Reproductive Endocrinology — MCQs

Reproductive Endocrinology Indian Medical PG Practice Questions and MCQs

Question 251: An 18-year-old female presents with primary amenorrhea. Her height is normal but she has no secondary sexual characteristics. What is the most likely diagnosis?

A. Turner syndrome
B. Swyer syndrome
C. Kallmann syndrome (Correct Answer)
D. Klinefelter syndrome

Explanation: ### Explanation **Correct Answer: C. Kallmann Syndrome** The clinical presentation of **primary amenorrhea** with **absent secondary sexual characteristics** and **normal height** points toward **Hypogonadotropic Hypogonadism**. In Kallmann syndrome, there is a failure of GnRH-secreting neurons to migrate from the olfactory placode to the hypothalamus. This results in low GnRH, low FSH/LH, and consequently, low estrogen levels. Because estrogen is required for breast development and the pubertal growth spurt, these patients lack secondary sexual characteristics. However, unlike Turner syndrome, their linear growth continues (often resulting in a normal or eunuchoid tall stature) because the epiphyses do not fuse early due to estrogen deficiency. **Why other options are incorrect:** * **Turner Syndrome (45,XO):** While it presents with primary amenorrhea and absent secondary sexual characteristics (Hypergonadotropic Hypogonadism), the hallmark feature is **short stature** and associated stigmata (webbed neck, shield chest). * **Swyer Syndrome (46,XY Pure Gonadal Dysgenesis):** These patients have streak gonads and present with primary amenorrhea and female phenotype. While they are usually **tall**, it is a less common cause than Kallmann in general presentations unless "XY genotype" is specified. * **Klinefelter Syndrome (47,XXY):** This affects **males**. It presents with small testes, infertility, and gynecomastia, not primary amenorrhea. **NEET-PG High-Yield Pearls:** * **Pathognomonic sign:** Anosmia or hyposmia (due to olfactory bulb hypoplasia). * **Genetics:** Most common inheritance is X-linked recessive (KAL-1 gene). * **Diagnostic Clue:** Low FSH/LH + Low Estrogen + Normal/Tall height + Anosmia = Kallmann Syndrome. * **Management:** Pulsatile GnRH therapy or gonadotropins are used to induce puberty and fertility.

Question 252: In Testicular Feminization syndrome, gonadectomy is indicated:

A. As soon as it is diagnosed
B. At puberty (Correct Answer)
C. Only when malignancy develops in it
D. When hirsutism is evident

Explanation: **Explanation:** **Testicular Feminization Syndrome (Androgen Insensitivity Syndrome - AIS)** is an X-linked recessive condition where a 46,XY individual has a functional loss of androgen receptors. This results in a female phenotype with undescended testes. **Why Option B is Correct:** In AIS, the undescended testes produce high levels of testosterone, which is peripherally converted to estrogen via aromatization. This endogenous estrogen is crucial for achieving **spontaneous secondary sexual characteristics** (breast development and female body habitus) and a natural pubertal growth spurt. Therefore, gonadectomy is delayed until **after puberty** (usually ages 16–18) to allow for natural feminization without the need for exogenous hormone replacement during the teenage years. **Why Other Options are Incorrect:** * **Option A:** Performing surgery as soon as diagnosed (pre-puberty) would necessitate lifelong estrogen replacement therapy to induce puberty and prevent osteoporosis. * **Option C:** While the risk of malignancy (Gonadoblastoma/Dysgerminoma) is the primary reason for gonadectomy, waiting until it develops is dangerous. The risk is low (<2%) before puberty but increases significantly (up to 25-30%) in adulthood. * **Option D:** Hirsutism does not occur in AIS because the androgen receptors are non-functional; these patients typically have absent or scanty pubic and axillary hair. **High-Yield Clinical Pearls for NEET-PG:** * **Karyotype:** 46, XY (Genetically male, Phenotypically female). * **Clinical Features:** Primary amenorrhea, blind-ending vagina, absent uterus/ovaries (due to Anti-Müllerian Hormone action), and scant pubic hair. * **Malignancy Risk:** The risk of germ cell tumors is low before age 20, justifying the delay in surgery. * **Post-Op Care:** After gonadectomy, patients require **Estrogen replacement** to prevent menopausal symptoms and maintain bone mineral density.

Question 253: Ferning of cervical mucus disappears after which day of the menstrual cycle?

A. 7th
B. 15th
C. 18th
D. 21st (Correct Answer)

Explanation: **Explanation:** The appearance and disappearance of cervical mucus ferning are governed by the hormonal interplay between **Estrogen** and **Progesterone**. 1. **The Mechanism (Why 21st is correct):** Ferning (arborization) is caused by the crystallization of sodium chloride in cervical mucus under the influence of high estrogen levels. This process peaks at ovulation (Day 14). Post-ovulation, the corpus luteum produces **Progesterone**, which alters the chemical composition of the mucus, making it thick, cellular, and low in sodium chloride. This "anti-estrogenic" effect of progesterone inhibits crystallization. Ferning typically begins to diminish immediately after ovulation and **completely disappears by Day 21** of a standard 28-day cycle. 2. **Analysis of Incorrect Options:** * **7th Day:** This is the early follicular phase. Estrogen levels are just beginning to rise; ferning is usually absent or minimal at this stage. * **15th Day:** This is the immediate post-ovulatory period. While progesterone is rising, residual ferning may still be visible. * **18th Day:** Progesterone levels are significant, but the complete transition of mucus characteristics often takes a few more days to reach the point of total disappearance. **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 due to high estrogen. * **Palm Leaf Pattern:** Another name for the ferning pattern seen under a microscope. * **Clinical Use:** The disappearance of ferning is a simple, indirect indicator that ovulation has occurred (progesterone effect). If ferning persists throughout the cycle, it suggests **anovulation** (persistent estrogen without progesterone).

Question 254: In the presence of secondary sexual characters, at what age is screening for primary amenorrhea typically performed?

A. 12 years
B. 14 years
C. 16 years (Correct Answer)
D. 18 years

Explanation: ### Explanation Primary amenorrhea is defined based on the presence or absence of secondary sexual characteristics (thelarche/breast development), which serves as a clinical marker for endogenous estrogen production and a functional Hypothalamic-Pituitary-Ovarian (HPO) axis. **1. Why 16 years is the correct answer:** According to standard clinical guidelines (ACOG), primary amenorrhea is diagnosed if a girl has **not reached menarche by age 16**, provided she has **normal development of secondary sexual characteristics**. The presence of these characters suggests that the HPO axis is active and producing estrogen; therefore, clinicians wait longer to allow for the natural onset of menstruation. **2. Analysis of Incorrect Options:** * **12 years (A):** This is the average age of menarche in most populations, but not the threshold for pathology. * **14 years (B):** This is the diagnostic cutoff for primary amenorrhea **only if secondary sexual characteristics are absent**. If there is no breast development by age 14, it indicates a potential HPO axis failure or gonadal dysgenesis, requiring earlier investigation. * **18 years (D):** This is outdated criteria. Waiting until 18 can delay the diagnosis of anatomical obstructions (like imperforate hymen) or genetic conditions. **3. Clinical Pearls for NEET-PG:** * **Rule of 14 & 16:** No secondary sexual characters + No menses = **14 years**. Secondary sexual characters present + No menses = **16 years**. * **Initial Investigation:** The first step in evaluation is often a **Physical Examination** (to check for patent outflow tract) followed by a **Pelvic Ultrasound** (to confirm the presence or absence of the uterus). * **Most Common Cause:** Turner Syndrome (45,XO) is the most common cause of primary amenorrhea with absent secondary sexual characters (Hypergonadotropic Hypogonadism). * **Müllerian Agenesis (MRKH):** The most common cause of primary amenorrhea with normal secondary sexual characters and an absent uterus.

Question 255: Characteristic features of Rokitansky-Kuster-Hauser syndrome include all of the following except:

A. Absent uterus
B. Absent vagina
C. Anovulation (Correct Answer)
D. 46, XX karyotype

Explanation: **Explanation:** Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome is a congenital anomaly characterized by **Müllerian agenesis**. The core defect is the failure of the Müllerian ducts to develop, which normally give rise to the fallopian tubes, uterus, and the upper two-thirds of the vagina. **Why Anovulation is the correct answer:** In MRKH syndrome, the defect is strictly anatomical (Müllerian). The **ovaries develop from the primitive germ cells** (not the Müllerian ducts), meaning ovarian function remains entirely intact. Patients have normal follicular development, regular ovulation, and normal female levels of estrogen and progesterone. Therefore, "Anovulation" is the incorrect feature. **Analysis of other options:** * **Absent uterus & Absent vagina:** These are hallmark features. Due to Müllerian duct aplasia, the uterus and the upper 2/3rd of the vagina are absent or rudimentary. * **46, XX karyotype:** Patients are genetically female with a normal female karyotype. This distinguishes MRKH from Androgen Insensitivity Syndrome (AIS), which presents with a 46, XY karyotype. **High-Yield Clinical Pearls for NEET-PG:** * **Presentation:** Primary amenorrhea in a girl with normal secondary sexual characters (as ovaries are functional). * **Associated Anomalies:** Renal anomalies (e.g., renal agenesis, ectopic kidney) are seen in 40% of cases; skeletal anomalies (e.g., Klippel-Feil syndrome) are also common. * **Diagnosis:** MRI is the gold standard for visualizing pelvic anatomy; Ultrasound is the initial screening tool. * **Treatment:** Non-surgical (Frank’s dilators) or surgical (McIndoe vaginoplasty) creation of a neovagina. Pregnancy is possible only via surrogacy (as they have no uterus but produce viable oocytes).

Question 256: All of the following are associated with polycystic ovarian syndrome, EXCEPT:

A. Ovarian carcinoma
B. Ovarian carcinoma
C. Insulin Resistance
D. Osteoporosis (Correct Answer)

Explanation: **Explanation:** Polycystic Ovarian Syndrome (PCOS) is a state of **hyperestrogenism** and **hyperandrogenism** due to chronic anovulation. **Why Osteoporosis is the Correct Answer:** Osteoporosis is characterized by low bone mineral density. Estrogen is a bone-protective hormone that inhibits osteoclast activity. In PCOS, there is a continuous production of estrone (via peripheral conversion of androstenedione) and lack of progesterone. This **hyperestrogenic state actually increases bone mineral density**, making osteoporosis a finding *not* associated with PCOS. In contrast, conditions like premature ovarian failure or menopause (estrogen deficiency) lead to osteoporosis. **Analysis of Other Options:** * **Endometrial & Ovarian Carcinoma:** Chronic anovulation leads to "unopposed estrogen" action on the endometrium, significantly increasing the risk of **Endometrial Carcinoma**. There is also a moderately increased risk of **Ovarian Cancer** (specifically epithelial types), likely due to chronic inflammation and hormonal imbalances. * **Insulin Resistance:** This is a hallmark pathophysiological feature of PCOS (found in both obese and lean phenotypes). It leads to compensatory hyperinsulinemia, which stimulates ovarian theca cells to produce androgens and decreases Sex Hormone Binding Globulin (SHBG), worsening hirsutism. **NEET-PG High-Yield Pearls:** * **LH:FSH Ratio:** Classically >2:1 or 3:1 (though no longer a diagnostic criterion in Rotterdam's). * **Rotterdam Criteria (2 out of 3):** 1. Oligo/Anovulation, 2. Clinical/Biochemical Hyperandrogenism, 3. Polycystic ovaries on USG (≥12 follicles or volume >10ml). * **DOC for Infertility:** Letrozole (Aromatase inhibitor) is now the first-line agent for ovulation induction, surpassing Clomiphene Citrate. * **Metabolic Syndrome:** PCOS patients are at high risk for Type 2 Diabetes and Cardiovascular disease.

Question 257: What is the microscopic finding of cervical mucus during the post-ovulatory period?

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

Explanation: **Explanation:** The correct answer is **A. Shows ferning pattern on drying**. **Underlying Medical Concept:** Cervical mucus characteristics are governed by the hormonal balance of the menstrual cycle. During the **pre-ovulatory (follicular) phase**, rising levels of **Estrogen** cause the cervical mucus to become thin, watery, alkaline, and rich in sodium chloride. When this mucus is spread on a glass slide and allowed to air-dry, the high salt concentration crystallizes in a characteristic palm-leaf or **"ferning" pattern**. This reaches its peak just before ovulation, facilitating sperm penetration. **Analysis of Options:** * **Option B (Is thick):** This is incorrect for the pre-ovulatory phase. Thick, tenacious, and viscous mucus is a feature of the **post-ovulatory (luteal) phase**, driven by **Progesterone**, which acts as a barrier to sperm. * **Option C (Is thin and cellular):** While the mucus is thin, it is notably **acellular** (or contains very few cells) during the pre-ovulatory period. High cellularity is a feature of the progesterone-dominant phase. * **Option D (Is thin and alkaline):** While pre-ovulatory mucus is indeed thin and alkaline, the question specifically asks for the **microscopic finding**. Ferning is the definitive microscopic hallmark, whereas alkalinity is a chemical property. **NEET-PG High-Yield Pearls:** 1. **Spinnbarkeit Test:** Refers to the "stretchability" of cervical mucus. In the pre-ovulatory phase, it can be stretched 8–10 cm. 2. **Progesterone Effect:** Progesterone inhibits ferning. The disappearance of ferning after mid-cycle is a presumptive sign that ovulation has occurred. 3. **Acellularity:** Pre-ovulatory mucus is clear and acellular; the presence of many leukocytes usually indicates cervicitis or the luteal phase.

Question 258: A young woman presents with delayed menstrual cycles and abnormal growth of facial hair. Ultrasonography of the ovaries is normal. What is the most probable diagnosis?

A. Idiopathic hirsutism
B. Polycystic Ovarian Disease (PCOD) (Correct Answer)
C. Testosterone-secreting tumor
D. Adrenal hyperplasia

Explanation: **Explanation:** The diagnosis of **Polycystic Ovarian Disease (PCOD/PCOS)** is primarily clinical and biochemical. According to the **Revised Rotterdam Criteria**, a diagnosis requires at least two of the following three features: 1. **Oligomenorrhea/Anovulation** (Delayed menstrual cycles). 2. **Hyperandrogenism** (Clinical, e.g., hirsutism, or biochemical). 3. **Polycystic Ovaries on Ultrasound** (≥12 follicles or increased volume). In this case, the patient satisfies the first two criteria (delayed cycles and facial hair). Crucially, **normal ultrasonography does not exclude PCOD**, as up to 20–30% of women with PCOS may have normal-appearing ovaries on imaging. **Analysis of Incorrect Options:** * **Idiopathic Hirsutism:** Characterized by hirsutism with **regular** menstrual cycles and normal androgen levels. The presence of delayed cycles here points toward an ovulatory disorder like PCOD. * **Testosterone-secreting tumor:** These typically present with **virilization** (clitoromegaly, deepening of voice) and a very rapid onset of symptoms, rather than simple delayed cycles. * **Adrenal Hyperplasia (NCCAH):** While it mimics PCOD, it is less common. PCOD remains the most probable diagnosis for the combination of oligomenorrhea and hirsutism in a young woman. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Rotterdam Criteria (2 out of 3). * **LH:FSH Ratio:** Classically 3:1 (though no longer a formal diagnostic criterion). * **Best Initial Test:** Serum free testosterone (elevated). * **USG Hallmark:** "String of pearls" appearance (subcapsular follicles). * **Treatment of choice for Hirsutism in PCOD:** Combined Oral Contraceptive Pills (OCPs).

Question 259: Pulsatile Gonadotropin-Releasing Hormone (GnRH) is used for managing which condition?

A. Precocious puberty
B. Uterine fibroids
C. Dysfunctional uterine bleeding (DUB)
D. Anovulatory infertility (Correct Answer)

Explanation: ### Explanation The physiological secretion of **Gonadotropin-Releasing Hormone (GnRH)** from the hypothalamus is **pulsatile**. This pulsatility is essential for the stimulation of the anterior pituitary to release FSH and LH, which in turn drive follicular development and ovulation. **1. Why D is Correct:** In cases of **Anovulatory Infertility** (specifically WHO Group I, such as hypothalamic amenorrhea), the primary defect is a lack of endogenous GnRH pulses. Administering GnRH in a **pulsatile manner** (usually via a portable infusion pump every 60–90 minutes) mimics the natural rhythm, restores the pituitary-ovarian axis, and induces ovulation. **2. Why the other options are Incorrect:** * **A, B, and C:** These conditions require the **suppression** of the pituitary-ovarian axis. While GnRH agonists are used for Precocious Puberty, Uterine Fibroids, and DUB, they are administered in a **continuous (non-pulsatile)** fashion. Continuous administration leads to "downregulation" and "desensitization" of GnRH receptors, causing a state of hypogonadotropic hypogonadism (medical oophorectomy). **3. High-Yield Clinical Pearls for NEET-PG:** * **The "Flare" Effect:** Initial administration of a GnRH agonist causes a transient rise in FSH/LH before downregulation occurs. * **GnRH Antagonists:** Unlike agonists, these cause immediate suppression without the initial flare (commonly used in IVF protocols). * **Diagnostic Use:** The "GnRH Stimulation Test" is the gold standard to differentiate between Central (GnRH-dependent) and Peripheral Precocious Puberty. * **Safety:** Pulsatile GnRH therapy has a lower risk of Multiple Pregnancy and Ovarian Hyperstimulation Syndrome (OHSS) compared to gonadotropin injections.

Question 260: Ferning of cervical mucus depends on:

A. Estrogen (Correct Answer)
B. Progesterone
C. LH
D. FSH

Explanation: **Explanation:** The phenomenon of **ferning** (arborization) of cervical mucus is a classic indicator of high **estrogen** levels. Under the influence of estrogen during the follicular phase, cervical mucus becomes thin, watery, and alkaline. Most importantly, estrogen increases the concentration of **sodium chloride (NaCl)** in the mucus. When this mucus is spread on a glass slide and allowed to air-dry, the high salt content crystallizes, forming a characteristic microscopic pattern resembling fern leaves. **Analysis of Options:** * **A. Estrogen (Correct):** Estrogen promotes the secretion of "Type E" mucus, which is rich in electrolytes (NaCl), leading to the ferning pattern. This peaks just before ovulation. * **B. Progesterone:** Progesterone (dominant in the luteal phase) has the opposite effect. It makes the mucus thick, cellular, and acidic, and decreases salt concentration. This inhibits ferning, a phenomenon known as the "progestational effect." * **C & D. LH and FSH:** While these gonadotropins regulate the production of estrogen and progesterone from the ovaries, they do not have a direct biochemical effect on the crystallization properties of cervical mucus. **High-Yield Clinical Pearls for NEET-PG:** * **Spinnbarkeit Effect:** Also caused by estrogen; it refers to the elasticity of cervical mucus (ability to be stretched 8–10 cm) during the periovulatory period. * **Palm Leaf Pattern:** Another name for the ferning pattern. * **Clinical Use:** Ferning is used to predict ovulation, assess estrogen deficiency, or detect the premature rupture of membranes (as amniotic fluid also ferns). * **Disappearance of Ferning:** If ferning disappears after the 21st day of a menstrual cycle, it is a positive sign that ovulation has occurred (due to the rise in progesterone).

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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