Endocrinology of Pregnancy Practice Questions

Q: True about hCG is:

Alpha subunit identical to LH, FSH and TSH. **Explanation:** Human Chorionic Gonadotropin (hCG) is a glycoprotein hormone secreted by the syncytiotrophoblast. Understanding its structure and kinetics is high-yield for NEET-PG. **1. Why Option A is Correct:** hCG is a heterodimer consisting of two subunits: **Alpha (α) and Beta (β)**. The **α-subunit** is identical in amino acid sequence to the α-subunits of Luteinizing Hormone (LH), Follicle-Stimulating Hormone (FSH), and Thyroid-Stimulating Hormone (TSH). Biological specificity is determined solely by the **β-subunit**, which is why pregnancy tests specifically detect the β-hCG fraction to avoid cross-reactivity. **2. Why Other Options are Incorrect:** * **Option B:** hCG does not cause involution; rather, it **rescues and maintains** the corpus luteum, ensuring continued progesterone production until the luteo-placental shift (at 7–10 weeks). * **Option C:** In early pregnancy, hCG levels **double every 48 to 72 hours** (approx. 2 days), not 7–10 days. A slow rise or plateau is often indicative of an ectopic pregnancy or impending miscarriage. * **Option D:** hCG levels peak at **8–11 weeks (60–70 days)** of gestation, reaching approximately 100,000 mIU/mL, before declining to a lower steady state. **Clinical Pearls for NEET-PG:** * **Earliest Detection:** hCG can be detected in maternal serum **8–9 days after fertilization** (around the time of implantation). * **Thyroid Link:** Due to the identical α-subunit and structural similarity to TSH, very high levels of hCG (as seen in Molar pregnancy) can overstimulate the thyroid gland, leading to **gestational hyperthyroidism**. * **Discriminatory Zone:** The level of hCG at which a gestational sac should be visible on TVS is typically **1500–2000 mIU/mL**.

Q: What is the target range for fasting blood sugar in a pregnant diabetic female?

70-100 mg%. In pregnancy, maintaining strict glycemic control is vital to prevent maternal and fetal complications such as macrosomia, polyhydramnios, and neonatal hypoglycemia. **Explanation of the Correct Answer (A):** The target fasting blood sugar (FBS) in pregnancy is lower than in non-pregnant individuals due to the physiological state of "accelerated starvation." The fetus continuously consumes maternal glucose, and there is increased insulin sensitivity in the first trimester, followed by insulin resistance later. According to the **American Diabetes Association (ADA)** and **ACOG** guidelines, the goal for FBS in a pregnant diabetic (GDM or Pre-gestational) is **<95 mg/dL** (often rounded to the **70-100 mg%** range in exams). This range ensures adequate glucose for the fetus while preventing the risks associated with maternal hyperglycemia. **Analysis of Incorrect Options:** * **B (100-130 mg%):** This range is closer to the targets for non-pregnant adults. In pregnancy, these levels are associated with an increased risk of fetal macrosomia. * **C & D (130-190 mg%):** These levels represent significant hyperglycemia. Such high fasting levels are diagnostic of poorly controlled diabetes and significantly increase the risk of congenital anomalies (if in the first trimester) and stillbirth. **High-Yield Clinical Pearls for NEET-PG:** * **Target Postprandial (PP) Levels:** 1-hour PP should be **<140 mg/dL**; 2-hour PP should be **<120 mg/dL**. * **HbA1c Target:** Ideally **<6.0%** to minimize the risk of congenital malformations. * **DIPSI Criteria:** A single-step 75g glucose load is used for screening; a 2-hour value **≥140 mg/dL** is diagnostic of GDM. * **Drug of Choice:** Insulin remains the gold standard, though Metformin is increasingly used in specific clinical scenarios.

Q: What is the main function of beta-human chorionic gonadotropin (β-hCG)?

Maintain the corpus luteum. **Explanation:** The primary and most critical function of **beta-human chorionic gonadotropin (β-hCG)** during early pregnancy is the **maintenance of the corpus luteum**. In a non-pregnant cycle, the corpus luteum degenerates after 14 days, leading to a drop in progesterone and subsequent menstruation. However, once fertilization occurs, the syncytiotrophoblast of the developing blastocyst secretes β-hCG. This hormone acts on the LH receptors of the corpus luteum, "rescuing" it and stimulating it to continue producing **progesterone**. This progesterone is vital for maintaining the endometrial lining and supporting the pregnancy until the placenta takes over steroidogenesis (the luteal-placental shift) at approximately 7–10 weeks of gestation. **Analysis of Incorrect Options:** * **B. Stimulate the decidua:** While progesterone (secreted by the corpus luteum) maintains the decidua, β-hCG does not act directly on it. * **C. Initiate implantation:** Implantation is a complex process involving adhesion molecules (integrins) and cytokines; β-hCG is produced *after* the initial stages of implantation have begun. * **D. Initiate breast growth:** Breast changes in pregnancy are primarily driven by estrogen, progesterone, and human placental lactogen (hPL), not β-hCG. **NEET-PG High-Yield Pearls:** * **Doubling Time:** In a healthy intrauterine pregnancy, β-hCG levels double every **48–72 hours**. * **Peak Levels:** β-hCG reaches its peak concentration at **8–10 weeks** (approx. 100,000 mIU/mL) and then declines to a lower plateau. * **Structure:** It is a glycoprotein with an alpha and beta subunit. The **alpha subunit** is identical to LH, FSH, and TSH; the **beta subunit** is unique, which is why it is used for pregnancy testing. * **Thyroid Connection:** Due to its structural similarity to TSH, very high levels of β-hCG (as seen in molar pregnancies) can cause gestational hyperthyroidism.

Q: The Priscilla White classification is used in which of the following conditions?

Gestational diabetes mellitus. **Explanation:** The **Priscilla White Classification** is a clinical tool used to categorize **Diabetes Mellitus in pregnancy**. It is highly significant because it assesses maternal risk and predicts fetal outcomes based on the age of onset, duration of the disease, and the presence of diabetic complications (vascular involvement). **Why Option C is Correct:** The classification distinguishes between **Gestational Diabetes (Class A)** and **Pregestational Diabetes (Classes B through T)**. * **Class A1:** Diet-controlled GDM. * **Class A2:** GDM requiring insulin or oral hypoglycemics. * **Classes B-T:** Represent pre-existing diabetes with increasing severity. For example, **Class F** denotes diabetic nephropathy, **Class R** denotes retinopathy, and **Class H** denotes ischemic heart disease. **Why Other Options are Incorrect:** * **A. Gestational Hypertension:** Classified by the NHBPEP/ACOG criteria into Preeclampsia, Eclampsia, Chronic Hypertension, and Gestational Hypertension. * **B. Cardiac Disorders:** Primarily classified using the **NYHA (New York Heart Association)** functional classification (Class I-IV) or the **Modified WHO (mWHO)** risk classification. * **D. Thyroid Disorders:** Diagnosed based on trimester-specific TSH and Free T4 levels; no specific "White-style" alphanumeric classification is used. **High-Yield Clinical Pearls for NEET-PG:** * **Most common** class in pregnancy: Class A (Gestational Diabetes). * **Worst prognostic factor** in White’s classification: **Class H** (Ischemic Heart Disease). * **Class T** refers to a patient who has undergone a **Renal Transplant**. * Remember: As the letter progresses further into the alphabet (B $\rightarrow$ T), the vascular complications increase and the fetal prognosis generally worsens.

Q: A 30-year-old class D diabetic is concerned about pregnancy. She can be assured that which of the following risks is the same for her as for the general population?

Fetal cystic fibrosis. **Explanation:** The core concept here is distinguishing between **maternal/fetal complications directly influenced by maternal hyperglycemia** and **unrelated genetic conditions.** **Why Fetal Cystic Fibrosis is the Correct Answer:** Cystic Fibrosis (CF) is an **autosomal recessive genetic disorder** caused by mutations in the CFTR gene. Its inheritance depends solely on the carrier status of the parents. Maternal diabetes (pre-gestational or gestational) does not alter the genetic makeup of the gametes or the risk of Mendelian inheritance. Therefore, the risk remains identical to that of the general population. **Why the Other Options are Incorrect:** * **Preeclampsia and Eclampsia:** Diabetic patients (especially Class D with underlying vasculopathy) have a **3–4 times higher risk** of hypertensive disorders due to endothelial dysfunction and underlying renal involvement. * **Infection:** Hyperglycemia impairs leukocyte function (chemotaxis and phagocytosis), making diabetic mothers more prone to **monilial vulvovaginitis, urinary tract infections (UTIs), and puerperal sepsis.** * **Postpartum Hemorrhage (PPH):** Diabetes is associated with **fetal macrosomia**, which leads to overdistension of the uterus. This increases the risk of **uterine atony**, the leading cause of PPH. **High-Yield NEET-PG Pearls:** * **White’s Classification:** Class D refers to diabetes with onset before age 10, duration >20 years, or the presence of benign retinopathy. * **Most Common Fetal Anomaly in Diabetes:** Cardiac defects (specifically **Ventricular Septal Defect**). * **Most Specific Fetal Anomaly:** **Caudal Regression Syndrome** (Sacral Agenesis). * **HbA1c Goal:** Ideally **<6.0–6.5%** preconception to minimize the risk of congenital malformations.

Q: Which of the following tumors is not commonly known to increase in size during pregnancy?

Glioma. **Explanation:** The correct answer is **A. Glioma**. While pregnancy involves significant physiological and hormonal shifts, gliomas (intrinsic brain tumors) do not typically show a predictable pattern of growth or clinical worsening during gestation. In contrast, several other intracranial and soft tissue tumors are highly sensitive to the hormonal environment of pregnancy. **Why the other options are incorrect:** * **Pituitary Adenoma:** During pregnancy, the pituitary gland undergoes physiological hyperplasia (mainly lactotrophs). Existing macroadenomas can enlarge significantly due to high estrogen levels, potentially leading to visual field defects (bitemporal hemianopia) or headaches. * **Meningioma:** These tumors frequently express **progesterone receptors**. The high levels of progesterone during pregnancy can cause rapid enlargement of meningiomas, often leading to the first presentation of symptoms or a sudden worsening of pre-existing neurological deficits. * **Neurofibroma:** Patients with Neurofibromatosis Type 1 (NF1) often experience an increase in the size and number of neurofibromas during pregnancy. This is attributed to increased vascularity and the presence of hormonal receptors within the tumors. **High-Yield Clinical Pearls for NEET-PG:** * **Meningioma & Progesterone:** Always remember the association between progesterone and meningioma growth; symptoms often regress postpartum as hormone levels drop. * **Choriocarcinoma:** If a patient presents with new-onset neurological deficits and a history of recent pregnancy/molar pregnancy, consider brain metastasis from choriocarcinoma. * **Prolactinoma Management:** In pregnant women with microprolactinomas, Bromocriptine is usually stopped, but they must be monitored clinically for signs of tumor expansion.

Q: Which of the following is an absolute contraindication for the treatment of thyrotoxicosis in a 6-month pregnant patient?

Radioactive iodine (I-131) therapy. **Explanation:** The correct answer is **Radioactive iodine (I-131) therapy**. **Why it is the correct answer:** Radioactive iodine (I-131) is **absolutely contraindicated** during pregnancy because it readily crosses the placenta. By the 10th–12th week of gestation, the fetal thyroid gland begins to concentrate iodine. Administration of I-131 after this period leads to the permanent destruction of the fetal thyroid gland, resulting in **congenital hypothyroidism (cretinism)** and potential neurodevelopmental delays. **Why the other options are incorrect:** * **Antithyroid drugs (ATDs):** These are the first-line treatment for thyrotoxicosis in pregnancy. While they cross the placenta, they are used at the lowest effective dose. (Note: PTU is preferred in the 1st trimester; Methimazole is preferred in the 2nd and 3rd trimesters). * **Telepaque (Iopanoic acid):** This is an iodinated contrast agent sometimes used for the rapid control of severe thyrotoxicosis. While not a first-line long-term therapy, it is not an absolute contraindication like I-131. * **Surgery (Subtotal Thyroidectomy):** Surgery is indicated if the patient is allergic to ATDs or requires high doses that threaten the fetus. The safest time for surgery is the **second trimester** (the patient in the question is 6 months/2nd trimester). **High-Yield Clinical Pearls for NEET-PG:** * **Fetal Thyroid Activity:** Starts at **12 weeks** gestation. * **Drug of Choice:** **Propylthiouracil (PTU)** in the 1st trimester (to avoid Methimazole embryopathy like *aplasia cutis*); **Methimazole** in the 2nd and 3rd trimesters (to avoid PTU-induced maternal hepatotoxicity). * **Goal of Therapy:** Maintain maternal Free T4 levels at the **upper limit of the normal non-pregnant range** to minimize the risk of fetal hypothyroidism. * **Beta-blockers:** Propranolol can be used for symptomatic relief but long-term use is associated with IUGR.

Q: Hypothyroidism in pregnancy causes which of the following complications?

Mental retardation. **Explanation:** **Correct Answer: C. Mental retardation** The fetal thyroid gland only begins to function and concentrate iodine around the **12th week of gestation**. Prior to this, the fetus is entirely dependent on the transplacental transfer of maternal thyroxine (T4) for brain development. Thyroid hormones are critical for neuronal migration, synaptogenesis, and myelination. Maternal hypothyroidism during this crucial window leads to irreversible neurocognitive deficits and **mental retardation** (cretinism) in the offspring. **Analysis of Incorrect Options:** * **A. Macrosomia:** This is typically associated with **Gestational Diabetes Mellitus (GDM)** due to fetal hyperinsulinemia. Hypothyroidism is more commonly associated with Low Birth Weight (LBW) or Intrauterine Growth Restriction (IUGR). * **B. Polyhydramnios:** This is associated with conditions like maternal diabetes, fetal structural anomalies (e.g., esophageal atresia), or multiple gestations. Hypothyroidism is more likely to be associated with **Oligohydramnios** if it leads to placental insufficiency. * **D. Abortion:** While severe untreated hypothyroidism *can* increase the risk of early pregnancy loss, it is a non-specific complication. In the context of NEET-PG questions, **Mental Retardation** is the "hallmark" and most specific developmental consequence emphasized for maternal hypothyroidism. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Levothyroxine is the treatment of choice. * **Dose Adjustment:** Requirements of Levothyroxine increase by **30-50%** during pregnancy. * **Target TSH:** Ideally kept <2.5 mIU/L in the first trimester and <3.0 mIU/L in the second and third trimesters. * **Screening:** Universal screening for thyroid dysfunction in pregnancy is currently recommended in India due to the high prevalence of iodine deficiency.

Question 1

True about hCG is:

Accepted Answer

Alpha subunit identical to LH, FSH and TSH

Answer

Causes involution of corpus luteum

Answer

Doubles in 7-10 days

Answer

Maximum level seen at 50 days of gestation

Question 2

A 28-year-old pregnant woman with no known medical conditions presents for her first prenatal visit. Her fasting blood glucose level is 144 mg/dL and she has 3+ glycosuria. How do you counsel her regarding the risk of fetal anomalies?

Accepted Answer

She has a four-fold higher risk of having a child with congenital anomalies.

Answer

Her risk is the same as other women of the same age group.

Answer

She has a twice as high risk as other 28-year-old women.

Answer

She has a 10 times higher risk than other women.

Question 3

Which of the following statements about hCG is FALSE?

Accepted Answer

hCG has a non-specific alpha subunit and a specific beta subunit.

Answer

hCG is a lipoprotein.

Answer

hCG can be detected by radioimmunoassay more than 6 days post-conception.

Answer

hCG is secreted by the corpus luteum.

Question 4

What is the target range for fasting blood sugar in a pregnant diabetic female?

Accepted Answer

70-100 mg%

Answer

100-130 mg%

Answer

130-160 mg%

Answer

160-190 mg%

Question 5

What is the main function of beta-human chorionic gonadotropin (β-hCG)?

Accepted Answer

Maintain the corpus luteum

Answer

Stimulate the decidua

Answer

Initiate implantation

Answer

Initiate breast growth

Question 6

The Priscilla White classification is used in which of the following conditions?

Accepted Answer

Gestational diabetes mellitus

Answer

Gestational hypertension

Answer

Cardiac disorders in pregnancy

Answer

Thyroid disorders of pregnancy

Question 7

A 30-year-old class D diabetic is concerned about pregnancy. She can be assured that which of the following risks is the same for her as for the general population?

Accepted Answer

Fetal cystic fibrosis

Answer

Preeclampsia and eclampsia

Answer

Infection

Answer

Postpartum hemorrhage after vaginal delivery

Question 8

Which of the following tumors is not commonly known to increase in size during pregnancy?

Accepted Answer

Glioma

Answer

Pituitary adenoma

Answer

Meningioma

Answer

Neurofibroma

Question 9

Which of the following is an absolute contraindication for the treatment of thyrotoxicosis in a 6-month pregnant patient?

Accepted Answer

Radioactive iodine (I-131) therapy

Answer

Antithyroid drug

Answer

Telepaque

Answer

Surgery

Question 10

Hypothyroidism in pregnancy causes which of the following complications?

Accepted Answer

Mental retardation

Answer

Macrosomia

Answer

Polyhydramnios

Answer

Abortion

Endocrinology of Pregnancy — MCQs

Endocrinology of Pregnancy — MCQs

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