Prenatal Care Practice Questions

Q: Fetal pulsations are palpable at the earliest by which gestational age?

20 weeks. **Explanation:** The correct answer is **20 weeks**. This question refers to the clinical sign known as **internal ballottement** or the manual palpation of fetal parts and movements through the maternal abdominal wall. **1. Why 20 weeks is correct:** By the 20th week of gestation (mid-pregnancy), the fetus has grown sufficiently in size and the volume of amniotic fluid is adequate to allow fetal parts to be felt through the abdominal wall. At this stage, the fundal height typically reaches the level of the umbilicus, making the uterus easily accessible for palpation of fetal movements and "fetal quickening" (maternal perception) is well-established. **2. Analysis of Incorrect Options:** * **16 weeks:** At this stage, the uterus is midway between the symphysis pubis and the umbilicus. While the fetus is moving, it is generally too small and the uterus is too low for distinct fetal pulsations/parts to be palpated externally by a clinician. * **18 weeks:** This is the typical time for **Quickening** in primigravida mothers, but clinical palpation of fetal parts by an examiner is usually not reliable until the 20th week. * **28 weeks:** By this time, fetal parts are very easily felt, and Leopold maneuvers can be performed to determine fetal lie and presentation. However, this is much later than the "earliest" possible time. **High-Yield Clinical Pearls for NEET-PG:** * **Quickening:** Perceived at 18 weeks in primigravida and 16 weeks in multigravida. * **Fetal Heart Sounds (FHS):** Can be heard by Doppler at 10–12 weeks and by Pinard stethoscope at 18–20 weeks. * **Fundal Height:** At 12 weeks (Symphysis Pubis), 20–22 weeks (Umbilicus), and 36 weeks (Xiphisternum). * **Internal Ballottement:** Can be elicited between 16–28 weeks.

Q: A 32-year-old woman, who has a 10-year-old child with Down syndrome, presents for prenatal care at 9 weeks of gestation. What advice should the doctor provide?

Plan for Chorionic Villus Sampling (CVS).. ### Explanation **1. Why Option C is Correct:** The patient has a significant risk factor: a **previous child with Down syndrome (Trisomy 21)**. This increases the recurrence risk for chromosomal abnormalities in subsequent pregnancies, regardless of maternal age. To provide a definitive diagnosis, a **diagnostic (invasive) test** is required rather than a screening test. Since the patient is currently at **9 weeks of gestation**, Chorionic Villus Sampling (CVS) is the most appropriate next step as it can be performed between **10–13 weeks**, allowing for an earlier diagnosis compared to amniocentesis (usually performed after 15 weeks). **2. Why Other Options are Incorrect:** * **Option A:** Blood investigations (like the Double Marker or Quadruple Screen) and NIPT are **screening tests**. They provide a risk probability but cannot definitively diagnose a chromosomal condition. * **Option B:** Ultrasound findings (like increased Nuchal Translucency) are **soft markers** or screening tools. While they suggest a higher risk, they are not confirmatory for Down syndrome. * **Option D:** While maternal age ≥35 is a classic risk factor, a **prior history of an affected child** is an independent indication for invasive prenatal diagnosis, regardless of the mother's current age. **3. Clinical Pearls for NEET-PG:** * **Definitive Diagnosis:** Only invasive tests (CVS or Amniocentesis) providing a **Karyotype** or **CMA** (Chromosomal Microarray) are diagnostic. * **Timing:** CVS (10–13 weeks); Amniocentesis (15–20 weeks). * **Recurrence Risk:** After one child with Trisomy 21, the recurrence risk is approximately **1%** or the age-related risk (whichever is higher). * **Most Common Marker:** Increased **Nuchal Translucency (NT)** on a 11–13.6 week scan is the most sensitive ultrasound marker for Down syndrome.

Q: Osiander's sign is positive in which of the following conditions?

First trimester of pregnancy. **Explanation:** **Osiander’s sign** is a clinical sign of early pregnancy characterized by **increased pulsation felt through the lateral vaginal fornices**. This occurs due to increased vascularity and pelvic congestion as the uterine artery supply to the gravid uterus intensifies. It typically becomes palpable around the **8th week** of gestation. **Why the correct answer is right:** * **A. First trimester of pregnancy:** During the first trimester, the body undergoes significant hemodynamic changes. The marked increase in blood flow to the pelvic organs to support the developing embryo results in the characteristic pulsations felt during a bimanual examination. **Why the incorrect options are wrong:** * **B. Fibroid:** While large fibroids can be vascular, they do not typically produce the rhythmic, synchronized arterial pulsations characteristic of Osiander’s sign. * **C. Hydatidiform mole:** Although a molar pregnancy is a gestational trophoblastic disease, the clinical signs usually emphasize a "doughy" feel of the uterus or "snowstorm" appearance on USG rather than the specific lateral fornix pulsations. * **D. Abdominal pregnancy:** In extrauterine pregnancies, the vascular supply is disorganized and does not follow the typical uterine artery hypertrophy seen in intrauterine pregnancies, making this sign absent. **High-Yield Clinical Pearls for NEET-PG:** * **Goodell’s Sign:** Softening of the cervix (6th week). * **Ladin’s Sign:** Softening in the anterior midline of the uterus at the cervico-uterine junction (6th week). * **Hegar’s Sign:** Softening of the lower uterine segment; the upper body and cervix feel like two separate regions (6–10 weeks). * **Chadwick’s Sign:** Bluish discoloration of the cervix, vagina, and labia due to venous congestion (8th week). * **Piscacek’s Sign:** Asymmetrical enlargement of the uterus if implantation occurs near a uterine horn.

Q: A 28-year-old woman, 13 weeks pregnant, presents for an antenatal clinic appointment. She feels embarrassed and produces only enough urine for a dipstick test, which is positive for leukocytes and nitrites. She denies any symptoms. What is the most appropriate treatment?

Cephalexin. **Explanation:** The patient presents with **Asymptomatic Bacteriuria (ASB)**, defined as the presence of $\ge 10^5$ colony-forming units (CFU)/mL of a single organism in a midstream urine sample from a woman without clinical symptoms of a urinary tract infection (UTI). In pregnancy, ASB must always be treated because 20–40% of untreated cases progress to **acute pyelonephritis**, which is associated with preterm labor and low birth weight. **Why Cephalexin is Correct:** Cephalosporins (like Cephalexin) are considered **first-line agents** for treating UTIs and ASB in pregnancy. They are Category B drugs, meaning they have a proven safety profile for both the mother and the fetus throughout all trimesters. **Why the Other Options are Incorrect:** * **Trimethoprim (Option A):** It is a folate antagonist. Use in the **first trimester** (this patient is 13 weeks) is contraindicated due to the risk of neural tube defects. It is also avoided near term due to the risk of neonatal kernicterus. * **Quinolones (Option B):** These are generally contraindicated in pregnancy as they may cause **arthropathy** and damage to fetal cartilage. * **Tetracycline (Option C):** These are contraindicated as they cause **discoloration of deciduous teeth** and can affect fetal bone growth. **NEET-PG High-Yield Pearls:** 1. **Screening:** All pregnant women should be screened for ASB at their first prenatal visit (ideally between 12–16 weeks) via **Urine Culture** (Gold Standard). 2. **Common Organism:** *E. coli* is the most common causative agent. 3. **Other Safe Options:** Nitrofurantoin (avoid at term/near labor due to risk of neonatal hemolysis) and Amoxicillin-Clavulanate. 4. **Follow-up:** A repeat urine culture is mandatory 1–2 weeks after completing treatment to ensure eradication.

Q: What is the appearance of the RBCs on the peripheral smear in physiological anemia of pregnancy?

Normocytic and Normochromic. ### Explanation **Correct Answer: C. Normocytic and Normochromic** **Why it is correct:** Physiological anemia of pregnancy is a **dilutional anemia**. During pregnancy, the plasma volume increases significantly (approx. 40–50%), while the red cell mass increases to a lesser extent (approx. 20–30%). This disproportionate rise leads to hemodilution, resulting in a lower hemoglobin concentration and hematocrit. However, the morphology of the individual red blood cells remains unaffected. Because the RBCs themselves are healthy and contain a normal amount of hemoglobin, they appear **Normocytic** (normal size/MCV) and **Normochromic** (normal color/MCHC) on a peripheral smear. **Why the other options are incorrect:** * **A & D (Microcytic):** Microcytic cells (low MCV) are characteristic of **Iron Deficiency Anemia (IDA)**, which is the most common *pathological* anemia in pregnancy. In IDA, cells are typically hypochromic as well. * **B (Macrocytic):** Macrocytic cells (high MCV) are seen in **Megaloblastic Anemia**, usually due to Folic Acid or Vitamin B12 deficiency. While common in pregnancy, this is a pathological state, not physiological. **High-Yield Clinical Pearls for NEET-PG:** * **Peak Hemodilution:** Occurs between **28–32 weeks** of gestation. * **WHO Definition:** Anemia in pregnancy is defined as **Hb < 11 g/dL**. * **ICMR/National Guidelines (India):** Anemia is defined as **Hb < 11 g/dL**; severe anemia is **< 7 g/dL**. * **Purpose:** Physiological anemia reduces blood viscosity, improving placental perfusion and protecting the mother against blood loss during delivery. * **MCV/MCHC:** These indices remain **stable** in physiological anemia; any deviation suggests a nutritional deficiency.

Q: Which of the following conditions is best diagnosed with ultrasound in the first trimester?

Anencephaly. **Explanation:** **Anencephaly** is the correct answer because it is one of the few structural anomalies that can be reliably diagnosed via ultrasound as early as the late first trimester (11–14 weeks). The diagnosis is based on the absence of the cranial vault (acrania) and the presence of the "Mickey Mouse" sign or "Frog-eye" appearance on coronal views, caused by the protrusion of the orbits due to the lack of frontal bones. **Why other options are incorrect:** * **Neural Tube Defects (NTDs) & Meningocele:** While anencephaly is a type of NTD, most other NTDs (like spina bifida or meningoceles) are typically diagnosed during the second-trimester anomaly scan (18–22 weeks). In the first trimester, the ossification of the spine is incomplete, and small defects or sacs are difficult to visualize. While "indirect" signs like an abnormal intracranial translucency (IT) may suggest a risk, a definitive diagnosis is usually deferred to the second trimester. **High-Yield Clinical Pearls for NEET-PG:** * **Acrania-Anencephaly Sequence:** Acrania (absence of skull bones with brain tissue present) is the precursor to anencephaly; the unprotected brain tissue eventually degenerates due to exposure to amniotic fluid. * **Earliest Diagnosis:** Anencephaly can be suspected at 10 weeks and confirmed by 11–14 weeks (CRL >45mm). * **Biochemical Marker:** Maternal Serum Alpha-Fetoprotein (MSAFP) is significantly **elevated** in open NTDs like anencephaly. * **Associated Finding:** Polyhydramnios is common in the late second/third trimester due to the fetus's inability to swallow. * **Prevention:** 400 mcg/day of Folic Acid pre-conceptionally reduces the risk of NTDs by 70%.

Q: A pregnant patient in her second trimester experiences syncope during the extraction of upper molars. In what position should she be kept?

Left lateral position. ### Explanation The correct answer is **D. Left lateral position.** **1. Why Left Lateral Position is Correct:** The patient is experiencing **Supine Hypotension Syndrome** (also known as Aortocaval Compression Syndrome). In the second and third trimesters, the gravid uterus is large enough to compress the **Inferior Vena Cava (IVC)** and the abdominal aorta when the patient lies flat (supine). Compression of the IVC leads to decreased venous return to the heart, resulting in reduced cardiac output, hypotension, and syncope. Placing the patient in the **left lateral position** (or tilting the right hip 15–30 degrees) shifts the uterus off the IVC, restoring venous return and stabilizing maternal blood pressure. **2. Why Incorrect Options are Wrong:** * **Trendelenburg Position (A) & Head down (B):** While these positions are traditionally used to increase cerebral blood flow in non-pregnant patients, in pregnancy, they can worsen the situation. The weight of the uterus would push further against the diaphragm (compromising respiration) and continue to compress the IVC, failing to resolve the underlying cause of the syncope. * **Right Lateral Position (C):** While better than lying flat, the IVC is located on the right side of the vertebral column. Turning to the right may still result in partial compression of the vessel compared to the left side. **3. NEET-PG High-Yield Facts:** * **Aortocaval Compression:** Occurs most significantly after **20 weeks** of gestation. * **Clinical Presentation:** Pallor, bradycardia, sweating, nausea, and hypotension when supine. * **Management of Cardiac Arrest in Pregnancy:** If a pregnant woman (over 20 weeks) requires CPR, **Manual Left Uterine Displacement (LUD)** is mandatory to ensure effective chest compressions and cardiac output. * **Dental Procedures:** Pregnant patients should ideally be treated in a semi-reclined position with a wedge under the right hip to prevent syncope.

Q: In the first trimester, all of the following fetal anomalies can be well appreciated, except?

Hydrocephalus. **Explanation:** The correct answer is **Hydrocephalus**. In the first trimester (specifically before 13-14 weeks), the fetal brain undergoes significant developmental changes. The choroid plexus normally fills a large portion of the lateral ventricles, making the diagnosis of ventriculomegaly or hydrocephalus unreliable. Hydrocephalus typically manifests in the second or third trimester as cerebrospinal fluid (CSF) dynamics stabilize and the brain parenchyma develops further. **Analysis of Options:** * **Nuchal Translucency (NT):** This is the hallmark of first-trimester screening (11–13+6 weeks). Increased NT is a vital marker for chromosomal anomalies (like Down Syndrome) and structural defects. * **Crown-Rump Length (CRL):** This is the most accurate parameter for gestational age dating in the first trimester. It is measured from the top of the head to the bottom of the buttocks. * **Anencephaly:** This is a lethal neural tube defect characterized by the absence of the cranial vault. It can be detected as early as 11–14 weeks (often referred to as the "acrania-anencephaly sequence") via the "Mickey Mouse sign" on ultrasound. **NEET-PG High-Yield Pearls:** 1. **Ideal time for NT scan:** 11 weeks to 13 weeks 6 days (CRL must be between 45mm and 84mm). 2. **Anencephaly:** Can be diagnosed in the late first trimester, but **Hydrocephalus** and **Microcephaly** are typically second-trimester diagnoses. 3. **Best time for Level II (Anomaly) Scan:** 18–20 weeks of gestation. 4. **First sign of Hydrocephalus on USG:** "Dangling choroid sign" (the choroid plexus falls toward the dependent wall of the lateral ventricle).

Q: What is the treatment for genital warts in pregnancy?

Cryotherapy. **Explanation:** The management of genital warts (Condyloma acuminata) during pregnancy focuses on using modalities that are non-teratogenic and do not pose systemic risks to the fetus. **Why Cryotherapy is Correct:** **Cryotherapy** (using liquid nitrogen) is considered a first-line treatment in pregnancy. It is a **physical ablation** method that works by thermal-induced tissue necrosis. Since it acts locally and does not involve systemic absorption of chemicals, it is safe for both the mother and the fetus. Other safe physical methods include Trichloroacetic acid (TCA 80-90%), surgical excision, and CO2 laser. **Why Other Options are Incorrect:** * **Podophyllin (Option A):** It is strictly **contraindicated** in pregnancy. It is a cytotoxic agent that can be systemically absorbed, leading to fetal death, preterm labor, and teratogenic effects. * **Salicylic acid and Lactic acid (Option B):** These are keratolytic agents typically used for common skin warts. They are generally avoided in the sensitive anogenital area and are not the standard of care for genital warts in pregnancy. * **Imiquimod (Option C):** This is an immune response modifier. While some guidelines suggest it may be used with caution, it is generally **avoided** in pregnancy due to a lack of high-quality safety data compared to physical ablation. **High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** Caused by HPV types **6 and 11** (low risk). * **Mode of Delivery:** Genital warts are **not** an absolute indication for Cesarean section. C-section is only indicated if the warts are so large they obstruct the birth canal or if vaginal delivery would result in massive hemorrhage. * **Neonatal Risk:** The primary concern for the neonate is **Juvenile Onset Recurrent Respiratory Papillomatosis (JORRP)**, though the risk is low and not significantly reduced by C-section.

Q: Which of the following diseases cannot be diagnosed by amniocentesis?

Cleft lip. **Explanation:** Amniocentesis is a procedure used to obtain amniotic fluid, which contains desquamated fetal cells (amniocytes) and biochemical substances. These cells are used for **karyotyping, DNA analysis, and enzyme assays**. **Why Cleft Lip is the correct answer:** Cleft lip (with or without cleft palate) is a **structural/anatomical malformation**. While it can sometimes be associated with genetic syndromes, isolated cleft lip cannot be diagnosed via chromosomal or biochemical analysis of amniotic fluid. Structural defects are primarily diagnosed using **Targeted Imaging for Fetal Anomalies (TIFFA)** or a Level II Ultrasound scan, usually performed between 18–20 weeks of gestation. **Analysis of Incorrect Options:** * **Trisomy 21 (Down Syndrome):** This is a chromosomal numerical abnormality. Amniocytes are cultured and subjected to **karyotyping** or FISH (Fluorescence In Situ Hybridization) to confirm the presence of an extra chromosome 21. * **Duchenne’s Muscular Dystrophy (DMD):** This is an X-linked recessive genetic disorder. It can be diagnosed by performing **DNA analysis** (PCR for dystrophin gene deletions) on the fetal cells obtained. * **Lesch-Nyhan Syndrome:** This is an inborn error of purine metabolism (HGPRT deficiency). It can be diagnosed via **biochemical enzyme assays** or molecular genetic testing of the amniotic fluid. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Amniocentesis is ideally performed between **15–20 weeks** of gestation. * **Alpha-Fetoprotein (AFP):** Elevated amniotic fluid AFP is a marker for **Neural Tube Defects (NTDs)** like anencephaly and spina bifida. * **L/S Ratio:** Amniocentesis is also used to assess fetal lung maturity by measuring the Lecithin/Sphingomyelin ratio (Normal > 2:1). * **Risk:** The procedure-related risk of miscarriage is approximately **0.5%**.

Question 1

Fetal pulsations are palpable at the earliest by which gestational age?

Accepted Answer

20 weeks

Answer

16 weeks

Answer

18 weeks

Answer

28 weeks

Question 2

A 32-year-old woman, who has a 10-year-old child with Down syndrome, presents for prenatal care at 9 weeks of gestation. What advice should the doctor provide?

Accepted Answer

Plan for Chorionic Villus Sampling (CVS).

Answer

Blood investigations can definitively diagnose Down syndrome.

Answer

Ultrasound diagnosis can be definitive for Down syndrome.

Answer

No further investigations are useful because the patient's age is less than 35 years.

Question 3

Osiander's sign is positive in which of the following conditions?

Accepted Answer

First trimester of pregnancy

Answer

Fibroid

Answer

Hydatidiform mole

Answer

Abdominal pregnancy

Question 4

A 28-year-old woman, 13 weeks pregnant, presents for an antenatal clinic appointment. She feels embarrassed and produces only enough urine for a dipstick test, which is positive for leukocytes and nitrites. She denies any symptoms. What is the most appropriate treatment?

Accepted Answer

Cephalexin

Answer

Trimethoprim

Answer

Quinolone

Answer

Tetracycline

Question 5

What is the appearance of the RBCs on the peripheral smear in physiological anemia of pregnancy?

Accepted Answer

Normocytic and Normochromic

Answer

Microcytic and Hypochromic

Answer

Macrocytic and Hyperchromic

Answer

Microcytic and Normochromic

Question 6

Which of the following conditions is best diagnosed with ultrasound in the first trimester?

Accepted Answer

Anencephaly

Answer

Neural tube defects

Answer

Meningocele

Answer

Option not recalled

Question 7

A pregnant patient in her second trimester experiences syncope during the extraction of upper molars. In what position should she be kept?

Accepted Answer

Left lateral position

Answer

Trendelenburg position

Answer

Head down towards her feet

Answer

Right lateral position

Question 8

In the first trimester, all of the following fetal anomalies can be well appreciated, except?

Accepted Answer

Hydrocephalus

Answer

Nuchal Translucency

Answer

Crown-Rump Length (CRL)

Answer

Anencephaly

Question 9

What is the treatment for genital warts in pregnancy?

Accepted Answer

Cryotherapy

Answer

Podophyllin

Answer

Salicylic acid and lactic acid

Answer

Imiquimod

Question 10

Which of the following diseases cannot be diagnosed by amniocentesis?

Accepted Answer

Cleft lip

Answer

Trisomy 21

Answer

Duchenne's muscular dystrophy

Answer

Lesch-Nyhan syndrome

Prenatal Care — MCQs

Prenatal Care — MCQs

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