Endocrinology of Pregnancy Practice Questions

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

Glycosylated hemoglobin levels. **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).

Q: 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?

Start insulin. **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.

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

hCG promotes apoptosis in nontrophoblastic neoplasia.. **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.

Q: What are the normal fasting plasma glucose levels during a 75g Glucose Tolerance Test (GTT) in pregnancy?

<92 mg/dL. The correct answer is **B. <92 mg/dL**. ### **Explanation** The diagnosis of Gestational Diabetes Mellitus (GDM) has evolved significantly. According to the **IADPSG (International Association of Diabetes and Pregnancy Study Groups)** and **WHO** criteria, a one-step 75g Oral Glucose Tolerance Test (OGTT) is used. In pregnancy, fasting glucose levels are naturally lower than in non-pregnant individuals due to continuous fetal glucose consumption and increased maternal volume of distribution. The diagnostic thresholds for a 75g OGTT are: * **Fasting:** <92 mg/dL * **1-hour:** <180 mg/dL * **2-hour:** <153 mg/dL * *Note: If any one value is met or exceeded, GDM is diagnosed.* ### **Analysis of Incorrect Options** * **Option A (≤105 mg/dL):** This was the older fasting threshold used in the **NDDG (National Diabetes Data Group)** criteria for the 100g 3-hour OGTT. It is no longer the standard for the 75g test. * **Option C (≤140 mg/dL):** This is the standard threshold for a **1-hour 50g Glucose Challenge Test (GCT)** used in two-step screening. It is not a fasting value. * **Option D (≤120 mg/dL):** This is often the target for **2-hour postprandial** glucose monitoring in managed GDM patients, not a diagnostic fasting threshold. ### **High-Yield Clinical Pearls for NEET-PG** 1. **DIPSI Criteria:** In India, the DIPSI (Diabetes in Pregnancy Study Group India) recommends a single-step 75g GTT regardless of the last meal. A 2-hour value **≥140 mg/dL** is diagnostic of GDM. 2. **Hormonal Basis:** Human Placental Lactogen (hPL) is the primary hormone responsible for insulin resistance in pregnancy, peaking in the third trimester. 3. **Best Time to Screen:** Routine screening is performed between **24–28 weeks** of gestation.

Q: What is the optimal value of glycosylated hemoglobin in a woman with diabetes preconceptionally?

<6.5%. **Explanation:** The goal of preconceptional counseling in diabetic women is to achieve euglycemia before organogenesis begins (which starts around the 3rd to 5th week of gestation). **1. Why <6.5% is correct:** The risk of major congenital malformations (such as sacral agenesis, neural tube defects, and cardiac anomalies) is directly proportional to the maternal HbA1c levels during the first trimester. An **HbA1c <6.5%** is the internationally recognized target (ADA and ACOG guidelines) because it minimizes the risk of embryopathy to a level comparable to the non-diabetic population. Achieving this value ensures that the metabolic environment is stable before the patient conceives. **2. Why other options are incorrect:** * ** 9% is associated with a very high risk (up to 20-25%) of major malformations. In clinical practice, an HbA1c >10% is often considered a relative contraindication to pregnancy until better control is achieved. **High-Yield Clinical Pearls for NEET-PG:** * **Most common malformation:** Cardiac anomalies (specifically Ventricular Septal Defects). * **Most specific malformation:** Caudal Regression Syndrome (Sacral Agenesis). * **HbA1c Target during pregnancy:** Ideally <6.0% (if achievable without significant hypoglycemia). * **Folic Acid:** Diabetic women should take a higher dose (5 mg/day) pre-conceptionally to reduce the risk of Neural Tube Defects.

Q: Which of the following is FALSE regarding hyperemesis gravidarum?

Small heart is an incidental finding.. ### Explanation **Hyperemesis Gravidarum (HG)** is a severe form of nausea and vomiting in pregnancy characterized by dehydration, electrolyte imbalance, and weight loss. **1. Why Option C is the Correct (False) Statement:** The finding of a **"small heart"** on X-ray or autopsy in patients with severe HG is **not an incidental finding**. It is a pathological sign of **brown atrophy of the heart**, resulting from prolonged starvation, severe malnutrition, and chronic dehydration. The heart undergoes atrophy due to the body's catabolic state, where it breaks down its own tissues for energy. **2. Analysis of Other Options:** * **Option A (Allergic basis):** This is a recognized theory. HG is sometimes considered an immunological or allergic reaction to the "foreign" proteins of the chorionic villi or fetal antigens. * **Option B (Hormonal imbalance):** This is the most widely accepted etiology. High levels of **hCG** (especially in molar pregnancies or twins) and **Estrogen** are strongly associated with the severity of vomiting. * **Option D (Wernicke’s encephalopathy):** This is a dreaded complication of HG. Persistent vomiting leads to **Vitamin B1 (Thiamine) deficiency**. The classic triad includes ataxia, ophthalmoplegia, and confusion. **3. High-Yield Clinical Pearls for NEET-PG:** * **Metabolic Profile:** HG typically causes **Metabolic Alkalosis** (due to loss of HCl) with **Hypokalemia** and **Hyponatremia**. * **Ketonuria:** The presence of ketones in urine is a hallmark of HG, indicating starvation. * **Liver Function:** Mild elevation of serum bilirubin and transaminases may occur. * **Management:** The first-line drug is **Pyridoxine (Vit B6) + Doxylamine**. If Wernicke’s is suspected, always give Thiamine **before** IV Dextrose to prevent worsening of neurological symptoms.

Q: Which hormone has the greatest production rate near term in humans, approximately 1 gram per day?

hPL. **Explanation:** The correct answer is **hPL (Human Placental Lactogen)**, also known as Human Chorionic Somatomammotropin (hCS). **1. Why hPL is correct:** hPL is produced by the syncytiotrophoblast of the placenta. Its production is directly proportional to the placental mass. Near term, hPL has the **highest production rate of any known hormone in humans**, reaching approximately **1 gram per day**. Its primary physiological role is to act as an "anti-insulin" agent (diabetogenic effect), increasing maternal insulin resistance to ensure a steady supply of glucose for fetal growth. **2. Why the other options are incorrect:** * **Progesterone (B):** While progesterone levels rise significantly during pregnancy to maintain uterine quiescence, its production rate near term is approximately **250–300 mg per day**, which is significantly less than the 1000 mg (1g) produced by hPL. * **hCG (C):** Human Chorionic Gonadotropin peaks early in pregnancy (around 8–10 weeks) and then declines to a lower plateau. It is measured in International Units (IU), and its mass production is nowhere near the gram level. * **Relaxin (A):** Produced by the corpus luteum and placenta, relaxin is involved in softening the cervix and pelvic ligaments. It circulates in picogram or nanogram concentrations. **3. NEET-PG High-Yield Pearls:** * **hPL** is the most important hormone responsible for the **diabetogenic state** of pregnancy. * It is structurally similar to **Growth Hormone** and **Prolactin**. * Low levels of hPL are associated with **Placental Insufficiency** and Fetal Growth Restriction (FGR). * **Half-life:** hPL has a very short half-life (approx. 15–30 minutes), making it a potential (though now rarely used) marker for placental function.

Question 1

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

Accepted Answer

Glycosylated hemoglobin levels

Answer

Blood sugar values

Answer

Serum alpha-fetoprotein levels

Answer

Serum unconjugated estriol levels

Question 2

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?

Accepted Answer

Start insulin

Answer

Continue diet modification

Answer

Repeat GTT

Answer

Start metformin

Question 3

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

Accepted Answer

hCG promotes apoptosis in nontrophoblastic neoplasia.

Answer

It is a glycosylated peptide hormone.

Answer

It is detected in serum 7-9 days after the LH surge.

Answer

Elevated hCG levels are seen in Down syndrome.

Question 4

Hypothyroidism in pregnancy is least likely associated with which of the following complications?

Accepted Answer

Polyhydramnios

Answer

Recurrent abortions

Answer

Pregnancy induced hypertension (PIH)

Answer

Prematurity

Question 5

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

Accepted Answer

Insulin

Answer

Phenformin

Answer

Sulfonylurea

Answer

Glipizide

Question 6

What are the normal fasting plasma glucose levels during a 75g Glucose Tolerance Test (GTT) in pregnancy?

Accepted Answer

<92 mg/dL

Answer

<=105 mg/dL

Answer

<=140 mg/dL

Answer

<=120 mg/dL

Question 7

What is the optimal value of glycosylated hemoglobin in a woman with diabetes preconceptionally?

Accepted Answer

<6.5%

Answer

<7.5%

Answer

<8.1%

Answer

<9%

Question 8

What is the most common effect of congenital adrenal hyperplasia?

Accepted Answer

Female pseudohermaphroditism

Answer

Male pseudohermaphroditism

Answer

True hermaphroditism

Answer

Gonadal dysgenesis

Question 9

Which of the following is FALSE regarding hyperemesis gravidarum?

Accepted Answer

Small heart is an incidental finding.

Answer

Allergic basis is suggested.

Answer

Hormonal imbalance may be a cause.

Answer

May show manifestations of Wernicke's encephalopathy.

Question 10

Which hormone has the greatest production rate near term in humans, approximately 1 gram per day?

Accepted Answer

hPL

Answer

Relaxin

Answer

Progesterone

Answer

hCG

Endocrinology of Pregnancy — MCQs

Endocrinology of Pregnancy — MCQs

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