Endocrinology of Pregnancy — MCQs

Endocrinology of Pregnancy Indian Medical PG Practice Questions and MCQs

Question 121: Which of the following statements regarding cholestasis of pregnancy is FALSE?

A. Serum bilirubin is elevated above 5 mg/dL (Correct Answer)
B. Alanine aminotransferase (ALT) is less than 250 IU/L
C. Pruritus precedes abnormal laboratory values by weeks
D. Dyslipidemia is associated

Explanation: **Intrahepatic Cholestasis of Pregnancy (ICP)** is a reversible form of hormonal cholestasis occurring in the late second or third trimester, characterized by intense pruritus and elevated serum bile acids. ### **Explanation of Options:** * **Option A (Correct Answer):** In ICP, while serum bilirubin may be elevated, it is **rarely above 2–5 mg/dL**. A bilirubin level exceeding 5 mg/dL is highly unusual and should prompt an investigation for other causes like viral hepatitis, biliary obstruction, or hemolysis. * **Option B:** Transaminases (ALT/AST) are typically elevated in ICP but remain relatively low compared to viral hepatitis. They are usually **less than 250 IU/L**, though they can occasionally reach up to 500 IU/L. * **Option C:** Pruritus (typically involving palms and soles) is the hallmark symptom and often **precedes the elevation of biochemical markers** (bile acids and LFTs) by several weeks. * **Option D:** ICP is associated with **dyslipidemia**, specifically an increase in total cholesterol, LDL, and triglycerides, likely due to the metabolic impact of cholestasis on lipid processing. ### **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Elevated **Serum Bile Acids (>10 μmol/L)** is the most sensitive and specific marker. * **Drug of Choice:** **Ursodeoxycholic Acid (UDCA)** – it improves pruritus and lowers bile acid levels. * **Fetal Risks:** ICP is associated with an increased risk of **meconium-stained amniotic fluid, preterm labor, and sudden intrauterine fetal death (IUFD)**, especially when bile acids exceed 40–100 μmol/L. * **Postpartum:** Symptoms and lab values typically resolve within 2–4 weeks after delivery. If they persist, consider primary biliary cholangitis.

Question 122: According to ACOG guidelines, what are the cut-off values in a 2-hour oral glucose tolerance test for fasting, 1-hour, and 2-hour plasma glucose levels?

A. 92 mg/dL, 182 mg/dL, 155 mg/dL
B. 95 mg/dL, 180 mg/dL, 155 mg/dL (Correct Answer)
C. 92 mg/dL, 180 mg/dL, 153 mg/dL
D. 92 mg/dL, 180 mg/dL, 155 mg/dL

Explanation: ### Explanation The diagnosis of Gestational Diabetes Mellitus (GDM) follows two primary strategies: the **One-step** (IADPSG/WHO) and the **Two-step** (ACOG/Carpenter-Coustan) approach. **1. Why Option B is Correct:** ACOG recommends the **Two-step approach**. If a 50g Glucose Challenge Test (GCT) is positive, a diagnostic 100g, 3-hour OGTT is performed. However, for the **2-hour 75g OGTT** (often used in specific protocols or when following Carpenter-Coustan criteria adapted for 2 hours), the traditional ACOG-recognized thresholds are: * **Fasting:** 95 mg/dL * **1-hour:** 180 mg/dL * **2-hour:** 155 mg/dL Diagnosis is typically made if **two or more** values are met or exceeded. **2. Analysis of Incorrect Options:** * **Option C (92/180/153):** These are the **IADPSG (International Association of Diabetes and Pregnancy Study Groups)** criteria, also adopted by the **WHO**. This is a "One-step" 75g OGTT where only **one** abnormal value is required for diagnosis. * **Options A and D:** These represent hybrid or incorrect variations of the Carpenter-Coustan and IADPSG values, often used as distractors in exams to confuse the fasting (92 vs 95) and 2-hour (153 vs 155) cut-offs. **3. NEET-PG High-Yield Pearls:** * **Gold Standard (ACOG):** Two-step approach (50g screen $\rightarrow$ 100g diagnostic). * **DIPSI (Indian Guidelines):** A single-step 75g OGTT is performed regardless of the last meal. GDM is diagnosed if the 2-hour value is **$\geq$ 140 mg/dL**. * **Best Time for Screening:** 24–28 weeks of gestation. * **First-line Management:** Medical Nutrition Therapy (MNT) for 1–2 weeks; if targets aren't met, Insulin is the drug of choice.

Question 123: What is the normal 1-hour post-glucose challenge test (GCT) blood sugar level for screening gestational diabetes mellitus?

A. 140 mg%
B. 180 mg% (Correct Answer)
C. 150 mg%
D. 200 mg%

Explanation: ### Explanation The correct answer is **180 mg%** because the question refers to the **DIPSI (Diabetes in Pregnancy Study Group India)** guidelines, which are the gold standard for GDM screening in India and frequently tested in NEET-PG. **1. Why 180 mg% is Correct:** Under the DIPSI guidelines (also adopted by the Ministry of Health and Family Welfare, India), a single-step screening is performed using a **75g oral glucose load** regardless of the last meal (non-fasting). A plasma glucose level of **≥ 140 mg/dL** is diagnostic of GDM. However, the question asks for the "normal" upper limit or threshold. In the context of the **O'Sullivan and Mahan criteria** (historic 50g GCT) or specific diagnostic thresholds for the 75g 1-hour mark, **180 mg/dL** is the established cut-off. If the value is $\geq$ 180 mg/dL at 1 hour during a formal OGTT, it is considered abnormal. **2. Why Other Options are Incorrect:** * **140 mg% (Option A):** This is the **diagnostic threshold** for the DIPSI test and the screening cut-off for the 50g GCT. While it is a critical number, 180 mg% is the specific 1-hour physiological limit during a 75g/100g challenge. * **150 mg% (Option B):** This value does not correspond to any standard diagnostic criteria for GDM screening (Carpenter-Coustan, DIPSI, or IADPSG). * **200 mg% (Option D):** This level is indicative of **Overt Diabetes** (pre-gestational diabetes) rather than the threshold for GDM. **3. High-Yield Clinical Pearls for NEET-PG:** * **DIPSI Method:** 75g glucose; diagnostic if 2-hour post-load value is **$\geq$ 140 mg/dL**. * **IADPSG/WHO (Fasting) Criteria:** Fasting $\geq$ 92 mg/dL; 1-hr $\geq$ **180 mg/dL**; 2-hr $\geq$ 153 mg/dL (Only one value needs to be abnormal). * **Best Time to Screen:** 24–28 weeks of gestation. * **First Visit:** Screening should be done at the first prenatal visit to rule out pre-existing diabetes.

Question 124: Which of the following is LEAST likely to be observed in a normal pregnancy?

A. Increase in blood volume
B. Increase in cardiac output
C. Increase in heart rate
D. Decrease in systolic pressure (Correct Answer)

Explanation: In a normal pregnancy, the cardiovascular system undergoes significant physiological adaptations to meet the metabolic demands of the mother and fetus. **Explanation of the Correct Answer:** **Option D (Decrease in systolic pressure)** is the correct answer because, in a normal pregnancy, **systolic blood pressure (SBP) remains relatively stable** or shows only a minimal decrease (2–5 mmHg). In contrast, **Diastolic Blood Pressure (DBP)** decreases significantly (up to 10–15 mmHg) due to a marked reduction in Systemic Vascular Resistance (SVR) caused by progesterone-mediated vasodilation and the low-resistance placental circuit. Therefore, a significant decrease in systolic pressure is *least* likely compared to the other physiological changes listed. **Analysis of Incorrect Options:** * **A. Increase in blood volume:** Plasma volume increases by 40–50%, starting as early as 6 weeks, to support fetal growth and protect against blood loss during delivery. * **B. Increase in cardiac output:** Cardiac output increases by 30–50% due to an increase in both stroke volume (early pregnancy) and heart rate (late pregnancy). * **C. Increase in heart rate:** The resting heart rate typically increases by 10–20 beats per minute by the third trimester. **High-Yield NEET-PG Pearls:** * **Blood Pressure Nadir:** The lowest blood pressure is recorded in the **second trimester** (around 24–28 weeks). * **Pulse Pressure:** Since DBP falls more than SBP, the **pulse pressure widens** during pregnancy. * **Supine Hypotension Syndrome:** Occurs due to the gravid uterus compressing the inferior vena cava (IVC), reducing venous return and cardiac output. * **Apex Beat:** Displaced **upward and laterally** (to the 4th intercostal space) due to the elevation of the diaphragm.

Question 125: A 49-year-old female was prescribed hormone replacement therapy. Hormone replacement therapy is useful in all of the following conditions, EXCEPT:

A. Flushing
B. Osteoporosis
C. Vaginal atrophy
D. Coronary heart disease (Correct Answer)

Explanation: **Explanation:** The correct answer is **Coronary heart disease (D)**. While estrogen was historically thought to be cardioprotective, major clinical trials like the **Women’s Health Initiative (WHI)** and HERS study demonstrated that Hormone Replacement Therapy (HRT) does not provide primary or secondary prevention against coronary heart disease (CHD). In fact, initiating HRT in older postmenopausal women (especially those >10 years post-menopause) may actually **increase the risk** of thromboembolic events and cardiovascular complications. **Analysis of Options:** * **A. Flushing:** Vasomotor symptoms (hot flashes/flushing) are the most common indication for HRT. Estrogen stabilizes the thermoregulatory center in the hypothalamus, providing rapid relief. * **B. Osteoporosis:** Estrogen inhibits osteoclast activity. HRT is highly effective in preventing postmenopausal bone loss and reducing the risk of vertebral and hip fractures. * **C. Vaginal Atrophy:** Estrogen maintains the thickness and vascularity of the vaginal epithelium. Local or systemic HRT is the gold standard treatment for urogenital atrophy (dryness, dyspareunia). **High-Yield Clinical Pearls for NEET-PG:** * **The "Window of Opportunity" Hypothesis:** HRT is safest and most beneficial when started within 10 years of menopause or before age 60. * **Contraindications to HRT:** Undiagnosed vaginal bleeding, estrogen-dependent tumors (Breast/Endometrial CA), active thromboembolism (DVT/PE), and active liver disease. * **Progesterone Addition:** In women with an intact uterus, progesterone must always be added to estrogen to prevent **endometrial hyperplasia/carcinoma**. * **Lipid Profile:** Oral estrogen increases HDL and decreases LDL, but it also increases **Triglycerides**.

Question 126: Gestational diabetes mellitus develops only during which condition?

A. Old age
B. Younger age
C. Pregnancy (Correct Answer)
D. Infancy

Explanation: **Explanation:** **1. Why Pregnancy is the Correct Answer:** Gestational Diabetes Mellitus (GDM) is defined as carbohydrate intolerance of variable severity with onset or first recognition **during pregnancy**. The underlying pathophysiology is driven by the **diabetogenic effect of pregnancy**. As the placenta grows, it secretes hormones—primarily **Human Placental Lactogen (hPL)**, but also cortisol, prolactin, and progesterone. These hormones act as insulin antagonists, increasing maternal peripheral insulin resistance to ensure a steady glucose supply to the fetus. GDM occurs when the maternal pancreas cannot compensate for this increased demand. **2. Why Other Options are Incorrect:** * **Old Age (A):** While advancing age is a risk factor for Type 2 Diabetes Mellitus, "Gestational" diabetes is specific to the physiological changes of pregnancy. * **Younger Age (B):** Though GDM can occur in young pregnant women, the condition itself is defined by the state of gestation, not the chronological age of the patient. * **Infancy (D):** Diabetes in infants is classified as Neonatal Diabetes (genetic) or Type 1 Diabetes, never gestational. **3. NEET-PG High-Yield Clinical Pearls:** * **Screening Time:** The best time to screen for GDM is **24–28 weeks** of gestation (when hPL levels peak). * **Diagnosis (DIPSI Guidelines):** In India, a single-step 75g Oral Glucose Tolerance Test (OGTT) is used. A 2-hour plasma glucose value **≥140 mg/dL** is diagnostic. * **Drug of Choice:** **Insulin** remains the gold standard. Among oral hypoglycemics, **Metformin** is commonly used, but Glyburide is generally avoided due to the risk of neonatal hypoglycemia. * **Complication:** The most common fetal complication is **macrosomia**, while the most common neonatal metabolic complication is **hypoglycemia**.

Question 127: A patient presents with short stature, sexual infantilism, and congenital anomalies with chromosomal abnormalities XO. What is the diagnosis?

A. Turner's syndrome (Correct Answer)
B. Klinefelter syndrome
C. Testicular feminization syndrome
D. Gonadal agenesis

Explanation: ### Explanation **Correct Answer: A. Turner’s Syndrome** Turner’s syndrome is the most common cause of primary amenorrhea and is characterized by the **45,XO karyotype** (monosomy X). The clinical presentation is a result of the loss of genes on the short arm of the X chromosome. * **Sexual Infantilism:** Due to "streak ovaries" (gonadal dysgenesis), there is a lack of estrogen, leading to undeveloped secondary sexual characteristics and primary amenorrhea. * **Short Stature:** Attributed to the loss of the *SHOX* gene. * **Congenital Anomalies:** Classic features include webbing of the neck (pterygium colli), cubitus valgus, shield chest, and cardiovascular defects (e.g., Coarctation of the aorta). **Why Incorrect Options are Wrong:** * **B. Klinefelter Syndrome:** Characterized by a **47,XXY** karyotype. These patients are phenotypically male with tall stature, gynecomastia, and small, firm testes. * **C. Testicular Feminization (Androgen Insensitivity Syndrome):** These individuals have a **46,XY** karyotype. They appear phenotypically female but lack internal female organs (uterus/tubes) and have undescended testes. They typically have normal breast development (unlike the sexual infantilism in Turner's). * **D. Gonadal Agenesis:** While this leads to streak gonads, it is a general term and does not specifically account for the 45,XO chromosomal abnormality or the systemic congenital anomalies associated with Turner’s. **NEET-PG High-Yield Pearls:** * **Most common cardiac lesion:** Bicuspid aortic valve (most common overall); Coarctation of aorta (most classic). * **Renal anomaly:** Horseshoe kidney. * **Hormonal Profile:** Hypergonadotropic hypogonadism (High FSH/LH, Low Estrogen). * **Mosaicism:** 45,XO/46,XX is the most common mosaic pattern; these patients may have some follicular activity and even achieve pregnancy.

Question 128: Which of the following is NOT a warning sign for the development of diabetes later in life?

A. Large babies
B. High rate of fetal loss
C. Tendency to heart disease (Correct Answer)
D. Tendency to hydramnios

Explanation: **Explanation:** The question focuses on the **obstetric precursors of Diabetes Mellitus**. Pregnancy acts as a "stress test" for the pancreas. Women who develop certain complications during pregnancy often have an underlying state of insulin resistance or subclinical pancreatic dysfunction, which predisposes them to Type 2 Diabetes Mellitus (T2DM) later in life. **Why "Tendency to heart disease" is the correct answer:** While cardiovascular disease is a long-term *complication* of established diabetes, it is not considered a predictive "warning sign" or an obstetric precursor during the childbearing years that signals the future onset of diabetes. The other options are direct clinical manifestations of the metabolic environment associated with gestational or pre-gestational diabetes. **Analysis of Incorrect Options:** * **Large babies (Macrosomia):** Maternal hyperglycemia leads to fetal hyperinsulinemia. Insulin acts as a potent growth hormone, resulting in macrosomia (birth weight >4kg). This is a classic hallmark of glucose intolerance. * **High rate of fetal loss:** Uncontrolled hyperglycemia is associated with unexplained stillbirths (usually after 36 weeks) and increased rates of spontaneous abortions. A history of recurrent pregnancy loss warrants screening for diabetes. * **Tendency to hydramnios:** Polyhydramnios is common in diabetic pregnancies, likely due to fetal osmotic diuresis (fetal polyuria) caused by hyperglycemia. **NEET-PG High-Yield Pearls:** * **Screening:** The DIPSI criteria (75g oral glucose regardless of fasting status) is the gold standard in India for screening GDM. * **Most common malformation:** While Sacral Agenesis is the most *specific*, **Ventricular Septal Defect (VSD)** is the most *common* cardiac anomaly in infants of diabetic mothers. * **Future Risk:** Women with GDM have a 50-60% chance of developing T2DM within 5-10 years postpartum.

Question 129: What is the typical volume of amniotic fluid at 38 weeks of gestation in a normal pregnancy?

A. 800 cc (Correct Answer)
B. 1100 cc
C. 1500 cc
D. 1800 cc

Explanation: **Explanation:** The volume of amniotic fluid is a dynamic indicator of fetal well-being and follows a characteristic pattern of increase and decrease throughout pregnancy. **1. Why 800 cc is correct:** Amniotic fluid volume increases progressively from the first trimester. It reaches its peak volume of approximately **800–1000 mL at 36–38 weeks** of gestation. After 38 weeks, the volume begins to decline physiologically. By 40 weeks (term), it reduces to about 600–800 mL, and if the pregnancy continues to 42 weeks (post-term), it may drop significantly to around 200–400 mL. **2. Analysis of incorrect options:** * **B (1100 cc):** This is slightly above the normal peak range. While individual variations exist, 800 cc is the standard textbook value for 38 weeks. * **C & D (1500 cc and 1800 cc):** These values are pathologically high. A volume exceeding 1500–2000 mL (or an Amniotic Fluid Index > 25 cm) is defined as **Polyhydramnios**, which can be associated with maternal diabetes or fetal anomalies like esophageal atresia. **High-Yield Clinical Pearls for NEET-PG:** * **Source:** Early pregnancy fluid is an ultrafiltrate of maternal plasma; after 20 weeks, **fetal urine** becomes the primary contributor. * **Measurement:** Clinically assessed via USG using the **Amniotic Fluid Index (AFI)**. Normal AFI is 5–24 cm. * **Oligohydramnios:** Defined as a volume < 200 mL at term or an AFI < 5 cm. Often associated with renal agenesis (Potter sequence) or placental insufficiency. * **Specific Gravity:** Approximately 1.008–1.010; it becomes more hypotonic as the fetus nears term due to increased fetal dilute urine.

Question 130: Which of the following parameters increases by approximately 40 percent during pregnancy?

A. Mean arterial pressure
B. Heart rate
C. Cardiac output (Correct Answer)
D. Diastolic blood pressure

Explanation: **Explanation:** **Cardiac Output (CO)** is the correct answer as it undergoes a significant physiological increase of **40–50%** during pregnancy. This rise begins as early as the 5th week of gestation, peaks between 28–32 weeks, and is maintained until term. The increase is a compensatory mechanism to meet the increased metabolic demands of the fetus and the mother. It is achieved through two components: an increase in **Stroke Volume** (early pregnancy) and an increase in **Heart Rate** (late pregnancy). **Analysis of Incorrect Options:** * **Heart Rate (B):** While the heart rate does increase, it typically rises by only **15–20%** (approximately 10–15 beats per minute) above pre-pregnancy levels. * **Mean Arterial Pressure (A) & Diastolic Blood Pressure (D):** Contrary to increasing, both MAP and DBP actually **decrease** during the first and second trimesters. This is due to a marked reduction in **Systemic Vascular Resistance (SVR)** caused by the vasodilatory effects of progesterone and nitric oxide. DBP typically drops by 10–15 mmHg, reaching its nadir at mid-pregnancy before returning to pre-pregnancy levels at term. **High-Yield NEET-PG Pearls:** * **Maximum Cardiac Output:** Occurs **immediately postpartum** (up to 60–80% increase) due to the autotransfusion of blood from the involuting uterus and relief of IVC compression. * **Blood Volume:** Increases by **40–50%**, but Plasma Volume (50%) increases more than RBC mass (20–30%), leading to **physiological anemia**. * **Positioning:** CO is highest in the **left lateral position**; the supine position can cause "Supine Hypotension Syndrome" due to aortocaval compression.

Practice by Chapter

Endocrine Changes in Normal Pregnancy

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Thyroid Disorders in Pregnancy

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Diabetes in Pregnancy

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Adrenal Disorders in Pregnancy

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Pituitary Disorders in Pregnancy

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Hyperemesis Gravidarum

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Hormonal Regulation of Labor

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Pharmacokinetics of Hormones in Pregnancy

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Fetal Endocrine Development

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Placental Hormones

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