Endocrinology of Pregnancy Practice Questions

Q: Precocious sexual development is characterized by breast and pubic hair growth before what age?

8 years. **Explanation:** Precocious puberty is defined as the onset of secondary sexual characteristics (thelarche or pubarche) at an age that is more than 2.5 standard deviations below the mean for the population. In females, the established clinical cutoff for precocious development is **8 years**. **1. Why 8 years is correct:** In girls, the first sign of puberty is typically thelarche (breast budding), followed by pubarche (pubic hair) and menarche. If these changes occur before the age of 8, it indicates premature activation of the Hypothalamic-Pituitary-Gonadal (HPG) axis (Central Precocious Puberty) or autonomous peripheral production of sex steroids (Peripheral Precocious Puberty). **2. Why the other options are incorrect:** * **9 years:** This is the age cutoff for precocious puberty in **males** (development of secondary sexual characteristics before age 9). * **10 and 11 years:** These ages fall within the normal physiological range for the onset of puberty in females. The average age for thelarche is approximately 10–10.5 years, and menarche typically occurs around 12–12.5 years. **NEET-PG High-Yield Pearls:** * **Sequence of Puberty (Girls):** Thelarche (Breast) → Pubarche (Hair) → Growth Spurt → Menarche (Bleeding). Remember the mnemonic: **"T-P-G-M"**. * **Central vs. Peripheral:** Central precocious puberty is "GnRH-dependent" and is most commonly **idiopathic** in girls. Peripheral is "GnRH-independent" (e.g., McCune-Albright Syndrome, Granulosa cell tumor). * **Investigation of Choice:** Bone age assessment (X-ray of the left hand/wrist) is the initial step to evaluate skeletal maturation. * **Treatment:** GnRH analogues (e.g., Leuprolide) are the gold standard for Central Precocious Puberty to prevent premature epiphyseal fusion and short adult stature.

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 NOT a normal physiological finding in pregnancy?

Diastolic murmur. In pregnancy, the cardiovascular system undergoes significant remodeling to meet increased metabolic demands. Understanding the distinction between physiological adaptations and pathological signs is crucial for NEET-PG. ### **Why Diastolic Murmur is the Correct Answer** A **diastolic murmur is always pathological** in pregnancy. While pregnancy is a hyperdynamic state characterized by increased cardiac output (up to 50%) and stroke volume, these changes typically manifest as systolic flow murmurs. A diastolic murmur suggests underlying structural heart disease, such as mitral stenosis or aortic regurgitation, and warrants immediate investigation with an echocardiogram. ### **Analysis of Incorrect Options** * **A. Dyspnea:** Physiological dyspnea occurs in about 75% of pregnant women. It is primarily due to increased progesterone levels, which increase the sensitivity of the respiratory center to $CO_2$, leading to "hyperventilation of pregnancy." * **B. Systolic Murmur:** Up to 90% of pregnant women develop a **Grade I or II midsystolic flow murmur**. This is caused by decreased blood viscosity (hemodilution) and increased flow velocity across the pulmonary and aortic valves. * **D. Exercise Intolerance:** This is a normal finding due to the increased mechanical load of the gravid uterus, increased basal metabolic rate, and the physiological shift in the center of gravity. ### **High-Yield Clinical Pearls for NEET-PG** * **Heart Sounds:** An exaggerated S1 split and a physiological S3 are common/normal in pregnancy. * **ECG Changes:** Left axis deviation is common as the diaphragm elevates and displaces the heart upward and to the left. * **Blood Pressure:** Diastolic BP decreases in the first and second trimesters (nadir at 24 weeks) due to decreased Systemic Vascular Resistance (SVR). * **Rule of Thumb:** Systolic = Flow (Normal); Diastolic = Disease (Abnormal).

Q: All of the following drugs can be given to a mother with lupus after 35th week of gestation, except?

Methotrexate. **Explanation:** The correct answer is **Methotrexate (Option B)**. Methotrexate is a potent folic acid antagonist and is strictly **contraindicated** throughout pregnancy (FDA Category X). While its teratogenic effects (fetal hydantoin-like syndrome, cranial anomalies) are most concerning in the first trimester, it remains contraindicated in the third trimester due to its potential for neonatal myelosuppression and hepatotoxicity. **Analysis of Options:** * **Chloroquine (Option A):** Antimalarials (Hydroxychloroquine/Chloroquine) are considered the cornerstone of SLE management in pregnancy. They are safe and essential to prevent lupus flares and reduce the risk of neonatal heart block. * **Sulphadiazine / Sulphasalazine (Option C):** These are considered safe in pregnancy. While sulfonamides are generally avoided near term due to the theoretical risk of neonatal kernicterus (by displacing bilirubin from albumin), Sulphasalazine is frequently used in stable autoimmune patients and is not strictly contraindicated like Methotrexate. * **Prednisolone (Option D):** This is the steroid of choice for maternal indications (like SLE flares). It is metabolized by the placental enzyme **11-beta-hydroxysteroid dehydrogenase**, ensuring that less than 10% of the drug reaches the fetus, thus minimizing fetal side effects. **NEET-PG High-Yield Pearls:** * **Drug of Choice for SLE in Pregnancy:** Hydroxychloroquine (reduces flares). * **Steroids in Pregnancy:** Prednisolone is used for maternal SLE; **Betamethasone/Dexamethasone** are used for fetal lung maturity (as they cross the placenta). * **Lupus & Neonatal Heart Block:** Associated with Anti-Ro (SSA) and Anti-La (SSB) antibodies. * **Safe Immunosuppressants in Pregnancy:** Azathioprine, Cyclosporine, and Tacrolimus. * **Contraindicated in SLE Pregnancy:** Methotrexate, Mycophenolate Mofetil (MMF), and Cyclophosphamide.

Q: A pregnant female is taking carbimazole. Which of the following is NOT seen in the neonate?

Cleft lip/palate. **Explanation:** The question tests your knowledge of the teratogenic effects of anti-thyroid drugs. Carbimazole (a prodrug of Methimazole) is associated with a specific pattern of malformations known as **Methimazole Embryopathy**. **Why Cleft Lip/Palate is the correct answer:** Cleft lip and palate are **not** part of the classic Methimazole Embryopathy. While they are common congenital anomalies, they are not specifically linked to carbimazole exposure. In contrast, Propylthiouracil (PTU) is generally preferred in the first trimester because it has a lower risk of causing the specific structural defects associated with carbimazole. **Analysis of Incorrect Options:** * **Choanal Atresia (A) & Scalp Defects (B):** These are hallmark features of Methimazole Embryopathy. Scalp defects specifically refer to **Aplasia Cutis Congenita** (localized absence of skin, usually on the scalp). Other features include esophageal atresia and facial dysmorphism. * **Fetal Goiter (D):** Both Carbimazole and PTU cross the placenta and can inhibit the fetal thyroid gland. This leads to an increase in fetal TSH, resulting in fetal goiter and potential hypothyroidism. **High-Yield NEET-PG Pearls:** 1. **Drug of Choice:** PTU is preferred in the **1st trimester** (due to carbimazole teratogenicity). Carbimazole/Methimazole is preferred in the **2nd and 3rd trimesters** (due to PTU-induced maternal hepatotoxicity). 2. **Aplasia Cutis:** If you see "scalp defect" and "anti-thyroid drug" in a clinical stem, think Carbimazole/Methimazole. 3. **Mechanism:** Both drugs act by inhibiting the enzyme **Thyroid Peroxidase**, blocking the organification of iodine.

Q: Insulin resistance in pregnancy is due to which of the following hormones?

All of the above. **Explanation:** Pregnancy is a naturally "diabetogenic state" characterized by progressive insulin resistance, primarily during the second and third trimesters. This physiological adaptation ensures a continuous supply of glucose to the fetus by decreasing maternal glucose utilization. **Why "All of the Above" is correct:** Insulin resistance is a multifactorial process driven by several placental hormones: * **Human Placental Lactogen (hPL):** Also known as Human Chorionic Somatomammotropin (hCS), this is the **most potent** antagonist to insulin. It promotes lipolysis and inhibits peripheral glucose uptake. * **Progesterone and Estrogen:** These steroid hormones interfere with the insulin signaling pathway at the post-receptor level, further decreasing insulin sensitivity. * **Other factors:** Placental growth hormone, cortisol, and inflammatory cytokines (TNF-alpha) also contribute to this resistance. **Analysis of Options:** * **Option A & B:** While Estrogen and Progesterone contribute significantly, selecting either one alone would be incomplete, as they work synergistically with hPL. * **Option C:** hPL is the primary driver, but the presence of other diabetogenic hormones makes "All of the above" the most accurate clinical answer. **NEET-PG High-Yield Pearls:** 1. **Peak Resistance:** Insulin resistance peaks in the **third trimester** (coinciding with maximum placental mass). 2. **The "Diabetogenic" Hormone:** If the question asks for the *single most important* hormone responsible, the answer is **hPL**. 3. **Fetal Fuel:** Glucose crosses the placenta via **facilitated diffusion (GLUT-1)**, whereas insulin does **not** cross the placenta. 4. **Clinical Correlation:** Gestational Diabetes Mellitus (GDM) occurs when the maternal pancreas cannot increase insulin secretion (usually 2–3 fold) to overcome this hormonal resistance.

Question 1

A 16-year-old girl has not yet reached menarche. She has normal secondary sex characteristics, and visual inspection of her external genitalia is unremarkable. The patient is given progesterone and has withdrawal bleeding a few days later. This patient most likely has:

Accepted Answer

A constitutional delay in puberty

Answer

Primary ovarian disease

Answer

Turner syndrome

Answer

A destructive hypothalamic disorder

Question 2

Precocious sexual development is characterized by breast and pubic hair growth before what age?

Accepted Answer

8 years

Answer

9 years

Answer

10 years

Answer

11 years

Question 3

The risk of thromboembolism increases in pregnancy because:

Accepted Answer

Increased hepatic production of clotting factors

Answer

Viscosity of blood increases

Answer

Increased antithrombin III levels

Answer

Increased progesterone levels

Question 4

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 5

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 6

Which of the following is NOT a normal physiological finding in pregnancy?

Accepted Answer

Diastolic murmur

Answer

Dyspnea

Answer

Systolic murmur

Answer

Exercise intolerance

Question 7

What is the most common effect of congenital adrenal hyperplasia?

Accepted Answer

Female pseudohermaphroditism

Answer

Male pseudohermaphroditism

Answer

True hermaphroditism

Answer

Gonadal dysgenesis

Question 8

All of the following drugs can be given to a mother with lupus after 35th week of gestation, except?

Accepted Answer

Methotrexate

Answer

Chloroquine

Answer

Sulphadiazine / Sulphasalazine

Answer

Prednisolone

Question 9

A pregnant female is taking carbimazole. Which of the following is NOT seen in the neonate?

Accepted Answer

Cleft lip/palate

Answer

Choanal atresia

Answer

Scalp defects

Answer

Fetal goiter

Question 10

Insulin resistance in pregnancy is due to which of the following hormones?

Accepted Answer

All of the above

Answer

Estrogen

Answer

Progesterone

Answer

Human Placental Lactogen (HPL)

Endocrinology of Pregnancy — MCQs

Endocrinology of Pregnancy — MCQs

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