus

Answer

Maturity of the fetus

Answer

Quantity of amniotic fluid

Question 10

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.

Prenatal Care — MCQs

Prenatal Care — MCQs

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