Reproductive Endocrinology Practice Questions

Q: A 16-year-old girl presents with rapid onset hirsutism and amenorrhea. What is the best investigation?

Testosterone estimation. **Explanation:** The clinical presentation of **rapid onset hirsutism** accompanied by **amenorrhea** in a young girl is a "red flag" that strongly suggests a virilizing tumor (either ovarian or adrenal) rather than a functional disorder like PCOS. **1. Why Testosterone estimation is the correct answer:** In cases of rapid-onset virilization, the primary goal is to rule out an androgen-secreting tumor. **Serum Testosterone** is the most important initial marker. A level **>200 ng/dL** is highly suggestive of an ovarian androgen-secreting tumor (e.g., Sertoli-Leydig cell tumor). Testosterone is the most potent androgen and its elevation directly correlates with the severity of virilization. **2. Why other options are incorrect:** * **DHEAS estimation:** While DHEAS is a marker for adrenal tumors (levels >700 µg/dL suggest adrenal carcinoma), Testosterone is generally considered the first-line screening investigation for overall virilization. * **ACTH estimation:** This is used to diagnose Cushing’s syndrome or Addison’s disease. While Cushing’s can cause hirsutism, it presents with other systemic features (moon face, striae) and is not the primary screen for rapid virilization. * **LH and FSH estimation:** These are used to diagnose PCOS (LH:FSH ratio >2:1) or Primary Ovarian Insufficiency. PCOS typically presents with *gradual* onset hirsutism, not the rapid progression described here. **Clinical Pearls for NEET-PG:** * **Gradual onset hirsutism + Obesity + LH:FSH >2:1** = PCOS. * **Rapid onset hirsutism + Virilization + Testosterone >200 ng/dL** = Ovarian Tumor. * **Rapid onset hirsutism + Virilization + DHEAS >700 µg/dL** = Adrenal Tumor. * **Ferriman-Gallwey Score:** Used to clinically quantify hirsutism (Score ≥8 is significant).

Q: Withdrawal bleeding with progesterone is seen in an otherwise amenorrheic woman due to which of the following conditions?

Anovulation. **Explanation:** The **Progesterone Challenge Test (PCT)** is a fundamental diagnostic tool in evaluating secondary amenorrhea. For withdrawal bleeding to occur after progesterone administration, two physiological prerequisites must be met: 1. **Adequate Endogenous Estrogen:** The ovaries must be producing enough estrogen to prime and proliferate the endometrium. 2. **Patent Outflow Tract:** The uterus and vagina must be anatomically intact. **Why Anovulation is the Correct Answer:** In **Anovulation** (e.g., PCOS), the ovaries produce estrogen, but because ovulation does not occur, no corpus luteum is formed, and no progesterone is produced. This leads to a state of "unopposed estrogen," causing a proliferative endometrium. When exogenous progesterone is given and then stopped, it mimics the natural decline of progesterone, causing the built-up endometrium to shed (withdrawal bleed). **Analysis of Incorrect Options:** * **Hypogonadotropic Hypogonadism (A):** There is a failure of the Pituitary/Hypothalamus. Low FSH/LH leads to low estrogen levels. Without estrogen priming, the endometrium remains atrophic, and no bleeding occurs. * **Ovarian Failure (C):** The ovaries are unresponsive or depleted of follicles. Despite high FSH, estrogen levels are negligible, leading to a negative PCT. * **Tuberculosis Endometritis (D):** This causes destruction of the endometrial lining or synechiae (Asherman-like syndrome). Even with adequate hormones, there is no functional tissue to shed. **NEET-PG High-Yield Pearls:** * **Positive PCT:** Confirms anovulation and adequate estrogen (e.g., PCOS). * **Negative PCT:** Indicates either **low estrogen** (Hypothalamic/Ovarian failure) or **endometrial/outflow tract issues**. * The next step after a negative PCT is the **Estrogen + Progesterone Challenge Test**. If bleeding occurs now, the defect is in the HPO axis; if no bleeding occurs, the defect is in the outflow tract (Asherman’s or MRKH).

Q: What is the most effective treatment for hirsutism?

Low-dose oral contraceptive pills (OCPs). **Explanation:** The most effective first-line treatment for hirsutism (excessive terminal hair growth in a male-pattern distribution) is **Low-dose Oral Contraceptive Pills (OCPs)**. **Why OCPs are the Correct Answer:** OCPs address the pathophysiology of hirsutism through three primary mechanisms: 1. **Suppression of LH:** By providing negative feedback, OCPs decrease LH secretion, which in turn reduces ovarian androgen production. 2. **Increase in SHBG:** The estrogen component stimulates the liver to produce Sex Hormone Binding Globulin (SHBG), which binds free testosterone, making it biologically inactive. 3. **Adrenal Suppression:** They also cause a mild decrease in adrenal androgen synthesis. **Analysis of Incorrect Options:** * **Metformin (A):** While used in PCOS to manage insulin resistance and induce ovulation, it is significantly less effective than OCPs for treating cutaneous manifestations like hirsutism. * **Spironolactone (C):** This is a potent anti-androgen (aldosterone antagonist) that blocks androgen receptors. While highly effective, it is typically used as a **second-line** add-on therapy if OCPs alone are insufficient after 6 months. It must be used with contraception due to its teratogenic risk (feminization of a male fetus). * **Danazol (D):** This is a synthetic steroid with androgenic properties. It is used in endometriosis but is contraindicated in hirsutism as it can actually **worsen** the condition. **Clinical Pearls for NEET-PG:** * **Timeframe:** Patients must be counseled that it takes **6–12 months** to see clinical improvement due to the long life cycle of hair follicles. * **Combined Therapy:** The combination of OCPs and Spironolactone is more effective than either alone for severe cases. * **Ferriman-Gallwey Score:** A score of **≥8** is generally used to define hirsutism in most populations.

Q: At what level of testosterone should ovarian pathology be searched?

> 10 nmol/L. **Explanation:** The primary objective in evaluating hyperandrogenism is to differentiate between common functional causes (like PCOS) and rare, life-threatening causes (like androgen-secreting tumors). **Why Option D is Correct:** In clinical practice, total testosterone levels are used as a screening marker for ovarian tumors. While the normal range for women is typically 10 nmol/L** (approximately >200 ng/dL) are considered the critical threshold. At this concentration, the likelihood of a functional cause (PCOS) decreases, and the suspicion for an **androgen-secreting ovarian tumor** (e.g., Sertoli-Leydig cell tumor) increases significantly. Such patients require urgent imaging (Transvaginal Ultrasound or MRI) to localize the pathology. **Analysis of Incorrect Options:** * **Options A, B, and C:** These levels (4, 6, and 8 nmol/L) represent moderate elevations. While these values are higher than normal and are frequently seen in severe cases of Polycystic Ovary Syndrome (PCOS) or Idiopathic Hirsutism, they do not meet the classic diagnostic "red flag" cutoff used in standard textbooks (like Williams Gynecology) to mandate an immediate search for a neoplastic growth. **High-Yield Clinical Pearls for NEET-PG:** * **Testosterone >10 nmol/L (>200 ng/dL):** Suspect Ovarian Tumor. * **DHEAS >18 µmol/L (>700 µg/dL):** Suspect Adrenal Tumor (e.g., Adrenal Carcinoma). * **Rapid onset of virilization** (clitoromegaly, deepening of voice, male-pattern baldness) is a stronger clinical indicator of malignancy than hirsutism alone. * **First-line investigation** for suspected ovarian pathology is a Transvaginal Ultrasound (TVUS).

Q: Which is the most conclusive sign of ovulation?

Pregnancy. **Explanation:** The goal of ovulation is reproduction. Therefore, **Pregnancy** is the only absolute, 100% conclusive evidence that a viable oocyte was released and successfully fertilized. All other clinical markers are merely "presumptive" or "indirect" indicators of ovulation. **Why the other options are incorrect:** * **Transvaginal Sonography (TVS):** While a follicular study is the most reliable *indirect* method (showing follicular disappearance, internal echoes, or fluid in the Pouch of Douglas), it cannot definitively prove the release of a healthy oocyte. Conditions like **LUFS (Luteinized Unruptured Follicle Syndrome)** can mimic ovulation on ultrasound where the follicle luteinizes but the egg is never released. * **Basal Body Temperature (BBY):** This is a retrospective indicator. The rise in temperature (0.5–1.0°F) is due to the thermogenic effect of progesterone. It confirms luteinization but is easily influenced by infection, stress, or poor sleep. * **Ferning Pattern:** This occurs due to high estrogen levels *prior* to ovulation. Post-ovulation, progesterone causes the "disappearance" of ferning (cellular pattern). Thus, ferning indicates the pre-ovulatory phase, not the act of ovulation itself. **Clinical Pearls for NEET-PG:** * **Most accurate indirect method:** Serial TVS (Folliculometry). * **Best biochemical marker:** Mid-luteal Serum Progesterone (measured on Day 21). A value **>3 ng/ml** suggests ovulation; **>10 ng/ml** is ideal. * **Mittelschmerz sign:** Pelvic pain mid-cycle due to follicular fluid irritating the peritoneum; it is a subjective presumptive sign. * **Spinnbarkeit phenomenon:** Increased elasticity of cervical mucus just before ovulation (estrogen effect).

Q: 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?

Karyotyping. **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.

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

Is thick. 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.

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

Decreased LH levels. **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**.

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

Associated with carcinoma endometrium. **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 1

A 16-year-old girl presents with rapid onset hirsutism and amenorrhea. What is the best investigation?

Accepted Answer

Testosterone estimation

Answer

Dihydroepiandrosterone estimation

Answer

Adrenocorticotropic hormone estimation

Answer

Luteinizing hormone and Follicle-stimulating hormone estimation

Question 2

Withdrawal bleeding with progesterone is seen in an otherwise amenorrheic woman due to which of the following conditions?

Accepted Answer

Anovulation

Answer

Hypogonadotropic hypogonadism

Answer

Ovarian failure

Answer

Tuberculosis endometritis

Question 3

What is the most effective treatment for hirsutism?

Accepted Answer

Low-dose oral contraceptive pills (OCPs)

Answer

Metformin

Answer

Spironolactone

Answer

Danazol

Question 4

Incomplete androgen insensitivity syndrome is characterized by which of the following?

Accepted Answer

Clitoromegaly and partial fusion of labia.

Answer

More severe symptoms than complete androgen insensitivity.

Answer

Absent breast development.

Answer

A 46XX karyotype.

Question 5

At what level of testosterone should ovarian pathology be searched?

Accepted Answer

> 10 nmol/L

Answer

> 4 nmol/L

Answer

> 6 nmol/L

Answer

> 8 nmol/L

Question 6

Which is the most conclusive sign of ovulation?

Accepted Answer

Pregnancy

Answer

Transvaginal sonographic follicular study

Answer

Basal body temperature monitoring

Answer

Ferning pattern of cervical mucus

Question 7

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?

Accepted Answer

Karyotyping

Answer

Buccal smear

Answer

Progesterone withdrawal test

Answer

Gonadal biopsy

Question 8

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

Accepted Answer

Is thick

Answer

Shows a fern pattern on drying

Answer

Is thin and cellular

Answer

Is thin and alkaline

Question 9

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

Accepted Answer

Decreased LH levels

Answer

Increased androgens

Answer

Decreased FSH levels

Answer

Increased GnRH levels

Question 10

Which of the following is true about polycystic ovarian syndrome?

Accepted Answer

Associated with carcinoma endometrium

Answer

Always associated with obesity

Answer

Diabetes insipidus

Answer

Hypoandrogenemia

Reproductive Endocrinology — MCQs

Reproductive Endocrinology — MCQs

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