Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 121: Which of the following conditions in a newborn typically does not require any specific treatment?

A. Epstein pearls
B. Bohn’s nodules
C. Gingival cysts of the newborn
D. All of the above (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. All of the above**. This question tests the recognition of benign, self-limiting oral mucosal lesions in the newborn that are often mistaken for pathology but require no medical or surgical intervention. 1. **Epstein Pearls:** These are small (1–3 mm), firm, white-to-yellowish keratin-filled cysts found specifically along the **median palatal raphe** (junction of the hard and soft palate). They are seen in approximately 60–85% of newborns and represent trapped epithelium during palatal fusion. 2. **Bohn’s Nodules:** These are similar keratin cysts but are located on the **buccal or lingual aspects of the dental ridges** (away from the midline) or at the junction of the hard and soft palate. They are remnants of minor salivary gland tissue. 3. **Gingival Cysts of the Newborn:** Also known as Dental Lamina Cysts, these occur on the **crests of the alveolar ridges**. They originate from remnants of the dental lamina. **Why "All of the above" is correct:** All three conditions are **transient and physiological**. They are asymptomatic, do not interfere with feeding, and typically rupture or undergo spontaneous involution within a few weeks to months after birth. Therefore, parental reassurance is the only management required. **High-Yield Clinical Pearls for NEET-PG:** * **Location is Key:** Epstein pearls = Midline palate; Bohn’s nodules = Buccal/Lingual ridge; Gingival cysts = Alveolar crest. * **Differential Diagnosis:** Do not confuse these with **Natal Teeth** (teeth present at birth), which may require extraction if they are hypermobile or causing sublingual ulceration (Riga-Fede disease). * **Milium:** Similar keratin cysts found on the skin (nose/cheeks) of newborns, also requiring no treatment.

Question 122: All of the following are true regarding pathological jaundice except:

A. Increase in unconjugated bilirubin only (Correct Answer)
B. May appear within the first 24 hours
C. May persist beyond 3 weeks
D. Maximum bilirubin > 5 mg/24 hours

Explanation: **Explanation:** Pathological jaundice in a neonate is defined by specific clinical criteria that distinguish it from physiological jaundice. **Why Option A is the correct answer (The Exception):** Pathological jaundice is **not** limited to an increase in unconjugated bilirubin only. It can manifest as an increase in **unconjugated bilirubin** (e.g., hemolysis, Crigler-Najjar) or **conjugated bilirubin** (e.g., biliary atresia, neonatal hepatitis). By definition, if the conjugated bilirubin fraction is **>1 mg/dL** (if TSB <5 mg/dL) or **>20% of Total Serum Bilirubin (TSB)**, it is always pathological. **Analysis of Incorrect Options (Criteria for Pathological Jaundice):** * **Option B:** Jaundice appearing within the **first 24 hours** of life is always pathological (most commonly due to ABO or Rh incompatibility). * **Option C:** Persistence of jaundice beyond **2 weeks** in term neonates or **3 weeks** in preterm neonates is a hallmark of pathological/prolonged jaundice. * **Option D:** A rapid rise in bilirubin levels, specifically **>5 mg/dL per day** (or >0.2 mg/dL per hour), indicates a pathological process rather than normal metabolic adaptation. **High-Yield Clinical Pearls for NEET-PG:** * **Total Serum Bilirubin (TSB) Threshold:** TSB >15 mg/dL in a term neonate is generally considered pathological. * **Kramer’s Rule:** Used for clinical assessment of jaundice (Face: 5 mg/dL; Sole: 15 mg/dL). * **Treatment:** Phototherapy converts bilirubin into **lumirubin** (structural isomer), which is water-soluble and excreted in urine without conjugation. * **Most common cause** of jaundice in the first 24 hours: **ABO Incompatibility.**

Question 123: A 32-week preterm baby presents with diffuse bilateral opacities on chest X-ray. What is the most likely diagnosis?

A. Congenital cystic adenomatoid malformation
B. Respiratory distress syndrome (RDS) (Correct Answer)
C. Congenital diaphragmatic hernia
D. Tracheoesophageal fistula

Explanation: ### Explanation **Correct Answer: B. Respiratory distress syndrome (RDS)** **Why it is correct:** Respiratory Distress Syndrome (RDS), also known as Hyaline Membrane Disease, is primarily caused by a **deficiency of surfactant** in preterm infants (typically <34 weeks). Surfactant reduces alveolar surface tension; its absence leads to widespread alveolar collapse (atelectasis). On a Chest X-ray (CXR), this manifests as **diffuse, bilateral, symmetrical "ground-glass" opacities** and **air bronchograms**. The 32-week gestational age in this clinical vignette is the most significant risk factor, making RDS the most likely diagnosis. **Why the other options are incorrect:** * **A. Congenital Cystic Adenomatoid Malformation (CCAM):** This usually presents as a multicystic mass in a single lung lobe, appearing as multiple air-filled cysts on CXR, rather than diffuse bilateral opacities. * **C. Congenital Diaphragmatic Hernia (CDH):** CXR typically shows loops of bowel in the hemithorax (usually the left) and a scaphoid abdomen. It does not present with diffuse bilateral opacities. * **D. Tracheoesophageal Fistula (TEF):** This presents with excessive salivation, choking, and inability to pass a nasogastric tube. CXR might show aspiration pneumonia or a coiled tube in the esophageal pouch, but not the classic diffuse ground-glass pattern of RDS. **High-Yield Clinical Pearls for NEET-PG:** * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **<2:1** in amniotic fluid indicates fetal lung immaturity. * **Antenatal Steroids:** Administering Betamethasone or Dexamethasone to the mother 24–48 hours before preterm delivery significantly reduces the incidence of RDS. * **Management:** The gold standard treatment is **Exogenous Surfactant replacement** (via the INSURE technique: Intubate-Surfactant-Extubate to CPAP). * **Complication:** Chronic lung disease (Bronchopulmonary Dysplasia) is a long-term sequel of RDS and oxygen toxicity.

Question 124: If a mother received lithium treatment for bipolar disorder during pregnancy, what fetal abnormality is the fetus most likely to show?

A. Neural tube defects
B. Facial defects
C. Urogenital defects
D. Cardiac defects (Correct Answer)

Explanation: **Explanation:** Lithium is a known teratogen when administered during the first trimester of pregnancy. It crosses the placenta and interferes with fetal organogenesis, primarily affecting the cardiovascular system. **1. Why Cardiac Defects is Correct:** The most characteristic fetal abnormality associated with maternal lithium use is **Ebstein’s Anomaly**. This is a congenital heart defect characterized by the downward displacement of the tricuspid valve leaflets into the right ventricle, leading to "atrialization" of the ventricle and severe tricuspid regurgitation. While the absolute risk remains relatively low, the relative risk of cardiac malformations is significantly higher in lithium-exposed pregnancies compared to the general population. **2. Why Other Options are Incorrect:** * **A. Neural Tube Defects:** These are primarily associated with **Valproate** and **Carbamazepine** (anticonvulsants), which interfere with folate metabolism. * **B. Facial Defects:** Cleft lip/palate can be seen with various drugs (like Phenytoin), but lithium is not the primary culprit. "Fetal Alcohol Syndrome" is the classic cause of distinct midface hypoplasia. * **C. Urogenital Defects:** These are more commonly associated with ACE inhibitors (renal dysgenesis) or maternal diabetes, rather than lithium. **3. NEET-PG Clinical Pearls:** * **Ebstein’s Anomaly:** Look for "box-shaped heart" on X-ray and "massive right atrium" on Echo. * **Neonatal Lithium Toxicity:** If taken near term, the neonate may present with **"Floppy Baby Syndrome"** (hypotonia), cyanosis, and lethargy. * **Management:** Fetal echocardiography is recommended at 18–22 weeks for mothers on lithium. * **Breastfeeding:** Lithium is generally discouraged during breastfeeding as it is excreted in milk and can cause neonatal toxicity.

Question 125: Vitamin K is administered to every child at what age?

A. At birth (Correct Answer)
B. At 9 months of age
C. At 5-6 years of age
D. Not required in Indian babies

Explanation: **Explanation:** **Why Option A is Correct:** Vitamin K is administered to all newborns **at birth** (within the first hour) to prevent **Vitamin K Deficiency Bleeding (VKDB)**, formerly known as Hemorrhagic Disease of the Newborn. Neonates are born with low Vitamin K stores because the vitamin crosses the placenta poorly, breast milk is a poor source, and the neonatal gut is sterile (lacking the bacteria required for Vitamin K synthesis). Since Vitamin K is essential for the activation of clotting factors **II, VII, IX, and X**, immediate supplementation is critical to prevent life-threatening intracranial or gastrointestinal bleeding. **Analysis of Incorrect Options:** * **Option B (9 months):** This is the age for the first dose of Vitamin A and the Measles/MR vaccine. Vitamin K must be given much earlier to prevent early and classical VKDB. * **Option C (5-6 years):** This is the age for the DPT second booster. Vitamin K is not routinely supplemented at this age as the gut flora is well-established. * **Option D:** This is incorrect. Indian babies, especially those exclusively breastfed, are at high risk for late VKDB; hence, universal prophylaxis is mandatory. **High-Yield Clinical Pearls for NEET-PG:** * **Dosage:** 1 mg IM for neonates >1000g; 0.5 mg IM for neonates <1000g. * **Route:** Intramuscular (IM) is the preferred route for maximum efficacy. * **Site:** Anterolateral aspect of the thigh (Vastus lateralis). * **VKDB Types:** Early (first 24 hrs), Classical (days 2-7), and Late (2 weeks to 6 months). Late VKDB is most commonly associated with exclusive breastfeeding and liver disease.

Question 126: Which of the following is NOT typically seen in small-for-date babies?

A. Hypoglycemia
B. Polycythemia
C. Intracranial bleed (Correct Answer)
D. Hypocalcemia

Explanation: **Explanation:** Small-for-date (SFD) or Small-for-Gestational-Age (SGA) babies are those whose birth weight is below the 10th percentile for their gestational age. The complications in these infants arise primarily from chronic placental insufficiency and depleted nutritional reserves, rather than the structural fragility seen in preterm infants. **Why Intracranial Bleed is the Correct Answer:** Intracranial hemorrhage (specifically Germinal Matrix Hemorrhage) is a classic complication of **preterm (premature) infants** due to the fragility of the germinal matrix and poor autoregulation of cerebral blood flow. SFD babies, if born at term, have more mature vascular structures and are **not** typically predisposed to intracranial bleeds unless there is associated birth asphyxia or trauma. **Analysis of Incorrect Options:** * **Hypoglycemia:** This is the most common metabolic complication in SFD babies due to low glycogen stores in the liver and subcutaneous fat, combined with a relatively large brain-to-body mass ratio that increases glucose demand. * **Polycythemia:** Chronic intrauterine hypoxia triggers increased erythropoietin production, leading to a high red cell mass (hematocrit >65%). * **Hypocalcemia:** Often seen in SFD babies due to high cortisol levels (secondary to stress) which can suppress parathyroid hormone, and associated perinatal asphyxia. **High-Yield Clinical Pearls for NEET-PG:** * **Ponderal Index:** Used to differentiate between Symmetrical (early insult) and Asymmetrical (late insult) SGA. * **Congenital Malformations:** More common in SFD babies than in preterm babies. * **Common SFD Complications:** Hypothermia, Hypoglycemia, Polycythemia, Hypocalcemia, and Meconium Aspiration Syndrome (MAS). * **Preterm vs. SFD:** Preterm babies suffer from "immaturity" (RDS, IVH, NEC), while SFD babies suffer from "depletion and hypoxia" (Hypoglycemia, Polycythemia, MAS).

Question 127: A newborn presents with jaundice. What is the most appropriate diagnostic investigation?

A. Total and Direct bilirubin (Correct Answer)
B. Conjugated bilirubin
C. Serum bilirubin
D. Uroporphyrin levels

Explanation: **Explanation:** In a newborn presenting with jaundice, the primary clinical objective is to differentiate between **unconjugated (indirect) hyperbilirubinemia** and **conjugated (direct) hyperbilirubinemia**. This distinction is critical because the management and prognosis of the two conditions differ significantly. **Why Option A is Correct:** Measuring both **Total and Direct bilirubin** is the gold standard initial step. By subtracting the direct fraction from the total, clinicians calculate the indirect bilirubin. * **Unconjugated hyperbilirubinemia** (e.g., physiological jaundice, hemolysis, or breast milk jaundice) carries a risk of **kernicterus** (bilirubin encephalopathy). * **Conjugated hyperbilirubinemia** (defined as direct bilirubin >1 mg/dL if TSB <5 mg/dL, or >20% of TSB) indicates serious underlying pathology like **biliary atresia** or neonatal hepatitis, which requires urgent surgical or medical intervention. **Why Other Options are Incorrect:** * **Option B (Conjugated bilirubin):** Measuring this alone is insufficient as it does not allow for the calculation of the unconjugated fraction or the total severity of jaundice. * **Option C (Serum bilirubin):** This is a vague term. In clinical practice, "Serum Bilirubin" must be fractionated into total and direct to be diagnostically useful. * **Option D (Uroporphyrin levels):** These are used in the diagnosis of Porphyrias, which are not the standard initial investigation for neonatal jaundice. **High-Yield Clinical Pearls for NEET-PG:** * **Kramer’s Rule:** Used for clinical estimation of jaundice (Face: 5 mg/dL; Umbilicus: 15 mg/dL; Soles: >15 mg/dL). * **Pathological Jaundice:** Suspect if jaundice appears within the **first 24 hours**, TSB rises >5 mg/dL/day, or persists >2 weeks in term infants. * **Biliary Atresia:** The most common cause of conjugated jaundice in the first 2 months; requires the **Kasai procedure** ideally before 60 days of life.

Question 128: What is the drug of choice for withdrawal syndrome in a neonate due to maternal opiate addiction?

A. Methadone (Correct Answer)
B. Buprenorphine
C. Phenobarbital
D. Self-limiting process, requiring only observation.

Explanation: **Explanation:** Neonatal Abstinence Syndrome (NAS) occurs due to the sudden cessation of fetal exposure to substances (primarily opioids) used by the mother during pregnancy. **1. Why Methadone is the Correct Answer:** Methadone is a long-acting full opioid agonist. It is considered the **drug of choice** for managing neonatal opiate withdrawal because it effectively prevents seizures, reduces agitation, and facilitates better feeding and weight gain. Its long half-life allows for stable plasma concentrations and a controlled, gradual weaning process. In many clinical guidelines, oral morphine is also used, but among the given options, Methadone is the gold standard pharmacological intervention. **2. Why the Other Options are Incorrect:** * **Buprenorphine:** While used in adults and increasingly studied in neonates, it is a partial agonist. It is currently not the first-line choice over Methadone in standard pediatric protocols for NAS. * **Phenobarbital:** This is the drug of choice for **non-opiate** withdrawal (e.g., sedative-hypnotics) or as a secondary agent if opioids alone fail to control symptoms. It does not address the specific opioid receptors involved in opiate withdrawal. * **Self-limiting process:** While mild cases are managed with supportive care (swaddling, low-stimulus environment), "maternal addiction" usually implies significant exposure requiring pharmacological intervention to prevent complications like seizures or severe dehydration. **High-Yield Clinical Pearls for NEET-PG:** * **Finnegan Scoring System:** The most common tool used to monitor the severity of NAS and decide when to initiate pharmacotherapy. * **Clinical Features:** High-pitched cry, tremors, hypertonicity, sneezing, yawning, and diarrhea. * **Naloxone Contraindication:** Never give Naloxone to a neonate born to an addicted mother, as it can precipitate **acute, life-threatening withdrawal seizures.**

Question 129: A newborn commonly has all of the following except?

A. Milia
B. CSF : Blood glucose ratio: > 0.6
C. Umbilical discharge (Correct Answer)
D. Stork bites

Explanation: **Explanation:** The correct answer is **C. Umbilical discharge**. In a healthy newborn, the umbilical cord should remain dry and undergo aseptic necrosis (mummification) before falling off between 7–14 days of life. Any discharge (serous, purulent, or bloody) is considered **pathological**. It may indicate **Omphalitis** (infection), a **Patent Vitellointestinal Duct** (fecal discharge), or a **Patent Urachus** (urine discharge). **Analysis of other options:** * **A. Milia:** These are tiny, white, keratin-filled cysts commonly found on the nose and cheeks of newborns. They are physiological and resolve spontaneously within a few weeks. * **B. CSF : Blood glucose ratio > 0.6:** In neonates, the blood-brain barrier is more permeable. A normal newborn CSF glucose level is typically higher relative to blood glucose than in adults. A ratio of **0.6 to 0.8** is considered normal for a term neonate (compared to ~0.6 in adults). * **D. Stork bites (Nevus Simplex):** These are common capillary vascular malformations (salmon patches) found on the nape of the neck, eyelids, or glabella. They are benign and usually fade with time. **High-Yield Clinical Pearls for NEET-PG:** * **Delayed cord separation (>3 weeks):** Highly suggestive of **Leukocyte Adhesion Deficiency (LAD)** or hypothyroidism. * **Umbilical Granuloma:** The most common cause of persistent umbilical discharge after cord separation; treated with **Silver Nitrate** application. * **Normal Neonatal CSF:** Protein levels can be high (up to 150 mg/dL in preterms), and WBC counts up to 20-30 cells/mm³ can be normal in the first week of life.

Question 130: Extremely low birth weight refers to neonates weighing:

A. Less than 2500 grams
B. Less than 2000 grams
C. Less than 1500 grams
D. Less than 1000 grams (Correct Answer)

Explanation: **Explanation:** The classification of neonates based on birth weight is a fundamental concept in neonatology and a high-yield topic for NEET-PG. The correct answer is **D (Less than 1000 grams)** because the World Health Organization (WHO) and the American Academy of Pediatrics (AAP) define **Extremely Low Birth Weight (ELBW)** specifically as a birth weight of less than 1000 grams, regardless of gestational age. **Analysis of Options:** * **Option A (Less than 2500g):** This defines **Low Birth Weight (LBW)**. It is the most common category and includes both preterm infants and small-for-gestational-age (SGA) infants. * **Option B (Less than 2000g):** While clinically significant, this is not a standard WHO classification threshold for birth weight terminology. * **Option C (Less than 1500g):** This defines **Very Low Birth Weight (VLBW)**. These infants are at significantly higher risk for complications like Respiratory Distress Syndrome (RDS) and Intraventricular Hemorrhage (IVH). **Clinical Pearls for NEET-PG:** * **Micropremie:** A term often used clinically for neonates weighing less than 750g or 800g. * **Macrosomia:** Defined as a birth weight of more than 4000g (some guidelines use 4500g), often associated with maternal diabetes. * **Ponderal Index:** Used to differentiate between symmetrical and asymmetrical IUGR; calculated as $[Weight (g) \times 100] / [Length (cm)^3]$. * **Survival:** ELBW infants represent the limit of viability; survival rates have improved significantly with the use of antenatal steroids and surfactant therapy.

Practice by Chapter

Neonatal Resuscitation

Practice Questions

Care of the Normal Newborn

Practice Questions

Prematurity and Low Birth Weight

Practice Questions

Respiratory Distress Syndrome

Practice Questions

Neonatal Jaundice

Practice Questions

Neonatal Sepsis

Practice Questions

Necrotizing Enterocolitis

Practice Questions

Intraventricular Hemorrhage

Practice Questions

Persistent Pulmonary Hypertension

Practice Questions

Perinatal Asphyxia

Practice Questions

Neonatal Seizures

Practice Questions

Congenital Anomalies

Practice Questions

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