Prenatal Care — MCQs

Prenatal Care Indian Medical PG Practice Questions and MCQs

Question 381: Fetal cardiac pulsation can be detected earliest by ultrasonography at what gestational age?

A. 12 weeks
B. 5 weeks
C. 7 weeks (Correct Answer)
D. 9 weeks

Explanation: **Explanation:** The detection of fetal cardiac activity is a critical milestone in early pregnancy, confirming fetal viability. **1. Why 7 weeks is correct:** While the primitive heart tube begins beating at approximately 22 days (around 5 weeks) of gestation, it is generally detectable via **Transabdominal Sonography (TAS)** starting from **7 weeks**. In the context of standard clinical practice and competitive exams like NEET-PG, 7 weeks is the established benchmark for reliable detection using the transabdominal approach. **2. Analysis of Incorrect Options:** * **5 weeks (Option B):** At this stage, only the gestational sac and sometimes the yolk sac are visible. While the heart starts beating microscopically, it is too small to be resolved by standard ultrasound. However, **Transvaginal Sonography (TVS)** can often detect a flicker as early as **5.5 to 6 weeks**. * **9 weeks (Option D):** By this time, the fetus is well-developed with visible limb buds. Waiting until 9 weeks would be a delayed finding, as cardiac activity must be present once the Crown-Rump Length (CRL) reaches 7mm. * **12 weeks (Option A):** This corresponds to the end of the first trimester. At this stage, fetal heart tones are typically audible using a **Handheld Doppler**, but they are visible on ultrasound much earlier. **Clinical Pearls for NEET-PG:** * **TVS vs. TAS:** TVS is more sensitive and can detect cardiac activity **1 week earlier** (approx. 6 weeks) than TAS (approx. 7 weeks). * **Discriminatory Sign:** If the CRL is **>7 mm** and no cardiac activity is seen on TVS, it is diagnostic of a non-viable pregnancy (missed abortion). * **Order of appearance on USG:** Gestational sac (5 weeks) → Yolk sac (5.5 weeks) → Fetal pole with cardiac activity (6 weeks TVS / 7 weeks TAS).

Question 382: What is the recommended daily intake of folic acid for a pregnant woman with a history of neural tube defects (NTD) during the first trimester?

A. 100 micrograms
B. 400 micrograms
C. 4 mg (Correct Answer)
D. 5 mg

Explanation: **Explanation:** The prevention of Neural Tube Defects (NTDs) through folic acid supplementation is a high-yield topic in NEET-PG. The dosage is strictly categorized based on the patient's risk profile. **1. Why 4 mg is correct:** For women at **high risk**—specifically those with a **previous history of a child with an NTD**—the recommended dose is **4 mg (4000 micrograms)** daily. This high-dose supplementation should ideally begin at least 1–3 months prior to conception and continue through the first 12 weeks of pregnancy. This regimen reduces the risk of recurrence by approximately 70%. **2. Analysis of Incorrect Options:** * **A (100 mcg):** This is insufficient for any pregnancy category. * **B (400 mcg / 0.4 mg):** This is the standard dose for **low-risk** women (general population) to prevent the first occurrence (primary prevention) of NTDs. * **D (5 mg):** While 5 mg is often the commercially available tablet size used to achieve the 4 mg requirement in many clinical settings, the **standard WHO/ACOG guideline** specifically cites **4 mg** as the target dose for secondary prevention. **Clinical Pearls for NEET-PG:** * **Timing:** Folic acid must be started **pre-conceptionally** because the neural tube closes by day 28 of gestation, often before a woman knows she is pregnant. * **Other High-Risk Groups:** Women with diabetes mellitus, those taking anti-epileptic drugs (e.g., Valproate, Carbamazepine), or those with malabsorption (Celiac disease) also require higher doses (typically 4-5 mg). * **Mechanism:** Folic acid is essential for DNA synthesis and methylation; deficiency leads to failure of the neural folds to fuse.

Question 383: A primigravida with abnormal sonographic findings has decreased alpha fetoprotein (AFP) levels. What condition may the fetus have?

A. Anencephaly
B. Anterior abdominal wall defects
C. Renal anomalies
D. Down's syndrome (Correct Answer)

Explanation: **Explanation:** The correct answer is **Down’s Syndrome (Trisomy 21)**. Maternal Serum Alpha-Fetoprotein (MSAFP) is a glycoprotein produced initially by the yolk sac and later by the fetal liver. In pregnancies affected by Down’s syndrome, MSAFP levels are characteristically **decreased** (typically <0.5 MoM). While the exact pathophysiology is not fully understood, it is attributed to reduced synthesis by the fetal liver or a smaller-than-normal yolk sac in the first trimester. **Analysis of Options:** * **Down’s Syndrome (Correct):** Associated with decreased MSAFP, decreased Estriol (uE3), increased hCG, and increased Inhibin-A (the "Quadruple Screen" pattern). * **Anencephaly & Anterior Abdominal Wall Defects (Incorrect):** Conditions like neural tube defects (NTDs) and gastroschisis/omphalocele lead to **increased** MSAFP because the protein leaks directly from the fetal circulation into the amniotic fluid through the exposed defect. * **Renal Anomalies (Incorrect):** Congenital nephrosis (Finnish type) is a classic cause of significantly **elevated** MSAFP due to massive proteinuria into the amniotic fluid. **High-Yield Clinical Pearls for NEET-PG:** * **Causes of Low MSAFP:** Down’s syndrome, Trisomy 18 (Edwards syndrome), Gestational Trophoblastic Disease (GTD), and overestimation of gestational age. * **Causes of High MSAFP:** Open Neural Tube Defects (Anencephaly, Spina Bifida), Abdominal wall defects, Multiple gestations, Renal anomalies, and underestimation of gestational age (most common cause). * **Rule of Thumb:** If the "skin" is not intact (NTDs, Gastroschisis), AFP goes **UP**. If there is a chromosomal trisomy, AFP usually goes **DOWN**.

Question 384: How should a woman who had 4 pregnancies at term delivered, one of which is twin pregnancy, be designated?

A. Gravida 4 Para 5
B. Gravida 4 Para 4 (Correct Answer)
C. Gravida 5 Para 4
D. Gravida 5 Para 5

Explanation: ### Explanation The correct designation is **Gravida 4 Para 4**. This question tests the fundamental understanding of obstetric terminology, specifically the distinction between how pregnancies and births are counted. **1. Why Option B is Correct:** * **Gravida (G):** Refers to the total number of times a woman has been pregnant, regardless of the outcome or the number of fetuses. Since this woman had 4 pregnancies, she is **G4**. * **Para (P):** Refers to the number of pregnancies that have reached the age of viability (usually 20–24 weeks). Crucially, **multiple gestations (twins, triplets) count as a single parous event.** Even though she delivered five children, she had 4 delivery events that reached term. Therefore, she is **P4**. **2. Why the Other Options are Incorrect:** * **Option A (G4 P5):** Incorrectly counts the twin delivery as two parous events. Parity refers to the *pregnancy event*, not the number of infants born. * **Option C (G5 P4):** Incorrectly assumes the twin pregnancy counts as two pregnancies. A twin pregnancy is a single obstetric event. * **Option D (G5 P5):** Incorrectly counts both pregnancies and births based on the number of fetuses rather than the number of gestations. **3. NEET-PG High-Yield Clinical Pearls:** * **The "Event" Rule:** Always remember: **Gravida = Pregnancies; Para = Birth Events.** Twins = G1 P1. * **GTPAL System:** For more detailed coding: * **G** (Gravida): Total pregnancies. * **T** (Term): Deliveries >37 weeks. * **P** (Preterm): Deliveries 20–37 weeks. * **A** (Abortion): Loss <20 weeks. * **L** (Living): Number of living children (This is the *only* section where twins count as two). * **Nulligravida:** Never been pregnant. * **Primigravida:** Pregnant for the first time. * **Multipara:** Has completed two or more pregnancies to viability.

Question 385: A pregnant patient with G2P1L1 and twin gestation has a BMI of 26. What is the ideal weight gain recommended during pregnancy?

A. 37-54 lb
B. 31-50 lb (Correct Answer)
C. 25-42 lb
D. None of the above

Explanation: The recommended weight gain during pregnancy is based on the pre-pregnancy Body Mass Index (BMI) and the number of fetuses. This question tests the specific guidelines for **twin gestations** as established by the Institute of Medicine (IOM). ### **Explanation of the Correct Answer** The patient has a BMI of 26, which classifies her as **Overweight** (BMI 25.0–29.9). According to IOM guidelines for twin pregnancies: * **Normal BMI (18.5–24.9):** 37–54 lb (16.8–24.5 kg) * **Overweight BMI (25.0–29.9):** **31–50 lb (14.1–22.7 kg)** * **Obese BMI (≥30):** 25–42 lb (11.3–19.1 kg) Since the patient falls into the overweight category, the ideal weight gain is **31–50 lb**. ### **Analysis of Incorrect Options** * **Option A (37-54 lb):** This is the recommended range for a woman with a **Normal pre-pregnancy BMI** carrying twins. * **Option C (25-42 lb):** This is the recommended range for an **Obese woman** (BMI ≥30) carrying twins. ### **NEET-PG High-Yield Pearls** 1. **Singleton Pregnancy Guidelines:** For a normal BMI (18.5–24.9), the recommended gain is **25–35 lb (11.5–16 kg)**. 2. **Underweight Patients:** Women with a BMI <18.5 should gain the most weight (28–40 lb for singletons; no specific IOM range for twins, but generally encouraged to exceed normal ranges). 3. **Weight Distribution:** In a singleton pregnancy, the fetus accounts for only about 25% of the total weight gain; the rest is due to the placenta, amniotic fluid, uterine hypertrophy, and increased blood volume. 4. **Clinical Significance:** Inadequate weight gain increases the risk of IUGR and preterm birth, while excessive gain increases the risk of gestational diabetes, preeclampsia, and macrosomia.

Question 386: Karyotyping of foetus may be done from all of the following EXCEPT:

A. Lymphocyte
B. Monocyte (Correct Answer)
C. Amniocyte
D. Fibroblast

Explanation: To perform karyotyping, cells must be capable of undergoing **mitosis** (cell division) in a laboratory culture. This allows the chromosomes to be arrested in **metaphase**, where they are most condensed and visible. ### **Explanation of the Correct Answer** * **B. Monocyte:** Monocytes are terminally differentiated cells in the peripheral blood. Unlike lymphocytes, they do not readily undergo mitotic division in standard culture media used for karyotyping. Therefore, they are not a viable source for chromosomal analysis. ### **Explanation of Incorrect Options** * **A. Lymphocyte:** This is the most common source for postnatal karyotyping. T-lymphocytes are stimulated to divide using a mitogen (like Phytohemagglutinin), making them ideal for analysis. * **C. Amniocyte:** These are fetal cells shed into the amniotic fluid. They are routinely cultured during **Amniocentesis** (performed at 15–20 weeks) for prenatal genetic diagnosis. * **D. Fibroblast:** These cells are obtained via skin biopsy or from the stroma of **Chorionic Villus Sampling (CVS)**. They grow well in culture and are frequently used for long-term genetic studies or when blood samples are unavailable. ### **High-Yield Clinical Pearls for NEET-PG** * **Standard Arresting Agent:** **Colchicine** (or Colcemid) is used to arrest cells in metaphase by inhibiting spindle formation. * **Timing of Prenatal Tests:** * CVS: 10–13 weeks (earliest diagnostic test). * Amniocentesis: 15–20 weeks. * Cordocentesis (Percutaneous Umbilical Blood Sampling): After 18 weeks; provides the fastest results (48–72 hours) because fetal lymphocytes are used. * **Most Common Stain:** **Giemsa stain (G-banding)** is the gold standard for identifying chromosomal bands.

Question 387: What are the daily iron requirements in milligrams for pregnant and non-pregnant women, respectively?

A. 40-50mg; 20-25mg (Correct Answer)
B. 20-25mg; 15-20mg
C. 15-20mg; 40-50mg
D. 10-15mg; 15-20mg

Explanation: **Explanation:** The correct answer is **A (40-50mg; 20-25mg)**. This reflects the physiological increase in iron demand during pregnancy to support fetal growth, placental development, and the significant expansion of maternal red cell mass. **1. Why Option A is Correct:** * **Non-pregnant women:** Require approximately **18–20 mg/day** (often rounded to 20-25 mg in clinical guidelines) to compensate for menstrual blood loss. * **Pregnant women:** The total iron requirement during pregnancy is approximately **1000 mg**. To maintain positive iron balance and prevent maternal anemia, the daily intake must increase to **40–60 mg**. The Indian Council of Medical Research (ICMR) and the Ministry of Health and Family Welfare (MoHFW) recommend 60 mg of elemental iron daily for all pregnant women starting from the second trimester. **2. Why Other Options are Incorrect:** * **Option B:** 20-25mg is the requirement for non-pregnant women, not pregnant ones. This dose would lead to iron deficiency anemia in pregnancy. * **Option C:** Reverses the values; pregnancy always requires higher supplementation than the non-pregnant state. * **Option D:** These values are too low to meet the physiological demands of menstruation or the hemodilution (physiological anemia) seen in pregnancy. **High-Yield Clinical Pearls for NEET-PG:** * **Prophylaxis (Anemia Mukt Bharat):** 60 mg elemental iron + 500 mcg Folic acid daily for 180 days starting from 14 weeks of gestation. * **Therapeutic Dose:** If a pregnant woman is diagnosed with anemia (Hb <11 g/dL), the dose is doubled (120 mg elemental iron daily). * **Iron Absorption:** Best absorbed on an empty stomach with Vitamin C (citrus juice). Avoid tea, coffee, or calcium supplements within 2 hours of intake as they inhibit absorption. * **Elemental Iron Content:** Ferrous Fumarate (33%), Ferrous Sulfate (20%), Ferrous Gluconate (12%).

Question 388: What does the term "placental sign" denote?

A. Alteration of Fetal Heart Rate on pressing the head into the pelvis
B. Spotting on the expected date of period in early months of pregnancy (Correct Answer)
C. Permanent lengthening of the cord in the 3rd stage of labour
D. Slight gush of bleeding in third stage of labour

Explanation: ### Explanation **Correct Option: B (Spotting on the expected date of period in early months of pregnancy)** The **Placental Sign** (also known as **Hartman’s Sign**) refers to slight vaginal bleeding or spotting that occurs around the time of the first or second missed menstrual period. * **Mechanism:** This occurs due to the erosion of maternal blood vessels (decidua capsularis) during the process of implantation and the rapid expansion of the trophoblast. As the blastocyst embeds itself into the vascular endometrium, physiological bleeding may occur, which the patient often mistakes for a light period. This is a common cause of "false menstruation" in early pregnancy. **Analysis of Incorrect Options:** * **Option A:** This describes a clinical maneuver related to assessing fetal head engagement or fetal distress (e.g., **Müller-Munro Kerr maneuver**), but it is not termed the placental sign. * **Option C:** Permanent lengthening of the umbilical cord is a classic sign of **placental separation** during the third stage of labor. * **Option D:** A slight gush of blood is also a sign of **placental separation** (Schultze mechanism) during the third stage of labor, indicating that the placenta has detached from the uterine wall. **High-Yield Clinical Pearls for NEET-PG:** * **Hartman’s Sign:** Another name for the placental sign; it is physiological and usually self-limiting. * **Implantation Window:** Occurs roughly 6–10 days after ovulation. * **Third Stage Signs:** Do not confuse "Placental Sign" with "Signs of Placental Separation" (e.g., Calkin’s sign, lengthening of the cord, and gush of blood). * **Differential Diagnosis:** In early pregnancy, spotting should always be differentiated from pathological causes like threatened abortion or ectopic pregnancy.

Question 389: Which drug should be avoided in the first trimester of pregnancy?

A. Azithromycin
B. Warfarin (Correct Answer)
C. Propylthiouracil
D. Labetalol

Explanation: **Explanation:** **Warfarin (Option B)** is the correct answer because it is a known potent teratogen. It crosses the placenta and, when administered during the first trimester (specifically between 6–9 weeks of gestation), can cause **Fetal Warfarin Syndrome**. This syndrome is characterized by nasal hypoplasia, stippled epiphyses (chondrodysplasia punctata), optic atrophy, and growth retardation. In the second and third trimesters, it carries a high risk of fetal intracranial hemorrhage. Therefore, in pregnant patients requiring anticoagulation (e.g., those with prosthetic heart valves), Warfarin is typically replaced by Low Molecular Weight Heparin (LMWH) or Unfractionated Heparin during the first trimester. **Why other options are incorrect:** * **Azithromycin (Option A):** This is a Macrolide antibiotic generally considered safe in pregnancy (Category B) and is often used to treat Chlamydia or respiratory infections. * **Propylthiouracil (Option C):** PTU is actually the **drug of choice** for hyperthyroidism in the **first trimester**. Unlike Methimazole, it is less associated with aplasia cutis and choanal atresia. * **Labetalol (Option D):** This is a first-line antihypertensive agent used throughout pregnancy for managing chronic hypertension or gestational hypertension. **NEET-PG High-Yield Pearls:** * **Heparin vs. Warfarin:** Heparin does not cross the placenta (large molecular weight), making it the anticoagulant of choice in pregnancy. * **Rule of Thumb for Hyperthyroidism:** Use **PTU** in the 1st trimester (to avoid Methimazole embryopathy) and switch to **Methimazole** in the 2nd/3rd trimesters (to avoid PTU-induced hepatotoxicity). * **ACE Inhibitors/ARBs:** These are contraindicated in the 2nd and 3rd trimesters due to risk of renal dysgenesis and oligohydramnios.

Question 390: A pregnant woman with recent onset of urinary frequency, urgency, dysuria, and evidence of bacteriuria should be treated with:

A. Ciprofloxacin
B. Norfloxacin
C. Trimethoprim-sulfamethoxazole
D. Cephalexin (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Cephalexin** **Medical Concept:** The patient presents with symptoms of **Acute Cystitis** (frequency, urgency, dysuria, and bacteriuria). In pregnancy, even asymptomatic bacteriuria must be treated to prevent progression to pyelonephritis, which is associated with preterm labor and maternal sepsis. **Cephalexin (a first-generation cephalosporin)** is considered a first-line treatment because it is safe (FDA Category B), effective against common uropathogens like *E. coli*, and lacks the teratogenic risks associated with other antibiotics. **Analysis of Incorrect Options:** * **A & B (Ciprofloxacin and Norfloxacin):** These are Fluoroquinolones. They are generally **contraindicated** in pregnancy because they have a high affinity for bone and cartilage, potentially leading to **arthropathy** and permanent joint damage in the developing fetus. * **C (Trimethoprim-sulfamethoxazole):** This combination is usually avoided in the **first trimester** (Trimethoprim is a folate antagonist linked to neural tube defects) and the **third trimester** (Sulfonamides compete with bilirubin for albumin binding sites, increasing the risk of **kernicterus** in the newborn). **High-Yield Clinical Pearls for NEET-PG:** * **First-line agents for UTI in pregnancy:** Nitrofurantoin (avoid near term/at 36+ weeks due to risk of neonatal hemolysis), Amoxicillin-Clavulanate, and Cephalexin. * **Screening:** All pregnant women should be screened for asymptomatic bacteriuria at **12–16 weeks** gestation via urine culture. * **Definition of Bacteriuria:** $\geq 10^5$ colony-forming units (CFU)/mL of a single uropathogen in a midstream voided specimen. * **Drug of Choice for Pyelonephritis in pregnancy:** Intravenous Ceftriaxone.

Practice by Chapter

Preconception Counseling

Practice Questions

Pregnancy Diagnosis and Dating

Practice Questions

Routine Antenatal Assessments

Practice Questions

Maternal Physiological Changes

Practice Questions

Nutrition in Pregnancy

Practice Questions

Screening Tests in Pregnancy

Practice Questions

Fetal Growth Assessment

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High-Risk Pregnancy Identification

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Antenatal Complications Management

Practice Questions

Psychosocial Aspects of Pregnancy

Practice Questions

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