Endocrinology of Pregnancy — MCQs

A 20-year-old female presents with primary amenorrhea. She has no significant medical history and is not on any medications. Examination reveals a tall female with long extremities, normal-sized breasts with pale areolas, and sparse axillary hair. Pelvic examination shows scant pubic hair and a short, blind-ended vaginal pouch. What is the most appropriate next step in management?

Q166Medium

During the first trimester of pregnancy, the risk of fetal malformation in a pregnant woman with insulin-dependent diabetes is best predicted by:

Q167Medium

A 30-year-old G3P2 obese woman at 26 weeks' gestation with no significant past medical history states that diabetes runs in her family. Her other pregnancies were uncomplicated. The results of a 3-hour glucose tolerance test show the following glucose levels: fasting: 90 mg/dL, 1 hour: 195 mg/dL, 2 hours: 155 mg/dL, 3 hours: 145 mg/dL. As a result, she is diagnosed with gestational diabetes. She is counselled to start diet modification and exercise to control her glycemic levels. 3 weeks after her diagnosis, she presents her values: Fasting: 95 mg/dL, 1 hr postprandial: 185 mg/dL. What is the best management?

Q168Medium

All of the following are true about human chorionic gonadotrophin EXCEPT:

Q169Easy

What is the primary treatment for red degeneration of a fibroid during pregnancy?

Q170Easy

A pregnant woman at 8 weeks gestation presents with a random blood glucose level of 177 mg/dL. What is the recommended treatment?

Endocrinology of Pregnancy Indian Medical PG Practice Questions and MCQs

Question 161: In normal pregnancy, which of the following characteristics of the vagina is NOT seen?

A. More Acidic pH
B. Increased number of Lactobacilli
C. Increased Glycogen content
D. Increased number of pathogenic bacteria (Correct Answer)

Explanation: **Explanation:** In a normal pregnancy, the vaginal environment undergoes significant physiological changes driven primarily by high levels of **estrogen**. These changes are protective in nature, designed to prevent ascending infections that could jeopardize the pregnancy. **Why Option D is correct:** Normal pregnancy is characterized by a **decrease** in the diversity of vaginal flora and a reduction in the prevalence of pathogenic bacteria (such as those causing Bacterial Vaginosis). The high-estrogen state promotes a stable environment dominated by *Lactobacillus* species, which actively inhibit the overgrowth of pathogens. Therefore, an "increased number of pathogenic bacteria" is a pathological finding, not a normal characteristic of pregnancy. **Analysis of Incorrect Options:** * **Option C (Increased Glycogen):** Estrogen causes hypertrophy of the vaginal epithelium, leading to increased deposition of glycogen in the squamous cells. * **Option B (Increased Lactobacilli):** *Lactobacillus acidophilus* (Döderlein’s bacilli) thrive on the abundant glycogen. They ferment glycogen into lactic acid. * **Option A (More Acidic pH):** Due to the increased production of lactic acid by Lactobacilli, the vaginal pH becomes more acidic (ranging from **3.5 to 6.0**). This acidity is a primary defense mechanism against infection. **High-Yield NEET-PG Pearls:** * **Chadwick’s Sign:** The bluish discoloration of the vagina due to increased vascularity (venous congestion) during pregnancy. * **Osiander’s Sign:** Increased pulsation felt through the lateral vaginal fornices due to increased vascularity. * **Cytology:** A vaginal smear in pregnancy typically shows a high **"Progesterone effect,"** characterized by an abundance of **Navicular cells** (boat-shaped epithelial cells filled with glycogen).

Question 162: In which of the following conditions do the ovaries function normally?

A. Turner's syndrome
B. Rokitansky-Kuster-Hauser syndrome (Correct Answer)
C. Androgen insensitivity syndrome
D. Swyer's syndrome

Explanation: **Explanation:** The core concept tested here is the embryological origin of the female reproductive system. The ovaries develop from the **primitive germ cells** and the **genital ridge**, whereas the uterus, cervix, and upper vagina develop from the **Müllerian (paramesonephric) ducts**. **1. Why Rokitansky-Kuster-Hauser (MRKH) Syndrome is correct:** MRKH syndrome is characterized by **Müllerian agenesis**. Since the ovaries have a different embryological origin than the Müllerian ducts, they are anatomically and functionally normal. Patients have a 46,XX karyotype, normal secondary sexual characteristics (due to intact estrogen production), and normal ovulation, but present with primary amenorrhea due to the absence of the uterus and upper vagina. **2. Why the other options are incorrect:** * **Turner’s Syndrome (45,XO):** Accelerated follicular atresia leads to **streak ovaries** and primary ovarian failure. Estrogen levels are low, and FSH is elevated. * **Androgen Insensitivity Syndrome (46,XY):** These individuals have **testes** (usually undescended) rather than ovaries. The phenotype is female due to end-organ resistance to androgens, but there is no ovarian function. * **Swyer’s Syndrome (46,XY Pure Gonadal Dysgenesis):** Due to a failure in testicular development, the gonads remain as **non-functional streaks**. There is no ovarian tissue. **High-Yield Clinical Pearls for NEET-PG:** * **MRKH vs. AIS:** Both present with primary amenorrhea and a blind vaginal pouch. Differentiate by **axillary/pubic hair** (present in MRKH, absent/scant in AIS) and **karyotype**. * **Hormonal Profile in MRKH:** FSH, LH, and Estrogen levels are all **normal** because the hypothalamic-pituitary-ovarian axis is intact. * **Associated Anomalies:** In MRKH, always screen for **renal anomalies** (40% cases, e.g., renal agenesis) and skeletal issues (RIPSA association).

Question 163: Normal stature with minimal or absent pubertal development may be seen in which of the following conditions?

A. Testicular feminization
B. Kallmann syndrome (Correct Answer)
C. Pure gonadal dysgenesis
D. Turner syndrome

Explanation: **Explanation:** The key to this question lies in the combination of **normal stature** and **absent pubertal development** (primary amenorrhea). **Kallmann Syndrome (Correct Answer):** This is a form of **hypogonadotropic hypogonadism** caused by the failure of GnRH-secreting neurons to migrate from the olfactory placode to the hypothalamus. * **Puberty:** Absent or minimal due to low FSH/LH and subsequent low estrogen. * **Stature:** Stature is **normal or even tall**. Because estrogen is required for the closure of epiphyseal plates, its absence leads to delayed bone age and continued long bone growth. * **Classic Sign:** Anosmia or hyposmia. **Why the other options are incorrect:** * **Testicular Feminization (AIS):** These patients have **normal pubertal development** (specifically breast development, Tanner Stage IV-V) due to the peripheral conversion of testosterone to estrogen, though they lack axillary/pubic hair. * **Pure Gonadal Dysgenesis (46,XX or 46,XY Swyer Syndrome):** While these patients have primary amenorrhea and normal/tall stature, Kallmann syndrome is a more classic association with "minimal development" in a generalized endocrine context. However, the distinguishing feature for Kallmann is the hypothalamic origin and associated anosmia. * **Turner Syndrome (45,XO):** This is characterized by **short stature** (due to SHOX gene haploinsufficiency) and streak ovaries. It does not present with normal stature. **High-Yield Clinical Pearls for NEET-PG:** * **Kallmann Syndrome:** Hypogonadotropic hypogonadism + Anosmia + Normal/Tall stature. * **Turner Syndrome:** Hypergonadotropic hypogonadism + Short stature + Webbed neck + Bicuspid aortic valve. * **Swyer Syndrome:** 46,XY with streak ovaries; requires gonadectomy due to high risk of gonadoblastoma. * **Bone Age:** In Kallmann and Turner syndromes, bone age is typically delayed compared to chronological age.

Question 164: Which of the following conditions is specifically associated with pregnancy?

A. Type I diabetes
B. Type II diabetes
C. Gestational diabetes (Correct Answer)
D. Juvenile diabetes

Explanation: **Explanation:** **Gestational Diabetes Mellitus (GDM)** is the correct answer because it is defined as carbohydrate intolerance of variable severity with onset or first recognition during pregnancy. Unlike other forms of diabetes, GDM is specifically driven by the physiological changes of pregnancy. **The Underlying Medical Concept:** Pregnancy is a "diabetogenic state." During the second and third trimesters, the placenta secretes **Human Placental Lactogen (hPL)**, cortisol, 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. **Analysis of Incorrect Options:** * **Type I & Type II Diabetes (A & B):** These are "Pre-gestational" or "Pregestational" diabetes. They exist before conception and are not caused by the pregnancy itself, though pregnancy can complicate their management. * **Juvenile Diabetes (D):** This is an older term for Type I Diabetes, typically characterized by absolute insulin deficiency due to autoimmune destruction of beta cells, independent of pregnancy status. **NEET-PG High-Yield Pearls:** * **Screening:** In India (DIPSI guidelines), a single-step 75g Oral Glucose Tolerance Test (OGTT) is used. A 2-hour plasma glucose value **≥140 mg/dL** is diagnostic of GDM. * **Best Time to Screen:** Usually between **24–28 weeks** of gestation, when anti-insulin hormones peak. * **Complications:** The most common fetal complication is **macrosomia** (due to fetal hyperinsulinemia), while the most common neonatal complication is **hypoglycemia**. * **Drug of Choice:** Insulin remains the gold standard, though Metformin is increasingly used in specific clinical scenarios.

Question 165: A 20-year-old female presents with primary amenorrhea. She has no significant medical history and is not on any medications. Examination reveals a tall female with long extremities, normal-sized breasts with pale areolas, and sparse axillary hair. Pelvic examination shows scant pubic hair and a short, blind-ended vaginal pouch. What is the most appropriate next step in management?

A. No intervention is necessary
B. Bilateral gonadectomy (Correct Answer)
C. Unilateral gonadectomy
D. Bilateral mastectomy

Explanation: **Explanation:** The clinical presentation is classic for **Androgen Insensitivity Syndrome (AIS)**, formerly known as Testicular Feminization Syndrome. The key features include a 46,XY genotype with a female phenotype, tall stature, primary amenorrhea, normal breast development (due to peripheral conversion of testosterone to estrogen), but **sparse/absent axillary and pubic hair** (due to end-organ resistance to androgens). The presence of a short, blind-ended vagina and absence of a uterus (due to Anti-Müllerian Hormone production by the testes) confirms the diagnosis. **Why Bilateral Gonadectomy is correct:** In AIS, the undescended testes (gonads) are usually located in the abdomen or inguinal canal. These gonads carry a significant risk of malignant transformation into **Gonadoblastoma** or **Dysgerminoma**. While the risk is low before puberty, it increases to approximately 2-5% in early adulthood and rises significantly thereafter. Therefore, **bilateral gonadectomy** is recommended **after puberty** to allow for natural completion of breast development and bone growth through endogenous estrogen conversion. **Why other options are incorrect:** * **Option A:** No intervention is dangerous due to the high risk of malignancy in the intra-abdominal gonads. * **Option C:** Unilateral gonadectomy is insufficient as both gonads carry the risk of malignancy and produce androgens that the body cannot utilize. * **Option D:** Mastectomy is not indicated; breast development is a desired secondary sexual characteristic in these patients, who identify as female. **High-Yield Clinical Pearls for NEET-PG:** * **Karyotype in AIS:** 46, XY. * **Testosterone levels:** Elevated to male ranges (but ineffective at receptors). * **Differentiating AIS from MRKH:** In MRKH (Müllerian Agenesis), the karyotype is 45,XX, and pubic/axillary hair is **normal** because androgen receptors are functional. * **Timing of Surgery:** In AIS, gonadectomy is delayed until after puberty (age 16-18). In Swyer Syndrome (46,XY Pure Gonadal Dysgenesis), gonadectomy is performed **immediately upon diagnosis** due to a much higher and earlier risk of malignancy.

Question 166: During the first trimester of pregnancy, the risk of fetal malformation in a pregnant woman with insulin-dependent diabetes is best predicted by:

A. Blood sugar values
B. Glycosylated hemoglobin levels (Correct Answer)
C. Serum alpha-fetoprotein levels
D. Serum unconjugated estriol levels

Explanation: **Explanation:** **1. Why Glycosylated Hemoglobin (HbA1c) is the Correct Answer:** The risk of congenital malformations in diabetic pregnancies is directly proportional to the degree of glycemic control during the period of **organogenesis** (the first 8 weeks post-conception). HbA1c reflects the average blood glucose levels over the preceding 8–12 weeks. High periconceptional HbA1c levels (especially >8.5–10%) are strongly associated with an increased risk of major anomalies, such as **Sacral Agenesis** (most specific) and **Congenital Heart Defects** (most common). Therefore, it serves as the best retrospective predictor of the intrauterine environment during the critical window of development. **2. Why Other Options are Incorrect:** * **A. Blood sugar values:** These provide a "snapshot" of glucose levels at a single point in time. They fluctuate daily and do not provide a reliable long-term record of control during the organogenesis period. * **C. Serum alpha-fetoprotein (MSAFP):** This is a screening tool used in the **second trimester** (15–20 weeks) to detect neural tube defects or aneuploidies; it does not predict the risk of malformation during the first trimester. * **D. Serum unconjugated estriol:** This is a component of the Triple/Quadruple marker screen used in the second trimester to assess fetal well-being and chromosomal risks, not early malformation risk. **3. NEET-PG High-Yield Pearls:** * **Most common malformation:** Ventricular Septal Defect (VSD) / Transposition of Great Arteries (TGA). * **Most specific malformation:** Caudal Regression Syndrome (Sacral Agenesis). * **Target HbA1c:** Ideally, HbA1c should be **<6.5%** before conception to minimize the risk of malformations to that of the general population. * **Diabetic Embryopathy:** Refers to malformations occurring in the first trimester due to pre-gestational diabetes (Type 1 or 2).

Question 167: A 30-year-old G3P2 obese woman at 26 weeks' gestation with no significant past medical history states that diabetes runs in her family. Her other pregnancies were uncomplicated. The results of a 3-hour glucose tolerance test show the following glucose levels: fasting: 90 mg/dL, 1 hour: 195 mg/dL, 2 hours: 155 mg/dL, 3 hours: 145 mg/dL. As a result, she is diagnosed with gestational diabetes. She is counselled to start diet modification and exercise to control her glycemic levels. 3 weeks after her diagnosis, she presents her values: Fasting: 95 mg/dL, 1 hr postprandial: 185 mg/dL. What is the best management?

A. Continue diet modification
B. Start insulin (Correct Answer)
C. Repeat GTT
D. Start metformin

Explanation: **Explanation:** The patient has been diagnosed with **Gestational Diabetes Mellitus (GDM)** based on her 3-hour Glucose Tolerance Test (GTT) results (exceeding thresholds for 1-hour and 2-hour values). The primary goal in GDM management is to maintain euglycemia to prevent maternal and fetal complications. **1. Why "Start Insulin" is correct:** The first-line management for GDM is Medical Nutrition Therapy (MNT) and exercise for 1–2 weeks. However, if glycemic targets are not met, pharmacological intervention is mandatory. The target values (per ACOG/ADA) are: * **Fasting:** <95 mg/dL * **1-hour postprandial:** <140 mg/dL * **2-hour postprandial:** <120 mg/dL In this case, despite 3 weeks of diet modification, her 1-hour postprandial value is **185 mg/dL** (well above the <140 mg/dL limit). **Insulin** remains the gold standard and first-line pharmacological treatment for GDM as it does not cross the placenta and provides precise glycemic control. **2. Why other options are incorrect:** * **A. Continue diet modification:** Diet has already failed to achieve targets after 3 weeks. Delaying treatment increases the risk of macrosomia and preeclampsia. * **C. Repeat GTT:** Once GDM is diagnosed, GTT is not repeated during pregnancy; management shifts to monitoring capillary blood glucose. * **D. Start metformin:** While used in some guidelines, insulin is preferred in NEET-PG contexts as the first-line agent when MNT fails. Metformin crosses the placenta. **High-Yield Clinical Pearls for NEET-PG:** * **Screening:** Best done at **24–28 weeks** gestation. * **DIPSI Criteria:** A single-step test using 75g glucose; a 2-hour value **≥140 mg/dL** is diagnostic. * **Most common fetal complication:** Macrosomia (due to fetal hyperinsulinemia). * **Postpartum:** Patients with GDM should be screened for Type 2 DM **6–12 weeks postpartum** using a 75g OGTT.

Question 168: All of the following are true about human chorionic gonadotrophin EXCEPT:

A. It is a glycosylated peptide hormone.
B. It is detected in serum 7-9 days after the LH surge.
C. hCG promotes apoptosis in nontrophoblastic neoplasia. (Correct Answer)
D. Elevated hCG levels are seen in Down syndrome.

Explanation: **Explanation:** Human Chorionic Gonadotrophin (hCG) is a glycoprotein hormone produced by the syncytiotrophoblast. Understanding its physiological and pathological roles is crucial for NEET-PG. **Why Option C is the Correct Answer (The False Statement):** hCG does not promote apoptosis; rather, it is associated with **anti-apoptotic** properties. In nontrophoblastic neoplasias (such as certain bladder, lung, or cervical cancers), the production of the β-subunit of hCG is often linked to increased tumor aggressiveness, cell survival, and resistance to therapy by inhibiting apoptosis. **Analysis of Other Options:** * **Option A:** hCG is indeed a **glycosylated peptide (glycoprotein)**. It consists of an $\alpha$-subunit (identical to LH, FSH, and TSH) and a $\beta$-subunit (unique to hCG, providing biological specificity). * **Option B:** hCG is produced following implantation. Implantation typically occurs 6–10 days after ovulation (LH surge). Therefore, hCG can be detected in maternal serum as early as **7–9 days after the LH surge** (or 8–11 days after conception). * **Option D:** In the second-trimester quadruple screen for **Down Syndrome (Trisomy 21)**, maternal serum **hCG and Inhibin-A levels are characteristically elevated**, while AFP and uE3 are decreased. **NEET-PG High-Yield Pearls:** * **Doubling Time:** In early normal pregnancy, hCG levels double every 48–72 hours. * **Peak Levels:** hCG reaches its peak concentration at **8–10 weeks** of gestation (approx. 100,000 mIU/mL) and then declines to a plateau. * **Biological Function:** Its primary role is to maintain the **corpus luteum**, ensuring continued progesterone production until the luteal-placental shift occurs (around 7–9 weeks). * **Very High hCG:** Seen in molar pregnancy, multiple gestations, and Down syndrome. * **Low hCG for Gestational Age:** Seen in ectopic pregnancy or impending abortion.

Question 169: What is the primary treatment for red degeneration of a fibroid during pregnancy?

A. Analgesics (Correct Answer)
B. Laparotomy
C. Termination of pregnancy
D. Removal at cesarean section

Explanation: **Explanation:** **Red degeneration (necrobiosis)** is the most common complication of uterine fibroids during pregnancy, typically occurring in the second trimester. It is caused by rapid growth of the fibroid due to high estrogen levels, leading to the tumor outgrowing its blood supply. This results in venous thrombosis, infarction, and hemorrhage within the fibroid. 1. **Why Analgesics are correct:** Red degeneration is a **self-limiting condition**. The primary clinical presentation is acute, severe abdominal pain, localized tenderness, and low-grade fever. The management is strictly **conservative**. Bed rest, hydration, and **analgesics** (specifically NSAIDs like Ibuprofen or Paracetamol) are the mainstays of treatment. Symptoms usually subside within 4–7 days. 2. **Why other options are incorrect:** * **Laparotomy/Myomectomy:** Surgical intervention during pregnancy is contraindicated due to the high risk of uncontrollable hemorrhage and miscarriage. * **Termination of pregnancy:** This is unnecessary as the condition does not pose a direct threat to maternal life and is self-limiting. * **Removal at cesarean section:** Myomectomy during C-section is generally avoided because the uterus is highly vascular, leading to a significant risk of massive hemorrhage. **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Characterized by a "beefy red" appearance and a fishy odor due to the presence of peripheral sulfonamides. * **MRI Finding:** Often shows a characteristic peripheral rim of high signal intensity on T1-weighted images. * **Drug of Choice:** While Paracetamol is first-line, short-term NSAIDs can be used before 32 weeks (avoid late in pregnancy due to risk of premature closure of the ductus arteriosus).

Question 170: A pregnant woman at 8 weeks gestation presents with a random blood glucose level of 177 mg/dL. What is the recommended treatment?

A. Phenformin
B. Sulfonylurea
C. Insulin (Correct Answer)
D. Glipizide

Explanation: **Explanation:** The patient presents with a random blood glucose of 177 mg/dL at 8 weeks gestation. According to the **DIPSI (Diabetes in Pregnancy Study Group India)** and **ADA guidelines**, any pregnant woman diagnosed with diabetes (either pre-gestational or overt diabetes detected in the first trimester) should be managed primarily with Medical Nutrition Therapy (MNT). However, if glycemic targets are not met or if the initial presentation warrants pharmacological intervention, **Insulin** is the gold standard treatment. **Why Insulin is the Correct Choice:** 1. **Safety:** Insulin does not cross the placenta, making it the safest option for the fetus. 2. **Efficacy:** It provides the most precise glycemic control, reducing the risk of congenital malformations (especially important in the first trimester) and macrosomia. 3. **Standard of Care:** While Metformin is sometimes used in later pregnancy, Insulin remains the first-line drug of choice for overt diabetes in pregnancy. **Why Other Options are Incorrect:** * **Phenformin (A):** This is a biguanide that was withdrawn globally due to the high risk of fatal lactic acidosis. It is never used in modern practice. * **Sulfonylureas (B & D):** Most older-generation sulfonylureas (like Chlorpropamide) and even second-generation ones like **Glipizide** are generally avoided in the first trimester due to concerns regarding potential teratogenicity and the risk of prolonged neonatal hypoglycemia. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** A fasting glucose ≥126 mg/dL or a random/75g OGTT (2-hr) ≥200 mg/dL in early pregnancy signifies **Overt/Pre-gestational Diabetes**. * **Target HbA1c:** Ideally <6.0% to minimize the risk of sacral agenesis (the most specific malformation) and congenital heart defects. * **Drug of Choice:** Insulin is the first-line treatment. If an oral hypoglycemic agent is used (usually after the first trimester), **Metformin** is preferred over Glyburide.

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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