Reproductive Endocrinology — MCQs

Reproductive Endocrinology Indian Medical PG Practice Questions and MCQs

Question 141: What is the most effective treatment for hirsutism?

A. Metformin
B. Low-dose oral contraceptive pills (OCPs) (Correct Answer)
C. Spironolactone
D. Danazol

Explanation: **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.

Question 142: Incomplete androgen insensitivity syndrome is characterized by which of the following?

A. More severe symptoms than complete androgen insensitivity.
B. Clitoromegaly and partial fusion of labia. (Correct Answer)
C. Absent breast development.
D. A 46XX karyotype.

Explanation: **Explanation:** **Androgen Insensitivity Syndrome (AIS)** is an X-linked recessive condition caused by mutations in the androgen receptor gene. In **Incomplete AIS (PAIS)**, there is partial responsiveness to androgens, leading to a spectrum of masculinization in a genetically male individual (**46,XY**). **Why Option B is Correct:** In PAIS, the partial action of dihydrotestosterone (DHT) during fetal development leads to ambiguous genitalia. This typically manifests as **clitoromegaly** (or a small phallus), **partial fusion of the labioscrotal folds**, and often a urogenital sinus or hypospadias. Unlike the complete form, there is enough androgen signaling to cause some virilization of the external genitalia. **Why Other Options are Incorrect:** * **Option A:** Complete AIS (CAIS) presents with a more "complete" lack of androgen effect, resulting in a phenotypically female appearance. However, in clinical terms, PAIS is often considered more complex to manage due to ambiguous genitalia, but the "severity" of the receptor defect is actually greater in CAIS. * **Option B:** **Breast development is present** (and often significant) in both CAIS and PAIS. This occurs because the testes produce testosterone, which is peripherally converted to estrogen (aromatization), and the lack of androgen action allows estrogen to act unopposed. * **Option D:** The karyotype is **46,XY**. These individuals have functioning testes (usually undescended) that produce normal male levels of testosterone and Anti-Müllerian Hormone (AMH). **High-Yield Clinical Pearls for NEET-PG:** * **Müllerian Structures:** Absent in both CAIS and PAIS (due to normal AMH production by testes). Therefore, there is no uterus or fallopian tubes. * **Pubic/Axillary Hair:** Scant or absent in CAIS; may be present (though sparse) in PAIS. * **Management:** Includes gonadectomy (due to risk of gonadoblastoma/dysgerminoma) and hormone replacement therapy. In PAIS, gender assignment is a critical multidisciplinary decision.

Question 143: A 30-year-old woman presented with secondary amenorrhea for 3 years along with galactorrhea. What is the most likely cause of her symptoms?

A. Craniopharyngioma
B. Prolactinoma (Correct Answer)
C. Meningioma
D. Sub-arachnoid hemorrhage

Explanation: **Explanation:** The clinical presentation of **secondary amenorrhea** combined with **galactorrhea** is the classic "Amenorrhea-Galactorrhea Syndrome," which is most commonly caused by **hyperprolactinemia**. **Why Prolactinoma is correct:** A prolactinoma (a pituitary adenoma) is the most common secretory tumor of the pituitary gland. Elevated prolactin levels inhibit the pulsatile release of **GnRH** from the hypothalamus. This leads to decreased secretion of FSH and LH, resulting in hypogonadotropic hypogonadism (amenorrhea). Simultaneously, high prolactin levels directly stimulate the mammary glands to produce milk, causing galactorrhea. **Why other options are incorrect:** * **Craniopharyngioma:** While these suprasellar tumors can cause hyperprolactinemia by compressing the pituitary stalk (the "stalk effect" which blocks dopamine, the prolactin-inhibiting factor), they typically present with visual field defects (bitemporal hemianopia) and growth retardation in younger patients. They are less common causes of this specific syndrome than prolactinomas. * **Meningioma:** These are usually benign tumors arising from the meninges. Unless they occur at the tuberculum sellae and compress the stalk, they do not cause galactorrhea or amenorrhea. * **Sub-arachnoid hemorrhage (SAH):** This is an acute neurosurgical emergency presenting with a "thunderclap headache," vomiting, and altered sensorium. It does not present with chronic endocrine symptoms like 3 years of amenorrhea. **High-Yield NEET-PG Pearls:** * **First-line investigation:** Serum Prolactin levels (Normal <25 ng/ml). * **Gold standard imaging:** MRI of the Brain with contrast (focusing on the Sella turcica). * **Drug of choice:** **Cabergoline** (a dopamine agonist) is preferred over Bromocriptine due to better efficacy and fewer side effects. * **Microprolactinoma:** <10 mm; **Macroprolactinoma:** >10 mm.

Question 144: The Cornification Index or eosinophilic index indicates which of the following?

A. The effect of progesterone
B. The effect of estrogen (Correct Answer)
C. The effect of LH
D. All of the above

Explanation: The **Cornification Index (CI)**, also known as the **Eosinophilic Index**, is a cytological measure used to assess the hormonal status of the vaginal epithelium. ### **Explanation of the Correct Answer** **Estrogen** is the primary hormone responsible for the proliferation and maturation of the vaginal squamous epithelium. Under the influence of estrogen, vaginal cells mature from parabasal to intermediate and finally to **superficial cells**. * **Superficial cells** are characterized by pyknotic nuclei and acidophilic (eosinophilic) cytoplasm. * The Cornification Index is the percentage of these mature, acidophilic superficial cells compared to all other squamous cells. * Therefore, a high Cornification Index directly reflects high **estrogen activity**, reaching its peak during the ovulatory phase. ### **Why Other Options are Incorrect** * **Progesterone (Option A):** Progesterone opposes the effects of estrogen on the vaginal mucosa. It causes "clumping" of cells and promotes the presence of **intermediate cells** (cyanophilic cells with vesicular nuclei) rather than superficial cells. The index associated with progesterone is the **Karyopyknotic Index (KPI)**, which decreases in the luteal phase. * **LH (Option C):** Luteinizing Hormone triggers ovulation but does not have a direct, measurable trophic effect on the vaginal epithelium. Its effects are mediated indirectly through the subsequent production of progesterone by the corpus luteum. ### **High-Yield Clinical Pearls for NEET-PG** * **Maturation Index (MI):** Expressed as a ratio of Parabasal : Intermediate : Superficial cells (e.g., 0/40/60). * **Shift to the Right:** Indicates high estrogen (more superficial cells). * **Shift to the Left:** Indicates estrogen deficiency (more parabasal cells), commonly seen in prepubertal girls or postmenopausal women. * **Fern Test:** Another test for estrogen; high estrogen causes "ferning" of cervical mucus, while progesterone disappears it (cellular pattern).

Question 145: At what level of testosterone should ovarian pathology be searched?

A. > 4 nmol/L
B. > 6 nmol/L
C. > 8 nmol/L
D. > 10 nmol/L (Correct Answer)

Explanation: **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 <2.5 nmol/L, levels **>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).

Question 146: All of the following hormonal observations in PCOD are true, except?

A. High LH/FSH ratio
B. High androgens
C. High prolactin (Correct Answer)
D. High LH

Explanation: **Explanation:** Polycystic Ovarian Disease (PCOD/PCOS) is primarily a disorder of **hyperandrogenism** and **gonadotropin dysregulation**. **Why "High Prolactin" is the correct answer (The Exception):** In PCOD, the hallmark is an increased frequency of GnRH pulses, which favors the secretion of LH over FSH. While a mild elevation in prolactin (mild hyperprolactinemia) can be seen in approximately 10–15% of PCOS cases due to chronic estrogen stimulation of lactotrophs, it is **not** a diagnostic or consistent hormonal observation of the syndrome. In the context of this MCQ, the other three options represent the classic "Rotterdam" or biochemical profile of PCOD, making "High Prolactin" the odd one out. **Analysis of Incorrect Options:** * **High LH & High LH/FSH ratio:** Due to increased GnRH pulse frequency, there is preferential secretion of LH. Traditionally, an **LH:FSH ratio > 2:1 or 3:1** was used for diagnosis. While no longer a strict Rotterdam criterion, it remains a classic high-yield finding. * **High Androgens:** This is a core feature. Increased LH stimulates the **Ovarian Theca cells** to produce excess androgens (Androstenedione and Testosterone), leading to hirsutism and acne. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Rotterdam Criteria (2 out of 3: Clinical/biochemical hyperandrogenism, Oligo/anovulation, Polycystic ovaries on USG). * **Insulin Resistance:** A key driver; hyperinsulinemia decreases **SHBG** (Sex Hormone Binding Globulin), further increasing "Free Testosterone" levels. * **Estrone (E1):** In PCOD, peripheral conversion of androgens in adipose tissue leads to high **Estrone** levels, increasing the risk of endometrial hyperplasia. * **Best Initial Test:** Total Testosterone; **Most Sensitive Test:** Free Testosterone.

Question 147: What is the most common parental chromosomal abnormality associated with recurrent abortion?

A. Robertsonian translocations (Correct Answer)
B. Trisomy
C. Microdeletions
D. Mosaicism

Explanation: **Explanation:** Recurrent Pregnancy Loss (RPL) is defined as two or more consecutive pregnancy losses. While the most common cause of *sporadic* miscarriage is fetal aneuploidy (Trisomy), the most common **parental** chromosomal abnormality identified in couples with RPL is a balanced translocation. **1. Why Robertsonian Translocation is Correct:** Among parental chromosomal rearrangements, **Balanced Translocations** are the most frequent. These are divided into Reciprocal and Robertsonian translocations. While some textbooks debate which is more frequent, **Robertsonian translocations** (involving acrocentric chromosomes like 13, 14, 15, 21, and 22) are a classic high-yield answer for parental causes. In these cases, the parent is phenotypically normal but produces unbalanced gametes, leading to embryos with lethal monosomies or trisomies, resulting in miscarriage. **2. Why Other Options are Incorrect:** * **Trisomy:** This is the most common chromosomal cause of **sporadic** (isolated) spontaneous abortion (specifically Trisomy 16), but it is a fetal error, not a parental structural abnormality. * **Microdeletions:** These are usually associated with specific genetic syndromes (e.g., DiGeorge) rather than being the primary "most common" cause of recurrent early pregnancy loss. * **Mosaicism:** While parental mosaicism can occur, it is significantly less common than balanced structural translocations in the context of RPL. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of sporadic abortion:** Fetal Aneuploidy (Trisomy 16 is the most common specific trisomy). * **Most common parental factor in RPL:** Balanced Translocations (found in 2-5% of couples). * **Investigation of choice:** Peripheral blood **Karyotyping** of both parents. * **Management:** Genetic counseling and Preimplantation Genetic Testing (PGT) if necessary.

Question 148: Which is the most conclusive sign of ovulation?

A. Transvaginal sonographic follicular study
B. Basal body temperature monitoring
C. Ferning pattern of cervical mucus
D. Pregnancy (Correct Answer)

Explanation: **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).

Question 149: Which of the following syndromes is associated with anosmia?

A. Kallmann's syndrome (Correct Answer)
B. Turner's syndrome
C. Down's syndrome
D. Klinefelter's syndrome

Explanation: **Explanation:** **Kallmann’s Syndrome** is the correct answer because it is a form of **Hypogonadotropic Hypogonadism (HH)** characterized by the failure of GnRH-secreting neurons to migrate from the olfactory placode to the hypothalamus during embryonic development. Since these neurons migrate alongside the olfactory nerves, their failure to reach the hypothalamus results in both GnRH deficiency (leading to delayed puberty and primary amenorrhea) and **anosmia** (total loss of smell) or hyposmia. **Why other options are incorrect:** * **Turner’s Syndrome (45,XO):** This is a form of *Hypergonadotropic Hypogonadism* caused by streak ovaries. While it presents with primary amenorrhea and short stature, it is not associated with olfactory defects. * **Down’s Syndrome (Trisomy 21):** This is a chromosomal disorder characterized by intellectual disability and specific dysmorphic features (e.g., flat nasal bridge, epicanthal folds), but anosmia is not a diagnostic feature. * **Klinefelter’s Syndrome (47,XXY):** This affects males, leading to small firm testes and infertility. While it involves hypogonadism, it is *hypergonadotropic* in nature and does not involve the olfactory system. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Most commonly X-linked recessive (KAL1 gene mutation), but can be Autosomal Dominant or Recessive. * **Hormonal Profile:** Low GnRH → Low FSH/LH → Low Estrogen/Testosterone (Hypo-Hypo). * **Associated Findings:** Cleft lip/palate, renal agenesis, and mirror movements (synkinesis). * **Diagnosis:** MRI may show absent or hypoplastic olfactory bulbs. * **Treatment:** Pulsatile GnRH or gonadotropin therapy is used to induce ovulation/fertility.

Question 150: Precocious puberty may be seen in all of the following conditions except:

A. Granulosa cell tumor
B. Head injury
C. Corticosteroid intake
D. Hyperthyroidism (Correct Answer)

Explanation: **Explanation:** Precocious puberty is defined as the onset of secondary sexual characteristics before the age of 8 in girls and 9 in boys. It is categorized into **GnRH-dependent (Central)** and **GnRH-independent (Peripheral)** types. **Why Hyperthyroidism is the correct answer:** Hyperthyroidism is **not** typically associated with precocious puberty. In fact, it is **Hypothyroidism** (specifically severe, untreated primary hypothyroidism) that causes precocious puberty (Van Wyk-Grumbach Syndrome). In primary hypothyroidism, high levels of TSH can cross-react with FSH receptors due to molecular mimicry (both share a common alpha subunit), leading to follicular development and early puberty. **Analysis of other options:** * **Granulosa cell tumor:** This is a common cause of **Peripheral Precocious Puberty**. These tumors secrete estrogen directly, leading to breast development and uterine bleeding without the activation of the Hypothalamic-Pituitary-Gonadal (HPG) axis. * **Head injury:** Any CNS insult, including trauma, tumors (Hamartomas), or infections, can trigger the premature activation of the HPG axis, leading to **Central Precocious Puberty**. * **Corticosteroid intake:** Exogenous administration of steroid hormones (or accidental ingestion of estrogen-containing creams/medications) can mimic endogenous sex steroids, leading to the development of secondary sexual characteristics (Peripheral type). **High-Yield Clinical Pearls for NEET-PG:** * **McCune-Albright Syndrome:** Triad of Polyostotic fibrous dysplasia, Café-au-lait spots (Coast of Maine), and Peripheral precocious puberty. * **Most common cause of Central Precocious Puberty:** Idiopathic (80-90% in girls). * **Bone Age:** Always advanced in precocious puberty; essential for diagnosis. * **Treatment:** GnRH agonists (e.g., Leuprolide) are the gold standard for Central Precocious Puberty to prevent premature epiphyseal closure and short stature.

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

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