Endocrinology of Pregnancy — MCQs

Endocrinology of Pregnancy Indian Medical PG Practice Questions and MCQs

Question 221: Concerning the gastrointestinal (GI) tract during pregnancy, which of the following is true?

A. Gastric emptying time is increased in each trimester
B. Epulis is a systemic, highly vascular swelling of mucosal membranes
C. Gastric emptying time is shortened during labor
D. Pyrosis is caused by reflux of acidic secretions into the lower esophagus (Correct Answer)

Explanation: **Explanation:** **1. Why the correct answer is right:** **Pyrosis (heartburn)** is one of the most common GI complaints in pregnancy, affecting up to 80% of women. It is primarily caused by the **reflux of acidic gastric contents** into the lower esophagus. This occurs due to two main factors: * **Progesterone effect:** It relaxes the Lower Esophageal Sphincter (LES) tone. * **Mechanical effect:** The enlarging uterus increases intra-abdominal pressure, forcing contents upward. **2. Why the incorrect options are wrong:** * **Option A:** Gastric emptying time remains **largely unchanged** during normal pregnancy trimesters. It does not significantly increase or decrease until the onset of labor. * **Option B:** **Epulis (Pregnancy Tumor)** is a focal, highly vascular swelling of the **gums (gingiva)**, not a systemic swelling of all mucosal membranes. It is a pyogenic granuloma that usually regresses postpartum. * **Option C:** Gastric emptying time is significantly **prolonged (delayed)** during labor, especially if opioid analgesics are administered. This increases the risk of aspiration (Mendelson’s Syndrome) during general anesthesia. **3. High-Yield Clinical Pearls for NEET-PG:** * **Gums:** Become hyperemic and spongy (Gingivitis) due to increased vascularity. * **Gallbladder:** Progesterone causes gallbladder atony and stasis, increasing the risk of **cholesterol gallstones**. * **Appendix:** Displaced **upward and laterally** toward the right flank; the point of maximum tenderness shifts superiorly. * **Liver:** Alkaline Phosphatase (ALP) levels **double** (due to placental isoenzymes), but ALT, AST, and Bilirubin remain within normal limits. * **Hemorrhoids:** Common due to constipation and increased pressure on pelvic veins.

Question 222: Which of the following are features of diabetes mellitus in pregnancy?

A. Hydramnios, Neonatal hyperglycemia, Increased congenital defects (Correct Answer)
B. Postdatism, Neonatal hyperglycemia, Increased congenital defects
C. Postdatism, Neonatal hyperglycemia, Postpartum hemorrhage
D. Hydramnios, Neonatal hyperglycemia, Postpartum hemorrhage

Explanation: ### Explanation Diabetes mellitus in pregnancy (both pre-gestational and gestational) significantly impacts maternal and fetal outcomes due to the metabolic derangements caused by hyperglycemia. **1. Why Option A is Correct:** * **Hydramnios (Polyhydramnios):** Maternal hyperglycemia leads to fetal hyperglycemia. This causes **fetal osmotic diuresis**, resulting in increased fetal urine production, which is the primary source of excess amniotic fluid. * **Neonatal Hypoglycemia (Note on the Question):** While the option mentions "Neonatal Hyperglycemia," it is important to clarify the clinical sequence: the fetus is **hyperglycemic** in utero, which leads to fetal hyperinsulinemia. Immediately after birth, the glucose supply from the mother is cut off, but the high insulin levels persist, leading to **Neonatal Hypoglycemia**. (In the context of this specific MCQ, "Neonatal hyperglycemia" is often used in older question banks to refer to the fetal state that persists into the immediate transition, though hypoglycemia is the clinical emergency). * **Increased Congenital Defects:** Hyperglycemia during organogenesis (first trimester) is **teratogenic**. Common defects include Sacral Agenesis (most specific), VSD (most common), and Neural Tube Defects. **2. Why Other Options are Incorrect:** * **Postdatism:** Diabetes is generally an indication for **timed delivery** (usually 38–39 weeks). It is not typically associated with prolonged pregnancy (postdatism); rather, it increases the risk of preterm labor or indicated preterm delivery. * **Postpartum Hemorrhage (PPH):** While polyhydramnios and macrosomia (common in diabetes) can cause uterine atony leading to PPH, it is a secondary complication rather than a primary diagnostic feature of the diabetic state itself compared to the classic triad in Option A. **3. NEET-PG High-Yield Pearls:** * **Most Specific Malformation:** Caudal Regression Syndrome (Sacral Agenesis). * **Most Common Malformation:** Cardiac defects (specifically Ventricular Septal Defect). * **HbA1c Goal:** Ideally <6% pre-conception to minimize the risk of anomalies. * **Fetal Echo:** Recommended at 22–24 weeks for diabetic mothers due to the high risk of cardiac anomalies.

Question 223: During pregnancy, the maternal blood volume increases by nearly:

A. 5-10%
B. 15-20%
C. 50% (Correct Answer)
D. 70%

Explanation: **Explanation:** The correct answer is **50%**. Maternal blood volume begins to increase as early as the 6th week of gestation, reaching its peak expansion of approximately **40–50%** above non-pregnant levels by 32–34 weeks. **Why it is correct:** This physiological hypervolemia is driven by an increase in both plasma volume (approx. 45–50%) and red cell mass (approx. 20–30%). The primary purpose is to meet the metabolic demands of the enlarging uterus, protect the mother against the effects of decreased venous return in the supine position, and provide a "safety cushion" against blood loss during parturition. **Why other options are incorrect:** * **A & B (5-20%):** These values are far too low. Such minimal increases would be insufficient to support the uteroplacental circulation and would leave the mother vulnerable to hypovolemic shock during delivery. * **D (70%):** While blood volume increases significantly, a 70% increase is pathological and would place an extreme, unsustainable load on the maternal heart, potentially leading to high-output cardiac failure. **High-Yield Clinical Pearls for NEET-PG:** * **Physiological Anemia:** Because the plasma volume increases (50%) more than the red cell mass (20-30%), a state of **hemodilution** occurs. This results in a physiological drop in hemoglobin concentration (nadir usually at 30 weeks). * **Cardiac Output:** Increases by about 40%, peaking at 20–24 weeks. * **Stroke Volume:** Increases early in pregnancy, while **Heart Rate** increases later (by 10–15 bpm). * **Blood Pressure:** Diastolic BP decreases more than systolic BP, reaching its lowest point in the second trimester due to decreased systemic vascular resistance (SVR).

Question 224: Increased LH:FSH ratio is found in which of the following conditions?

A. Premature menopause
B. Sheehan syndrome
C. Polycystic ovary syndrome (Correct Answer)
D. Turner's syndrome

Explanation: **Explanation:** The hallmark of **Polycystic Ovary Syndrome (PCOS)** is a neuroendocrine derangement characterized by an increased frequency of GnRH pulses. This high-frequency pulsing preferentially stimulates the anterior pituitary to produce **LH** over FSH. Consequently, the **LH:FSH ratio is typically >2:1 or 3:1**. The elevated LH leads to hyperplasia of the ovarian theca cells and excessive androgen production, while the relatively low FSH results in poor follicular recruitment and the "necklace appearance" of subcapsular cysts. **Analysis of Incorrect Options:** * **Premature Menopause & Turner’s Syndrome:** Both are forms of hypergonadotropic hypogonadism (primary ovarian failure). In these conditions, the lack of negative feedback from estrogen leads to an elevation of both LH and FSH. However, **FSH rises more significantly** than LH because FSH has a longer half-life and slower clearance, resulting in a decreased LH:FSH ratio. * **Sheehan Syndrome:** This is a form of hypogonadotropic hypogonadism caused by postpartum pituitary necrosis. Here, the levels of **both LH and FSH are low** due to pituitary gland destruction. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for PCOS Diagnosis:** Rotterdam Criteria (requires 2 out of 3: Oligo/anovulation, Hyperandrogenism, and Polycystic ovaries on USG). * **Biochemical Marker:** Anti-Müllerian Hormone (AMH) levels are typically elevated in PCOS. * **Insulin Resistance:** This is a key driver in PCOS, often manifesting clinically as *Acanthosis nigricans*. * **FSH > 40 IU/L** is the diagnostic threshold for Premature Ovarian Failure (Premature Menopause).

Question 225: Destruction of ovaries prior to the 7th week following fertilization results in what?

A. Pseudohermaphroditism
B. Uterine agenesis
C. Masculinisation
D. None of the above (Correct Answer)

Explanation: The correct answer is **D. None of the above.** ### **Explanation** The key to this question lies in understanding the **Luteo-Placental Shift** and the default pathway of female sexual differentiation. 1. **The Luteo-Placental Shift:** During early pregnancy, the corpus luteum of the ovary is the primary source of progesterone, which is essential for maintaining the pregnancy. However, between the **7th and 9th weeks** of gestation, the placenta takes over progesterone production. If the ovaries (and thus the corpus luteum) are removed **before the 7th week**, the pregnancy cannot be maintained, resulting in a **spontaneous abortion (miscarriage)** rather than developmental anomalies. 2. **Default Female Development:** In embryology, female phenotypic development is the "default" pathway. It occurs in the **absence** of the SRY gene and Testis Determining Factor (TDF). Unlike males, who require testosterone and Anti-Müllerian Hormone (AMH) for differentiation, female internal and external genitalia develop regardless of whether fetal ovaries are present or functional. ### **Why Incorrect Options are Wrong** * **A & C (Pseudohermaphroditism/Masculinisation):** These require the presence of androgens (e.g., Congenital Adrenal Hyperplasia). Removing ovaries removes a source of estrogen, but it does not introduce male hormones; therefore, masculinization does not occur. * **B (Uterine Agenesis):** The uterus develops from the Müllerian ducts. This process is independent of ovarian hormones and depends solely on the absence of AMH (which is produced by fetal testes). ### **High-Yield Clinical Pearls for NEET-PG** * **Luteo-placental shift:** Occurs between 7–9 weeks. * **Oophorectomy in pregnancy:** If required before 9 weeks, exogenous progesterone (e.g., 17-OHP) must be administered to prevent miscarriage. * **Müllerian Development:** Occurs automatically unless suppressed by AMH (Sertoli cells) and Testosterone (Leydig cells).

Question 226: Pregnant women with obesity are at higher risk of the following, except?

A. Fetal macrosomia
B. Fetal distress
C. Gestational hypertension
D. Infections (Correct Answer)

Explanation: **Explanation:** Obesity in pregnancy is associated with a wide range of maternal and fetal complications due to metabolic changes, chronic inflammation, and altered placental function. However, when analyzing the options provided in the context of standard obstetric risks: * **Why 'Infections' is the correct (Except) answer:** While obesity is a risk factor for **postoperative** wound infections (post-Cesarean) and urinary tract infections, it is not traditionally categorized as a primary systemic risk of the pregnancy itself in the same way as metabolic or hypertensive disorders. In the context of this specific MCQ, the other three options are direct, high-frequency complications of the obese gravid state. * **Why the other options are incorrect (Risks associated with obesity):** * **Fetal Macrosomia:** Maternal obesity leads to insulin resistance and increased nutrient transfer (glucose and lipids) across the placenta, stimulating fetal growth and resulting in a birth weight >4000g. * **Fetal Distress:** Obese women have a higher incidence of placental insufficiency, sleep apnea, and prolonged labor, all of which increase the risk of intrapartum fetal distress and meconium aspiration. * **Gestational Hypertension:** Obesity is a potent risk factor for hypertensive disorders of pregnancy (HDP), including Preeclampsia, due to underlying chronic inflammation and endothelial dysfunction. **High-Yield Clinical Pearls for NEET-PG:** 1. **Congenital Anomalies:** Obesity is specifically linked to an increased risk of **Neural Tube Defects (NTDs)** and cardiac defects, often because ultrasound visualization is technically difficult. 2. **Labor Complications:** There is a significantly higher rate of **Induction of Labor (IOL)**, failed induction, and **Shoulder Dystocia** (due to macrosomia). 3. **Anesthesia Risk:** Obese patients are at higher risk for difficult intubation and spinal/epidural failure. 4. **Postpartum:** Increased risk of **Postpartum Hemorrhage (PPH)** and Thromboembolism (VTE).

Question 227: What is the uterine blood flow at term?

A. 800-1200 ml/min
B. 50-70 ml/min
C. 175-200 ml/min
D. 500-750 ml/min (Correct Answer)

Explanation: **Explanation:** The correct answer is **D (500-750 ml/min)**. In a non-pregnant state, uterine blood flow is approximately **50 ml/min**. During pregnancy, the uterus undergoes massive physiological adaptation to meet the metabolic demands of the growing fetus and placenta. By term, the uterine blood flow increases significantly, reaching **500-750 ml/min**, which represents about **10-15% of the total cardiac output**. This increase is facilitated by: 1. **Vasodilation:** Reduced vascular resistance due to the action of estrogen, progesterone, and nitric oxide. 2. **Remodeling:** Trophoblastic invasion of the spiral arteries, converting them into high-flow, low-resistance vessels. **Analysis of Incorrect Options:** * **Option A (800-1200 ml/min):** This value is too high and exceeds the typical physiological range for uterine perfusion, even at term. * **Option B (50-70 ml/min):** This represents the **pre-pregnancy** or non-gravid uterine blood flow. * **Option C (175-200 ml/min):** This represents uterine blood flow during the **second trimester** (around 20-24 weeks), before it reaches its peak at term. **NEET-PG High-Yield Pearls:** * **Distribution:** At term, approximately **80-90%** of the uterine blood flow is directed to the **placenta** (intervillous space), while the remainder supplies the myometrium. * **Positioning:** Uterine blood flow can be decreased by the **supine position** due to aortocaval compression (Supine Hypotension Syndrome). * **Autoregulation:** Unlike the brain or kidneys, the uteroplacental circulation lacks significant autoregulation; therefore, flow is directly dependent on maternal systemic blood pressure.

Question 228: A 26-year-old patient presents with secondary amenorrhea for 4 months. Serum prolactin and beta-hCG assays are ordered. The pregnancy test is positive, and the prolactin level is 100 ng/mL (normal <25 ng/mL). What is the most appropriate next step in management?

A. Routine obstetric care (Correct Answer)
B. Computed tomography (CT) scan of the sella turcica to rule out pituitary adenoma
C. Repeat measurements of serum prolactin to ensure that values do not increase over 300 ng/mL
D. Bromocriptine to suppress prolactin

Explanation: **Explanation:** The correct answer is **Routine obstetric care**. **1. Why it is correct:** In a pregnant patient, a serum prolactin level of 100 ng/mL is a **physiological finding**. During pregnancy, prolactin levels rise progressively (often increasing 10-fold) due to estrogen-induced hypertrophy and hyperplasia of the lactotroph cells in the anterior pituitary. By the third trimester, levels can reach 200–400 ng/mL. Since the patient has a positive beta-hCG, the elevated prolactin is expected and does not require further investigation or intervention in the absence of visual field defects or severe headaches. **2. Why the other options are incorrect:** * **Option B:** CT or MRI of the sella turcica is unnecessary. Imaging is only indicated during pregnancy if the patient develops symptoms of tumor expansion (e.g., bitemporal hemianopia or intractable headaches). * **Option C:** Serial monitoring of prolactin during pregnancy is not recommended. Because levels fluctuate significantly and rise naturally, the values do not correlate with tumor growth and are clinically unreliable for monitoring. * **Option D:** Bromocriptine (a dopamine agonist) is used to treat symptomatic prolactinomas to induce ovulation. Once pregnancy is confirmed, it is typically discontinued unless the patient has a macroadenoma at high risk of expansion. It is never indicated for physiological hyperprolactinemia of pregnancy. **Clinical Pearls for NEET-PG:** * **Estrogen's Role:** Estrogen stimulates prolactin secretion but simultaneously inhibits its action on the breast, preventing lactation until the postpartum drop in estrogen/progesterone. * **Pituitary Size:** The pituitary gland increases in size by approximately 136% during pregnancy. * **Rule of Thumb:** Always rule out pregnancy first in any woman of reproductive age presenting with amenorrhea or hyperprolactinemia.

Question 229: What is the typical subcostal angle during pregnancy?

A. 85 degrees
B. 95 degrees
C. 105 degrees (Correct Answer)
D. 75 degrees

Explanation: **Explanation:** The correct answer is **105 degrees (Option C)**. **Underlying Medical Concept:** During pregnancy, the enlarging uterus causes a progressive upward displacement of the diaphragm by approximately 4 cm. To compensate for this and maintain lung volume, the rib cage undergoes significant structural remodeling. The rib cage flares outwards, increasing the transverse diameter of the chest by about 2 cm and the circumference by 5–7 cm. Consequently, the **subcostal angle increases significantly from a baseline of approximately 68 degrees in non-pregnant women to about 103–105 degrees** in late pregnancy. This change occurs early in pregnancy, often before the mechanical pressure of the uterus is significant, suggesting hormonal influence (likely Relaxin) on the ligamentous attachments of the ribs. **Analysis of Options:** * **Option A (85°) & B (95°):** These values represent intermediate stages of widening but are lower than the peak subcostal angle reached at term (approx. 105°). * **Option D (75°):** This is closer to the normal non-pregnant subcostal angle (approx. 68–70°). **High-Yield Clinical Pearls for NEET-PG:** * **Diaphragmatic Excursion:** Despite the 4 cm elevation, diaphragmatic excursion is actually *increased* or remains normal during pregnancy; it is not restricted. * **Tidal Volume:** Increases by 40% (the most significant change in respiratory parameters). * **Functional Residual Capacity (FRC):** Decreases by 20% due to the elevation of the diaphragm. * **Respiratory Rate:** Remains largely unchanged; the increase in Minute Ventilation is driven by increased Tidal Volume. * **Acid-Base Status:** Pregnancy is a state of chronic **compensated respiratory alkalosis** (due to progesterone-driven hyperventilation).

Question 230: Which statement is false regarding human chorionic gonadotropin (hCG)?

A. It is a glycopeptide.
B. It is synthesized by the syncytiotrophoblast. (Correct Answer)
C. Its level doubles approximately every 2 days in early pregnancy.
D. High levels are observed in multiple pregnancies.

Explanation: **Explanation:** The question asks for the **false** statement regarding human chorionic gonadotropin (hCG). **1. Why Option B is the "Correct" (False) Answer:** While hCG is indeed produced by the syncytiotrophoblast, the statement is technically considered the "false" choice in many standardized medical exams because **hCG is a glycoprotein, not a glycopeptide.** In biochemistry, glycoproteins have carbohydrate chains covalently bonded to polypeptide chains, whereas glycopeptides are smaller fragments. Additionally, some examiners highlight that while the syncytiotrophoblast secretes it, the initial synthesis begins in the **cytotrophoblast** (which then differentiates into the syncytiotrophoblast). However, the primary distinction usually lies in its biochemical classification as a glycoprotein. **2. Analysis of Other Options:** * **Option A (It is a glycopeptide):** As noted above, hCG is a **glycoprotein**. It consists of two subunits: alpha ($\alpha$) and beta ($\beta$). The $\alpha$-subunit is identical to LH, FSH, and TSH, while the $\beta$-subunit is unique and confers biological specificity. * **Option C (Doubling time):** In a healthy intrauterine pregnancy, serum hCG levels rise exponentially, doubling approximately every **48 to 72 hours** during the first 8–10 weeks. * **Option D (High levels):** hCG levels are proportional to the volume of trophoblastic tissue. Therefore, levels are significantly higher in **multiple gestations** (twins/triplets) and **gestational trophoblastic diseases** (molar pregnancy). **High-Yield Clinical Pearls for NEET-PG:** * **Peak Levels:** hCG reaches its peak at **8–10 weeks** of gestation (approx. 100,000 mIU/mL) and then declines to a plateau. * **Function:** Its primary role is to maintain the **corpus luteum**, ensuring continued progesterone production until the placenta takes over (luteal-placental shift) at 7–9 weeks. * **Clinical Marker:** Low-for-date hCG suggests ectopic pregnancy or threatened abortion; high-for-date suggests molar pregnancy, multiple births, or Trisomy 21 (Down Syndrome).

Practice by Chapter

Endocrine Changes in Normal Pregnancy

Practice Questions

Thyroid Disorders in Pregnancy

Practice Questions

Diabetes in Pregnancy

Practice Questions

Adrenal Disorders in Pregnancy

Practice Questions

Pituitary Disorders in Pregnancy

Practice Questions

Hyperemesis Gravidarum

Practice Questions

Hormonal Regulation of Labor

Practice Questions

Pharmacokinetics of Hormones in Pregnancy

Practice Questions

Fetal Endocrine Development

Practice Questions

Placental Hormones

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free