Endocrinology of Pregnancy Practice Questions

Q: Maximum level of beta HCG is seen at what gestational age in weeks?

10 weeks. **Explanation:** Human Chorionic Gonadotropin (hCG) is a glycoprotein hormone produced by the syncytiotrophoblast. Its primary role is to maintain the corpus luteum, ensuring the continued production of progesterone until the placenta takes over (the luteo-placental shift). **Why 10 weeks is correct:** The levels of beta-hCG rise exponentially in early pregnancy, doubling approximately every 48 hours. The hormone reaches its **peak concentration between 8 to 12 weeks** of gestation (mean peak at **10 weeks**), reaching values of approximately 100,000 mIU/mL. After this peak, levels decline significantly and reach a stable plateau around 20 weeks, which is maintained until term. **Analysis of incorrect options:** * **8 weeks:** While hCG levels are very high at this stage, they have not yet reached their absolute zenith in a typical pregnancy. * **9 weeks:** This is within the rising phase towards the peak, but statistically, the 10th week represents the most common point of maximum concentration. * **11 weeks:** Levels may still be high, but they generally begin their downward trend toward the second-trimester plateau after the 10-week mark. **High-Yield Clinical Pearls for NEET-PG:** * **Doubling Time:** In a healthy intrauterine pregnancy, hCG levels should increase by at least 66% every 48 hours. * **Discriminatory Zone:** The level of hCG at which a gestational sac should be visible on TVS (usually 1,500–2,000 mIU/mL). * **Abnormal Levels:** Pathologically high hCG levels are seen in **Molar pregnancy** and **Multiple gestations**, while lower-than-expected levels suggest **Ectopic pregnancy** or **Spontaneous abortion**. * **Subunits:** The **alpha subunit** is identical to LH, FSH, and TSH; the **beta subunit** is unique to hCG, making it the basis for pregnancy tests.

Q: Which oral hypoglycemic agent is safely given in pregnancy?

Metformin. **Explanation:** The management of hyperglycemia in pregnancy primarily relies on lifestyle modifications and **Insulin**, which remains the gold standard as it does not cross the placenta. However, among oral hypoglycemic agents (OHAs), **Metformin** is the most widely accepted and safely used option. **1. Why Metformin is Correct:** Metformin (a Biguanide) is category B in pregnancy. While it does cross the placenta, it is not associated with increased rates of major congenital malformations or fetal harm. It is particularly useful in patients with Polycystic Ovary Syndrome (PCOS) to prevent early pregnancy loss and in Gestational Diabetes Mellitus (GDM) when patients are needle-phobic or have compliance issues with insulin. **2. Why Other Options are Incorrect:** * **Sitagliptin (DPP-4 Inhibitor):** There is insufficient human data regarding its safety and efficacy during pregnancy. It is generally avoided. * **Glimepiride (Sulfonylurea):** Most second and third-generation sulfonylureas (except Glyburide/Glibenclamide in specific cases) are avoided due to the risk of prolonged neonatal hypoglycemia and lack of long-term safety data. * **Pioglitazone (Thiazolidinedione):** These are contraindicated as they have shown embryotoxicity in animal studies and can affect fetal bone health. **Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC):** Insulin is the DOC for both GDM and Pregestational Diabetes. * **Metformin & PCOS:** Continuing Metformin in the first trimester for PCOS patients reduces the risk of miscarriage and development of GDM. * **Glibenclamide:** It is the only other OHA sometimes considered, but it is associated with higher rates of macrosomia and neonatal hypoglycemia compared to Insulin. * **Target Blood Sugars:** Fasting <95 mg/dL, 1-hour postprandial <140 mg/dL, and 2-hour postprandial <120 mg/dL.

Q: In testicular feminisation syndrome, which of the following statements are true?

Normal breast size is observed. **Explanation:** **Testicular Feminization Syndrome (now commonly known as Complete Androgen Insensitivity Syndrome - CAIS)** occurs due to a mutation in the androgen receptor gene. Although the individual has a **46, XY** karyotype and functioning testes, the peripheral tissues are completely unresponsive to androgens. **Why Option B is Correct:** In CAIS, the testes produce high levels of testosterone. Because the receptors are insensitive, this testosterone is peripherally converted (aromatized) into **estrogen**. This estrogen, unopposed by androgens, leads to the development of **normal female breasts** (often with pale areolae). This is a hallmark clinical feature. **Analysis of Incorrect Options:** * **Option A:** The karyotype is 46, XY. Therefore, the buccal smear is **chromatin negative** (no Barr body). * **Option C:** There is a complete absence of the uterus, fallopian tubes, and upper third of the vagina due to the production of **Anti-Müllerian Hormone (AMH)** by the fetal testes. Consequently, there is **primary amenorrhea**, not scanty menstruation. * **Option D:** While CAIS is an X-linked recessive condition and can run in families, the question asks for the "most characteristic" clinical feature among the choices provided. In many standard textbooks, the phenotypic female appearance with normal breast development is the classic diagnostic pointer. **High-Yield Clinical Pearls for NEET-PG:** 1. **Phenotype:** Tall female, absent/scanty axillary and pubic hair (due to androgen insensitivity). 2. **Gonads:** Undescended testes (often found in the inguinal canal or labia majora). 3. **Risk:** Increased risk of **Gonadoblastoma/Dysgerminoma** after puberty; gonadectomy is recommended after the completion of puberty (to allow natural breast development). 4. **Vagina:** Blind-ending pouch (short vagina).

Q: In pregnancy, which is the best parameter to be measured in thyroid function tests?

TSH. **Explanation:** The assessment of thyroid function in pregnancy is complex due to physiological changes. **Serum TSH** is the most sensitive and reliable parameter for screening and diagnosing thyroid disorders in pregnancy. **Why TSH is the correct answer:** During pregnancy, high levels of Estrogen increase **Thyroid Binding Globulin (TBG)** levels. Additionally, hCG (which shares an alpha subunit with TSH) directly stimulates the TSH receptors on the thyroid gland. Despite these fluctuations, the pituitary-thyroid axis remains the most sensitive indicator of thyroid status. TSH levels slightly decrease in the first trimester due to hCG stimulation but remain the gold standard for monitoring because it reflects the actual metabolic status of the patient relative to pregnancy-specific reference ranges. **Why other options are incorrect:** * **Total T4 and Total T3 (Options C & D):** These are unreliable because Estrogen increases TBG, which leads to a physiological rise in *total* hormone levels (approx. 1.5 times the non-pregnant state). Therefore, elevated Total T3/T4 does not necessarily indicate hyperthyroidism. * **Free T3 (Option B):** While Free T4 is often used alongside TSH, Free T3 is rarely used as a primary screening tool unless T3-toxicosis is suspected. Free hormone assays can also be technically challenging due to protein binding changes in pregnancy. **High-Yield Clinical Pearls for NEET-PG:** 1. **Trimester-specific TSH ranges:** If lab-specific ranges aren't available, the traditional targets are: 1st Trimester: **0.1–2.5** mIU/L; 2nd Trimester: **0.2–3.0** mIU/L; 3rd Trimester: **0.3–3.0** mIU/L. 2. **hCG Effect:** Peak hCG levels (at 10–12 weeks) correlate with the lowest TSH levels. 3. **Drug of Choice:** **Propylthiouracil (PTU)** is preferred in the 1st trimester (to avoid Methimazole embryopathy), while **Methimazole** is preferred in the 2nd and 3rd trimesters (to avoid PTU-induced hepatotoxicity).

Q: True about Braxton Hicks' contractions are all, except?

Painful. **Explanation:** Braxton Hicks contractions are intermittent, spontaneous, non-rhythmic uterine contractions that occur during pregnancy. The hallmark of these contractions is that they are **painless**. **1. Why "Painful" is the correct answer (the exception):** Braxton Hicks contractions are characterized by a tightening sensation in the abdomen but do not cause cervical dilatation or effacement. Unlike true labor pains, they are **painless**, irregular in frequency, and usually subside with rest or hydration. If contractions become painful and regular, they may indicate preterm or true labor. **2. Analysis of other options:** * **Felt at 4th month:** These contractions start early in pregnancy (around 6 weeks) but are generally not palpable or felt by the mother until the second trimester, typically around the **4th month (16 weeks)**. * **Contractions last for 1 min:** A typical Braxton Hicks contraction lasts approximately **30 to 60 seconds**, though they can occasionally last up to 2 minutes. * **Present even when fetus is dead:** These are intrinsic myometrial activities. Since they are independent of fetal life or movements, they persist even in cases of **Intrauterine Fetal Death (IUFD)**. **Clinical Pearls for NEET-PG:** * **Distinguishing Feature:** Braxton Hicks contractions disappear with walking or sedation, whereas true labor pains intensify. * **Physiological Role:** They are thought to help in the "ripening" of the cervix and maintaining uterine blood flow. * **False Labor:** When Braxton Hicks contractions become frequent and uncomfortable near term, they are often referred to as "False Labor."

Q: A primigravida at 10 weeks gestation, with pre-existing diabetes managed on insulin, has been hospitalized for ketoacidosis. Which of the following is the most probable cause for her ketoacidosis?

Hyperemesis gravidarum. **Explanation:** In early pregnancy, **Hyperemesis Gravidarum (HG)** is a classic trigger for Diabetic Ketoacidosis (DKA) in women with pre-existing Type 1 Diabetes. The underlying mechanism involves severe vomiting leading to **starvation ketosis**, dehydration, and electrolyte imbalances. The resulting carbohydrate deprivation forces the body to metabolize fats for energy, producing ketones. In a diabetic patient, this metabolic stress, combined with the inability to maintain oral intake and potential disruption of insulin dosing, rapidly escalates into DKA. **Analysis of Options:** * **Option A (Infection):** While infection is the most common cause of DKA in late pregnancy or non-pregnant states, the clinical context of a primigravida at **10 weeks** (peak hCG levels) strongly points toward HG as the primary culprit. * **Option C (Folic Acid):** Folic acid deficiency is associated with neural tube defects but has no physiological link to glycemic control or ketosis. * **Option D (Pancreatitis):** Though it can cause DKA, it is a much rarer complication in the first trimester compared to the high prevalence of pregnancy-related vomiting. **High-Yield NEET-PG Pearls:** 1. **Lower Threshold:** DKA in pregnancy occurs at lower blood glucose levels (often <200 mg/dL), a phenomenon known as **Euglycemic DKA**, due to the "accelerated starvation" state of pregnancy. 2. **Hormonal Influence:** Human Placental Lactogen (hPL), which increases insulin resistance, peaks in the third trimester; however, HG is the dominant metabolic challenge in the **first trimester**. 3. **Fetal Risk:** DKA is a medical emergency with a high risk of fetal demise (up to 10-30%).

Question 1

Maximum level of beta HCG is seen at what gestational age in weeks?

Accepted Answer

10 weeks

Answer

8 weeks

Answer

9 weeks

Answer

11 weeks

Question 2

Which oral hypoglycemic agent is safely given in pregnancy?

Accepted Answer

Metformin

Answer

Sitagliptin

Answer

Glimepride

Answer

Pioglitazone

Question 3

In testicular feminisation syndrome, which of the following statements are true?

Accepted Answer

Normal breast size is observed

Answer

Buccal smear is chromatin positive

Answer

Menstruation is scanty and infrequent

Answer

Familial incidence is recognised

Question 4

Luteal phase defect is best diagnosed by which of the following methods?

Accepted Answer

Endometrial biopsy

Answer

Serum progesterone levels

Answer

Basal body temperature

Answer

Ultrasonography

Question 5

You are treating a 27-year-old infertile patient with bromocriptine. What is the likely underlying diagnosis?

Accepted Answer

Hyperprolactinemia

Answer

Hyperpituitarism

Answer

Hypopituitarism

Answer

Polycystic ovarian disease (PCOD)

Question 6

In pregnancy, which is the best parameter to be measured in thyroid function tests?

Accepted Answer

TSH

Answer

Free T3

Answer

T4

Answer

Total T3

Question 7

Which of the following is true regarding hCG?

Accepted Answer

hCG can be detected as early as 8-9 days after conception

Answer

Half-life is around 7 days

Answer

Low levels are seen in hydatidiform mole

Answer

All of the above

Question 8

A pregnant woman at 12 weeks gestation has a fasting blood glucose of 170 mg/dL. What is the antidiabetic drug of choice?

Accepted Answer

Insulin

Answer

Metformin

Answer

Glipizide

Answer

Glibenclamide

Question 9

True about Braxton Hicks' contractions are all, except?

Accepted Answer

Painful

Answer

Felt at 4th month

Answer

Contractions last for 1 min

Answer

Present even when fetus is dead

Question 10

A primigravida at 10 weeks gestation, with pre-existing diabetes managed on insulin, has been hospitalized for ketoacidosis. Which of the following is the most probable cause for her ketoacidosis?

Accepted Answer

Hyperemesis gravidarum

Answer

Infection

Answer

Not taking regular folic acid

Answer

Pancreatitis

Endocrinology of Pregnancy — MCQs

Endocrinology of Pregnancy — MCQs

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