Reproductive Endocrinology Practice Questions

Q: Moebius syndrome in a fetus occurs due to maternal intake of which of the following teratogens?

Misoprostol. **Explanation:** **Misoprostol** is a synthetic prostaglandin E1 (PGE1) analogue frequently used for medical abortion and labor induction. When used unsuccessfully for first-trimester abortion, it is associated with a specific pattern of malformations known as **Moebius Syndrome**. **Pathophysiology:** The underlying mechanism is **Vascular Disruption**. Misoprostol causes intense uterine contractions, leading to transient uterine ischemia and fetal hypoxia. This disrupts the development of the cranial nerve nuclei (specifically CN VI and VII) and limb buds. Moebius syndrome is clinically characterized by congenital facial paralysis and impaired ocular abduction, often accompanied by limb defects (like clubfoot). **Analysis of Incorrect Options:** * **Mifepristone (A):** An anti-progestogen used in medical abortion. While it is the first step in the regimen, it is not specifically linked to Moebius syndrome. * **Diethylstilbestrol (DES) (C):** A synthetic estrogen formerly used to prevent miscarriages. It is classically associated with **Clear Cell Adenocarcinoma of the vagina** and T-shaped uterine anomalies in the female offspring (DES daughters). * **Methotrexate (D):** A folate antagonist. Exposure in the first trimester leads to **Fetal Methotrexate Syndrome**, characterized by craniosynostosis, wide-set eyes (hypertelorism), and limb abnormalities, but not the specific cranial nerve palsies of Moebius syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Misoprostol triad:** Moebius syndrome, Terminal transverse limb defects, and Equinovarus (clubfoot). * **Safe use:** Misoprostol is safe for labor induction at term in appropriate doses; the teratogenic risk is specific to failed early pregnancy termination. * **Other Vascular Disruption defects:** Gastroschisis and intestinal atresia are also linked to early pregnancy vascular insults (e.g., cocaine or nicotine).

Q: A female patient presents with secondary amenorrhea and a serum prolactin level of 75 ng/ml. What is the most appropriate treatment?

Cabergoline. ### Explanation **Correct Answer: A. Cabergoline** The patient presents with **secondary amenorrhea** and **hyperprolactinemia** (Prolactin >25 ng/ml). Elevated prolactin levels inhibit the pulsatile release of GnRH from the hypothalamus, leading to decreased FSH and LH, which results in anovulation and amenorrhea. **Cabergoline** is a long-acting **Dopamine Agonist** with a high affinity for D2 receptors. Since dopamine is the primary physiological inhibitor of prolactin secretion, dopamine agonists are the first-line treatment for hyperprolactinemia (both idiopathic and prolactinomas). Cabergoline is preferred over Bromocriptine due to its superior efficacy and better side-effect profile (less nausea/dizziness). **Why Incorrect Options are Wrong:** * **B. Ganirelix:** This is a GnRH antagonist used primarily in IVF cycles to prevent premature LH surges. It would further suppress the reproductive axis. * **C. Clomiphene:** A Selective Estrogen Receptor Modulator (SERM) used for ovulation induction. While it treats infertility, it does not address the underlying cause (hyperprolactinemia) and is usually ineffective until prolactin levels are normalized. * **D. Estradiol:** This is used for hormone replacement therapy (HRT). While it may induce withdrawal bleeding, it does not treat the hyperprolactinemia and can potentially stimulate prolactin-secreting cells. **High-Yield NEET-PG Pearls:** * **Normal Prolactin:** 100 ng/ml, an MRI of the sella turcica is mandatory to rule out a prolactinoma.

Q: A 20-year-old young girl presents with a history of rapidly developing hirsutism and amenorrhea with a change in voice. Which of the following blood tests would you perform to establish a diagnosis?

Testosterone. ### Explanation The clinical presentation of **rapidly developing hirsutism**, **amenorrhea**, and **virilization** (deepening of voice) in a young woman is a "red flag" for an **androgen-secreting tumor**. **1. Why Testosterone is the correct answer:** In cases of rapid-onset virilization, the primary goal is to rule out a tumor of the ovary or adrenal gland. **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). While DHEAS is used to screen for adrenal tumors, Testosterone is the more common and sensitive marker for the potent androgens causing frank virilization like voice changes. **2. Why other options are incorrect:** * **17-OH Progesterone:** This is the screening test for **Congenital Adrenal Hyperplasia (CAH)**. While CAH causes hirsutism, it is usually present from childhood/puberty and rarely presents with such a sudden, rapid onset of virilization in a 20-year-old. * **DHEA/DHEAS:** DHEAS is a marker for **adrenal** sources of androgens. While it would be measured if an adrenal tumor (like Adrenal Carcinoma) was suspected (levels >7000–8000 µg/dL), Testosterone remains the broader initial step to identify significant hyperandrogenism. * **LH + FSH estimation:** These are used to diagnose PCOS (LH:FSH ratio >2:1) or Premature Ovarian Failure. PCOS causes *gradual* hirsutism and rarely causes voice changes or clitoromegaly. **Clinical Pearls for NEET-PG:** * **Gradual onset + Obesity + Irregular periods:** Think **PCOS** (Most common cause of hirsutism). * **Rapid onset + Virilization (Voice change/Clitoromegaly):** Think **Androgen-secreting tumor**. * **Testosterone >200 ng/dL:** Suspect Ovarian Tumor (Sertoli-Leydig). * **DHEAS >7000 µg/dL:** Suspect Adrenal Tumor. * **Ferriman-Gallwey Score:** Used to clinically quantify hirsutism (Score ≥8 is significant).

Q: The phase of the ovarian cycle can be correlated with all of the following EXCEPT:

Estrous cycle. The ovarian cycle (comprising the follicular and luteal phases) is a physiological process specific to primates, including humans. The correct answer is **D. Estrous cycle**, as it is a distinct reproductive cycle found in non-primate mammals. ### Why "Estrous Cycle" is the Correct Answer: The **Estrous cycle** occurs in animals like dogs, cows, and rodents. Unlike the human menstrual cycle, where the endometrium is shed (menstruation), the endometrium in the estrous cycle is reabsorbed if fertilization does not occur. Furthermore, females are only sexually receptive during the "estrus" (heat) phase, whereas human females can be receptive throughout the cycle. Therefore, the ovarian cycle of a human cannot be correlated with an estrous cycle. ### Why the Other Options are Incorrect: * **A. Endometrial sampling:** The endometrium undergoes predictable changes (proliferative vs. secretory) in response to ovarian steroids (estrogen and progesterone). A biopsy can accurately date the phase of the ovarian cycle. * **B. Vaginal cytology:** The vaginal epithelium is sensitive to hormones. High estrogen (follicular phase) causes an increase in **superficial cells** (high Karyopyknotic Index), while progesterone (luteal phase) increases **intermediate cells**. * **C. Blood hormonal levels:** Measuring FSH, LH, Estradiol, and Progesterone provides a direct correlation. For example, high Progesterone (>3 ng/mL) definitively indicates the luteal phase (post-ovulation). ### NEET-PG High-Yield Pearls: * **Karyopyknotic Index (KI):** The percentage of superficial cells in a vaginal smear; it peaks at ovulation due to maximum estrogen. * **Fern Test:** Estrogen causes cervical mucus to "fern"; Progesterone (luteal phase) disappears this pattern. * **Spinnbarkeit Effect:** Maximum elasticity of cervical mucus occurs just before ovulation (follicular phase).

Q: Which of the following statements regarding prolactin levels is TRUE?

Highest during pregnancy and fall during lactation. **Explanation:** **Understanding Prolactin Dynamics** The correct answer is **B**. During pregnancy, prolactin levels rise progressively, reaching their peak (up to 10–20 times non-pregnant levels) at term. This increase is driven by high levels of circulating **estrogen**, which stimulates the lactotrophs in the anterior pituitary to undergo hyperplasia and hypertrophy. Post-delivery, estrogen levels plummet. In non-breastfeeding women, prolactin returns to baseline within 2–3 weeks. In breastfeeding women, while basal prolactin remains elevated, it gradually **falls** over several months of lactation, though it spikes transiently during each episode of suckling (the neuroendocrine reflex). **Analysis of Incorrect Options:** * **Option A:** Incorrect. Prolactin is at its highest during pregnancy, not lowest. It does not increase *after* delivery; rather, the *action* of prolactin (lactogenesis) begins after delivery once the inhibitory effect of progesterone is removed. * **Option C:** Incorrect. Both pregnancy and lactation are the primary physiological states that significantly alter prolactin secretion. * **Option D:** Incorrect. Prolactin follows a highly predictable physiological pattern in all normal pregnancies. **High-Yield Clinical Pearls for NEET-PG:** * **The Progesterone Paradox:** Even though prolactin is high during pregnancy, milk secretion is inhibited by high **Progesterone** levels. Lactation only begins after the placenta is delivered and progesterone levels drop. * **Amniotic Fluid:** Prolactin is found in high concentrations in amniotic fluid, where it aids in fetal osmoregulation. * **Lactational Amenorrhea:** High prolactin inhibits **GnRH pulsatility**, leading to suppressed FSH/LH and subsequent anovulation. * **Drug of Choice:** For pathological hyperprolactinemia (Prolactinoma), the drug of choice is **Cabergoline** (a dopamine agonist).

Q: What is a primary medical application of Gonadotropin-releasing hormone (GnRH) analogues?

All of the above. ### Explanation The therapeutic utility of **GnRH analogues** (agonists and antagonists) is based on their ability to manipulate the hypothalamic-pituitary-ovarian axis. Their effect depends entirely on the **mode of administration**: * **Pulsatile administration:** Mimics the natural physiological release of GnRH, stimulating the pituitary to release FSH and LH. This is used for **ovulation induction** (Option A) in patients with hypogonadotropic hypogonadism. * **Continuous (Non-pulsatile) administration:** Initially causes a "flare effect," but subsequently leads to **downregulation and desensitization** of GnRH receptors. This results in a state of "pseudomenopause" or medical oophorectomy. This hypoestrogenic state is the cornerstone for treating estrogen-dependent conditions like **Endometriosis** (Option B) and **Uterine Fibroids** (Option C), where it reduces lesion size and symptoms. **Why "All of the above" is correct:** GnRH analogues are versatile. While continuous administration is more common clinically for suppressing estrogen, pulsatile administration remains a valid (though less frequent) method for inducing ovulation. **High-Yield NEET-PG Pearls:** * **Flare Effect:** Occurs in the first 7–10 days of agonist therapy; prevented by using GnRH **antagonists** (e.g., Cetrorelix), which provide immediate suppression. * **Add-back Therapy:** When using GnRH agonists for >6 months (e.g., for endometriosis), low-dose estrogen/progesterone is added to prevent bone mineral density loss and vasomotor symptoms. * **Fibroids:** GnRH analogues are typically used **pre-operatively** for 3 months to reduce tumor volume and correct anemia before myomectomy or hysterectomy.

Q: Which hormone level is most commonly assessed to evaluate ovarian reserve?

Follicle-Stimulating Hormone (FSH). **Explanation:** **Ovarian reserve** refers to the quantity and quality of the remaining oocytes in the ovaries. As a woman ages, the number of follicles decreases, leading to a decline in **Inhibin B** and **Estradiol** levels. Since these hormones normally provide negative feedback to the pituitary, their decline results in a compensatory rise in **Follicle-Stimulating Hormone (FSH)**. **Why FSH is the Correct Answer:** Basal FSH, measured on **Day 2 or 3** of the menstrual cycle, is the traditional "gold standard" screening test for ovarian reserve. A high FSH level (typically >10-12 mIU/mL) indicates a diminished ovarian reserve (DOR), as the pituitary is "working harder" to stimulate the depleted follicles. **Analysis of Incorrect Options:** * **LH (A):** LH levels are primarily used to detect the mid-cycle surge for ovulation or to diagnose PCOS; they do not independently reflect the oocyte pool. * **LH/FSH Ratio (B):** An elevated ratio (>2:1 or 3:1) is a classic diagnostic marker for **Polycystic Ovary Syndrome (PCOS)**, not ovarian reserve. * **Estradiol (D):** While often measured alongside FSH, isolated estradiol is not a reliable marker. However, a very high early-cycle estradiol (>60-80 pg/mL) can falsely suppress FSH, masking a diminished reserve. **High-Yield NEET-PG Pearls:** * **Most Sensitive/Earliest Marker:** Anti-Müllerian Hormone (**AMH**). Unlike FSH, AMH is cycle-independent (can be tested any day). * **Best Ultrasound Marker:** Antral Follicle Count (**AFC**), measured via TVS. * **Day 3 FSH >20 mIU/mL:** Usually indicates poor response to stimulation and very low pregnancy potential. * **Inhibin B:** Produced by granulosa cells; its decline is one of the earliest biochemical changes in reproductive aging.

Question 1

Moebius syndrome in a fetus occurs due to maternal intake of which of the following teratogens?

Accepted Answer

Misoprostol

Answer

Mifepristone

Answer

Diethylstilbestrol (DES)

Answer

Methotrexate

Question 2

A woman treated for infertility presents with 6 weeks of amenorrhea and urinary retention. What is the most likely etiology?

Accepted Answer

Impacted cervical fibroid

Answer

Retroverted uterus

Answer

Pelvic hematocele

Answer

Carcinoma cervix

Question 3

A female patient presents with secondary amenorrhea and a serum prolactin level of 75 ng/ml. What is the most appropriate treatment?

Accepted Answer

Cabergoline

Answer

Ganirelix

Answer

Clomiphene

Answer

Estradiol

Question 4

Mifepristone is used in the management of which of the following conditions?

Accepted Answer

Ectopic pregnancy

Answer

Threatened abortion

Answer

Fibroid

Answer

Molar pregnancy

Question 5

A 20-year-old young girl presents with a history of rapidly developing hirsutism and amenorrhea with a change in voice. Which of the following blood tests would you perform to establish a diagnosis?

Accepted Answer

Testosterone

Answer

17-OH progesterone

Answer

DHEA

Answer

LH + FSH estimation

Question 6

The phase of the ovarian cycle can be correlated with all of the following EXCEPT:

Accepted Answer

Estrous cycle

Answer

Endometrial sampling

Answer

Vaginal cytology

Answer

Blood hormonal levels

Question 7

Which of the following statements regarding prolactin levels is TRUE?

Accepted Answer

Highest during pregnancy and fall during lactation

Answer

Lowest in pregnancy and increases after delivery

Answer

Unaffected by pregnancy and lactation

Answer

Variable in every pregnancy

Question 8

What is a primary medical application of Gonadotropin-releasing hormone (GnRH) analogues?

Accepted Answer

All of the above

Answer

Ovulation induction

Answer

Endometriosis management

Answer

Uterine fibroid treatment

Question 9

Which hormone level is most commonly assessed to evaluate ovarian reserve?

Accepted Answer

Follicle-Stimulating Hormone (FSH)

Answer

Luteinizing Hormone (LH)

Answer

LH/FSH ratio

Answer

Estradiol

Question 10

Which of the following hormones is known to play a role in the development of ovarian hyperstimulation syndrome?

Accepted Answer

HCG

Answer

Luteinizing hormone

Answer

FSH

Answer

Progesterone

Reproductive Endocrinology — MCQs

Reproductive Endocrinology — MCQs

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