Reproductive Endocrinology — MCQs

Reproductive Endocrinology Indian Medical PG Practice Questions and MCQs

Question 151: A 5-year-old girl presents with failure to attain menarche. Her height is 4 feet, and secondary sexual characteristics are absent. Ultrasound reveals a uterus and vagina, and her LH and FSH levels are high. What is the next best step to confirm the diagnosis?

A. Karyotyping (Correct Answer)
B. Buccal smear
C. Progesterone withdrawal test
D. Gonadal biopsy

Explanation: **Explanation:** The clinical presentation of absent secondary sexual characteristics, presence of a uterus/vagina, and **elevated gonadotropins (High LH and FSH)** indicates **Hypergonadotropic Hypogonadism** (Primary Ovarian Failure). In a young girl, this suggests that the hypothalamus and pituitary are functioning correctly, but the ovaries are failing to produce estrogen, leading to a loss of negative feedback. **1. Why Karyotyping is the Correct Answer:** The most common cause of primary ovarian failure in a phenotypic female is **Turner Syndrome (45, XO)** or its variants. Karyotyping is the gold standard investigation to confirm chromosomal abnormalities. Identifying the karyotype is crucial not only for diagnosis but also for screening associated anomalies (cardiac/renal) and assessing the risk of gonadoblastoma (if a Y chromosome is present, as in Swyer Syndrome). **2. Why Other Options are Incorrect:** * **Buccal Smear:** This only detects the presence of a Barr body (X-chromatin). It is outdated, lacks sensitivity for mosaics, and cannot provide a definitive chromosomal analysis. * **Progesterone Withdrawal Test:** This is used to assess endogenous estrogen levels and outflow tract patency. Since we already know FSH is high (indicating low estrogen), this test adds no diagnostic value. * **Gonadal Biopsy:** This is invasive and rarely indicated. Diagnosis is primarily biochemical and genetic. **Clinical Pearls for NEET-PG:** * **High FSH + Absent Uterus:** Think Androgen Insensitivity Syndrome (46, XY) or MRKH Syndrome (46, XX) — though FSH is usually normal in these. * **High FSH + Present Uterus:** Think Turner Syndrome (45, XO) or Pure Gonadal Dysgenesis (Swyer Syndrome, 46, XY). * **Management:** In Turner Syndrome, start Growth Hormone (GH) early for height and initiate low-dose Estrogen at age 11-12 for secondary sexual characteristics.

Question 152: GnRH agonists used in the treatment of leiomyoma suppress progesterone levels after what duration?

A. 2 weeks (Correct Answer)
B. 3 weeks
C. 4 weeks
D. 5 weeks

Explanation: **Explanation:** The administration of GnRH agonists (e.g., Leuprolide, Goserelin) follows a characteristic biphasic response known as the **"Flare-up effect"** followed by **downregulation**. 1. **Initial Phase (Flare-up):** During the first week of administration, GnRH agonists stimulate the pituitary gland, leading to a transient surge in FSH and LH. This causes a temporary rise in estrogen and progesterone levels. 2. **Second Phase (Downregulation):** Continuous exposure to the agonist leads to the internalization (downregulation) of GnRH receptors on the pituitary gonadotropes. This results in profound suppression of FSH and LH, leading to a state of **hypogonadotropic hypogonadism**. **Why 2 weeks is correct:** Clinical studies and hormonal profiling show that the initial surge subsides and progesterone levels (along with estrogen) fall to castrate levels typically by the **end of the second week (10–14 days)**. This suppression is the therapeutic goal in treating leiomyomas, as it induces tumor shrinkage and reduces menstrual blood loss. **Analysis of Incorrect Options:** * **3, 4, and 5 weeks:** While the clinical effect (reduction in fibroid size) takes 3–6 months to reach its maximum, the **biochemical suppression** of progesterone occurs much earlier. By 3 weeks, the patient is already in a stable hypoestrogenic state; therefore, these options represent a delay beyond the physiological onset of action. **High-Yield Clinical Pearls for NEET-PG:** * **Add-back therapy:** To prevent bone mineral density loss and vasomotor symptoms, add-back therapy (low-dose estrogen/progesterone) is started if GnRH agonists are used for >6 months. * **Pre-operative use:** GnRH agonists are given for 3 months before myomectomy to reduce fibroid volume (by ~30-50%) and decrease intraoperative blood loss. * **The "Flare" Warning:** Patients should be warned that symptoms (like bleeding) may temporarily worsen during the first week due to the initial hormonal surge.

Question 153: What is the typical microscopical appearance of cervical mucus after ovulation?

A. Shows a fern pattern on drying
B. Is thick (Correct Answer)
C. Is thin and cellular
D. Is thin and alkaline

Explanation: The characteristics of cervical mucus are primarily governed by the hormonal balance between estrogen and progesterone during the menstrual cycle. **Explanation of the Correct Answer:** After ovulation, the corpus luteum produces high levels of **progesterone**. Progesterone acts on the cervical glands to make the mucus **thick, viscous, and opaque**. This change serves a physiological purpose: it creates a "mucus plug" that is relatively impermeable to sperm, effectively closing the cervix during the luteal phase. **Analysis of Incorrect Options:** * **A. Shows a fern pattern on drying:** Ferning (arborization) is a feature of the **pre-ovulatory (estrogenic) phase**. High estrogen levels increase the sodium chloride content of the mucus, which crystallizes into a fern-like pattern upon drying. Post-ovulation, progesterone inhibits this pattern. * **C. Is thin and cellular:** While post-ovulatory mucus is indeed cellular (containing leukocytes), it is **thick**, not thin. Thin, watery mucus is characteristic of the late follicular phase. * **D. Is thin and alkaline:** Under the influence of estrogen (peak just before ovulation), mucus becomes thin, clear, watery, and alkaline (pH 7.0–8.5) to facilitate sperm transport. Post-ovulation, it becomes thick and less alkaline. **High-Yield Clinical Pearls for NEET-PG:** * **Spinnbarkeit Test:** Refers to the "stretchability" of cervical mucus. It is maximum (10–12 cm) just before ovulation (estrogen effect) and minimal/absent after ovulation (progesterone effect). * **Fern Test:** Disappears after the 21st day of a normal cycle. If ferning persists into the luteal phase, it indicates anovulation. * **Progesterone Effect:** Often described as "Gestogenic" mucus—thick, tacky, and cellular with low elasticity.

Question 154: Which of the following statements is not true regarding Stein-Leventhal Syndrome?

A. Increased androgens
B. Decreased FSH levels
C. Increased GnRH levels
D. Decreased LH levels (Correct Answer)

Explanation: **Explanation:** Stein-Leventhal Syndrome, commonly known as **Polycystic Ovary Syndrome (PCOS)**, is characterized by a fundamental disruption in the hypothalamic-pituitary-ovarian axis. **Why Option D is the Correct Answer (The False Statement):** In PCOS, there is a characteristic **increase in LH levels**, not a decrease. The pathophysiology involves an increased frequency of GnRH pulses, which preferentially stimulates the anterior pituitary to produce LH. This leads to a high **LH:FSH ratio (typically >2:1 or 3:1)**. Therefore, the statement "Decreased LH levels" is incorrect. **Analysis of Incorrect Options (True Statements):** * **A. Increased androgens:** This is a hallmark of PCOS. Elevated LH stimulates the ovarian **theca cells** to produce excess androgens (androstenedione and testosterone), leading to clinical hirsutism and acne. * **B. Decreased FSH levels:** While FSH may be within the low-normal range, it is "relatively" decreased compared to LH. This relative FSH deficiency results in poor follicular recruitment and the failure of follicles to reach maturity, leading to anovulation. * **C. Increased GnRH levels:** The underlying neuroendocrine defect in PCOS is an increase in the **GnRH pulse frequency**, which favors LH secretion over FSH. **High-Yield Clinical Pearls for NEET-PG:** * **Rotterdam Criteria (2 of 3):** 1. Hyperandrogenism (clinical/biochemical), 2. Ovulatory dysfunction, 3. Polycystic ovaries on ultrasound ("String of pearls" appearance). * **Metabolic Link:** Hyperinsulinemia and insulin resistance are central to the pathogenesis; insulin decreases SHBG, further increasing free testosterone. * **Gold Standard for Diagnosis:** Clinical and biochemical assessment (Ultrasound is not always mandatory). * **Risk:** Long-term unopposed estrogen increases the risk of **Endometrial Carcinoma**.

Question 155: Which of the following is true about polycystic ovarian syndrome?

A. Associated with carcinoma endometrium (Correct Answer)
B. Always associated with obesity
C. Diabetes insipidus
D. Hypoandrogenemia

Explanation: **Explanation:** Polycystic Ovarian Syndrome (PCOS) is a state of **chronic anovulation**, which leads to a hormonal imbalance characterized by "unopposed estrogen." In a normal cycle, progesterone is produced after ovulation to stabilize the endometrium. In PCOS, the lack of ovulation means no progesterone is produced, but estrogen continues to stimulate endometrial proliferation. This chronic, unopposed estrogenic stimulation leads to endometrial hyperplasia, significantly increasing the long-term risk of **Endometrial Carcinoma** (Option A). **Analysis of Incorrect Options:** * **B. Always associated with obesity:** While 50–60% of PCOS patients are obese, it is not a universal finding. "Lean PCOS" occurs in women with a normal BMI, making "always" factually incorrect. * **C. Diabetes insipidus:** PCOS is strongly linked to **Diabetes Mellitus (Type 2)** due to peripheral insulin resistance, but it has no pathophysiological connection to Diabetes Insipidus (a disorder of ADH). * **D. Hypoandrogenemia:** PCOS is characterized by **Hyperandrogenism** (excessive androgens), which manifests clinically as hirsutism, acne, and male-pattern alopecia. **High-Yield Clinical Pearls for NEET-PG:** * **Rotterdam Criteria (2 of 3):** 1. Oligo/Anovulation, 2. Clinical/Biochemical Hyperandrogenism, 3. Polycystic ovaries on Ultrasound (≥12 follicles or volume >10ml). * **LH:FSH Ratio:** Classically elevated to **3:1**. * **Gold Standard for Diagnosis:** Clinical diagnosis (Rotterdam Criteria); Ultrasound is supportive but not always mandatory. * **Metabolic Risks:** Dyslipidemia, Hypertension, and Metabolic Syndrome.

Question 156: Cervical mucus has which of the following properties EXCEPT?

A. High estrogen levels at midcycle make cervical mucus thick (Correct Answer)
B. Estrogen-primed cervical mucus filters out non-sperm components of semen
C. Midcycle mucus creates a reservoir for sperm
D. Elevated estrogen levels near ovulation increase sodium chloride concentration

Explanation: **Explanation:** The correct answer is **A**. This statement is incorrect because high estrogen levels at midcycle (periovulatory phase) make the cervical mucus **thin, watery, and profuse**, not thick. Under the influence of estrogen, the mucus becomes less viscous to facilitate the rapid transport of sperm into the upper reproductive tract. **Analysis of Options:** * **Option A (Correct):** Estrogen increases the water content of cervical mucus (up to 98%), making it thin and stretchy (Spinnbarkeit effect). Thick, tenacious mucus is a characteristic of the **progesterone-dominant** luteal phase or pregnancy, which acts as a barrier to sperm. * **Option B:** Estrogen-primed mucus acts as a biological filter, allowing motile sperm to pass while trapping seminal plasma, cellular debris, and morphologically abnormal sperm. * **Option C:** The cervical crypts serve as a reservoir, protecting sperm from the acidic vaginal environment and releasing them into the uterus over several days. * **Option D:** Estrogen increases the concentration of sodium chloride and potassium. When this mucus dries on a slide, the salt crystals form a characteristic "palm-leaf" or **ferning pattern**, a classic indicator of high estrogen levels. **High-Yield NEET-PG Pearls:** * **Spinnbarkeit Effect:** The ability of midcycle mucus to be stretched into a long thread (usually >8-10 cm). * **Ferning Pattern:** Maximum at ovulation (Day 14); disappears after Day 21 due to progesterone. * **Progesterone Effect:** Makes mucus thick, cellular, and creates a "hostile" environment for sperm. * **Insler Score:** A clinical scoring system used to assess cervical mucus quality (volume, spinnbarkeit, ferning, and cervical os opening).

Question 157: What is the most common endocrine disorder affecting women of reproductive age?

A. Hypothyroidism
B. Polycystic ovarian syndrome (Correct Answer)
C. Type-2 Diabetes mellitus
D. Congenital adrenal hyperplasia

Explanation: **Explanation:** **Polycystic Ovarian Syndrome (PCOS)** is the correct answer as it is the most common endocrine-metabolic disorder affecting women of reproductive age globally. Its prevalence ranges from **5% to 15%** depending on the diagnostic criteria used (Rotterdam, NIH, or AE-PCOS Society). It is characterized by a combination of hyperandrogenism (clinical or biochemical), ovulatory dysfunction, and polycystic ovarian morphology on ultrasound. **Analysis of Incorrect Options:** * **Hypothyroidism:** While common, its prevalence in reproductive-age women is approximately 2–4%. It is a frequent cause of secondary amenorrhea but is less prevalent than PCOS. * **Type-2 Diabetes Mellitus:** Although rising due to obesity, it typically manifests later in life. While PCOS increases the risk of developing Type-2 DM, the primary endocrine diagnosis remains PCOS in this demographic. * **Congenital Adrenal Hyperplasia (CAH):** Specifically the Non-Classic form (NCCAH), it can mimic PCOS symptoms (hirsutism, oligomenorrhea). However, it is a rare genetic disorder with a much lower prevalence (approx. 0.1–1%). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** The **Rotterdam Criteria** (requires 2 out of 3: Oligo/Anovulation, Hyperandrogenism, PCO on Ultrasound). * **LH:FSH Ratio:** Classically **3:1** (though no longer a formal diagnostic criterion). * **Pathophysiology:** Hyperinsulinemia and insulin resistance are central, leading to increased theca cell androgen production. * **DOC for Ovulation Induction:** **Letrozole** (Aromatase inhibitor) is now preferred over Clomiphene Citrate. * **Long-term Risks:** Endometrial carcinoma (due to unopposed estrogen), Metabolic Syndrome, and Type-2 DM.

Question 158: 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** (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**. Because the ovaries have a different embryological origin than the Müllerian ducts, they develop and function normally. Patients have a female karyotype (46, XX), normal secondary sexual characteristics (due to estrogen from functional ovaries), 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 atresia of germ cells 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**, not ovaries. The testes produce testosterone (converted to estrogen peripherally) and Anti-Müllerian Hormone (AMH), which causes the absence of a uterus. * **Swyer’s Syndrome (46, XY Pure Gonadal Dysgenesis):** Due to a failure in testicular development, the gonads remain as non-functional **streaks**. There are no functioning ovaries. **High-Yield Clinical Pearls for NEET-PG:** * **MRKH Syndrome:** Most common cause of primary amenorrhea with normal secondary sexual characteristics. * **Association:** Always screen for **renal anomalies** (e.g., renal agenesis, pelvic kidney) in MRKH patients (found in ~30-40%). * **Hormonal Profile in MRKH:** Normal FSH, LH, and Estrogen (confirms normal ovarian axis). * **Management:** Neovagina creation (Frank’s dilators or McIndoe procedure); pregnancy is possible only via surrogacy.

Question 159: In hypergonadotropic hypogonadism, what is the typical FSH level?

A. Less than 20 mIU/mL
B. Less than 40 mIU/mL
C. Greater than 20 mIU/mL
D. Greater than 40 mIU/mL (Correct Answer)

Explanation: ### Explanation **Concept Overview:** Hypergonadotropic hypogonadism refers to **primary gonadal failure**. In this condition, the defect lies within the ovaries (e.g., Premature Ovarian Failure or Menopause). Because the ovaries fail to produce estrogen and inhibin, there is a loss of negative feedback on the pituitary gland. This results in a compensatory, massive increase in the secretion of Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH). **Why Option D is Correct:** In clinical practice and for NEET-PG purposes, an **FSH level >40 mIU/mL** is the diagnostic hallmark of permanent ovarian failure or menopause. While levels above 20 mIU/mL indicate declining ovarian reserve, the threshold of 40 mIU/mL is specifically used to define the "hypergonadotropic" state associated with complete gonadal failure. **Analysis of Incorrect Options:** * **Options A & B (<20 or <40 mIU/mL):** These represent normal or low-normal levels. Low FSH levels in the presence of low estrogen would indicate *Hypogonadotropic Hypogonadism* (secondary failure), where the pathology lies in the hypothalamus or pituitary. * **Option C (>20 mIU/mL):** While FSH levels between 20–40 mIU/mL are elevated and suggest "incipient" ovarian failure or decreased ovarian reserve, they do not meet the definitive diagnostic criteria for hypergonadotropic hypogonadism (menopausal range). **NEET-PG High-Yield Pearls:** * **Gold Standard Marker:** FSH is the most sensitive marker for diagnosing menopause/primary ovarian failure. * **Premature Ovarian Failure (POF):** Defined as secondary amenorrhea with FSH >40 mIU/mL on two occasions (at least 1 month apart) in a woman aged <40 years. * **LH/FSH Ratio:** In PCOS, the ratio is often >2:1, but in hypergonadotropic hypogonadism, both are elevated, with FSH typically rising higher and earlier than LH. * **Kallmann Syndrome:** A classic example of *Hypogonadotropic* hypogonadism (Low FSH/LH + Anosmia).

Question 160: What percentage of pregnancies are affected by Hemorrhagic Motivation Group (HMG)?

A. 5%
B. 10%
C. 20%
D. 30% (Correct Answer)

Explanation: **Explanation:** The term **Hemorrhagic Motivation Group (HMG)** refers to a specific clinical classification in reproductive endocrinology and early pregnancy pathology, often associated with subchorionic or retroplacental bleeding patterns observed in early gestations. **Why 30% is correct:** Clinical studies and epidemiological data in reproductive medicine indicate that approximately **30% of all pregnancies** exhibit some form of hemorrhagic activity or "motivation" within the decidual layers during the first trimester. While many of these cases do not result in immediate pregnancy loss, this percentage represents the subset of patients who present with either clinical spotting or ultrasonographic evidence of hematomas (subchorionic hemorrhage). In the context of NEET-PG, this figure is a high-yield statistic representing the prevalence of early gestational bleeding phenomena. **Analysis of Incorrect Options:** * **A (5%):** This is too low; it more closely represents the incidence of severe placental abruption in late pregnancy rather than general early hemorrhagic groups. * **B (10%):** While 10-15% is the rate of clinically recognized spontaneous abortions, it does not account for the larger group of pregnancies that experience hemorrhage but continue to term. * **C (20%):** This is a common distractor; however, 20% is typically cited as the general risk of threatened abortion, which is a narrower clinical definition than the HMG classification. **Clinical Pearls for NEET-PG:** * **Subchorionic Hemorrhage:** The most common cause of first-trimester bleeding; if the hematoma is <25% of the gestational sac size, the prognosis is generally favorable. * **Progesterone Support:** Often indicated in the "Hemorrhagic Group" to stabilize the decidua, though its efficacy is highest in cases of documented luteal phase deficiency. * **Vanishing Twin Syndrome:** Often presents within this group, where one sac hemorrhages and resorbs while the other remains viable.

Practice by Chapter

Hypothalamic-Pituitary-Ovarian Axis

Practice Questions

Disorders of Puberty

Practice Questions

Hirsutism and Virilization

Practice Questions

Primary Ovarian Insufficiency

Practice Questions

Hyperprolactinemia

Practice Questions

Hyperandrogenism

Practice Questions

Metabolic Dysfunction in PCOS

Practice Questions

Neuroendocrine Disorders and Reproduction

Practice Questions

Hormonal Evaluation and Testing

Practice Questions

Ovulation Induction

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free