Reproductive Endocrinology Practice Questions

Q: Menarche usually occurs how much time after thelarche?

2 years. **Explanation:** The sequence of female pubertal development follows a predictable chronological order, typically initiated by the activation of the HPO (Hypothalamic-Pituitary-Ovarian) axis. **1. Why Option B is Correct:** Thelarche (breast bud development) is usually the first clinical sign of puberty, occurring under the influence of rising estrogen levels (typically around age 10). **Menarche** (the onset of menstruation) is a late event in the pubertal sequence. On average, menarche occurs **2 to 2.5 years after thelarche**. By this time, the estrogen levels have sufficiently stimulated the endometrial lining to undergo shedding. **2. Why Other Options are Incorrect:** * **Option A (1 year):** This is too early. While the interval can vary, the physiological maturation required for the first menses generally takes longer than 12 months. * **Option C (6 months):** This is incorrect as the peak height velocity (PHV) usually occurs between thelarche and menarche, requiring more time for the hormonal milieu to stabilize. * **Option D (4 years):** If menarche has not occurred within 3 years of thelarche (or by age 15), it is clinically defined as primary amenorrhea and warrants investigation. **3. NEET-PG High-Yield Pearls:** * **Sequence of Puberty (Mnemonic: T-P-A-M):** 1. **T**helarche (Breast development - earliest sign) 2. **P**ubarche (Pubic hair development) 3. **A**daxarche/Growth Spurt (Peak Height Velocity) 4. **M**enarche (Last major event) * **Precocious Puberty:** Development of secondary sexual characteristics before age 8. * **Delayed Puberty:** No thelarche by age 13 or no menarche by age 15. * **Growth Spurt:** In girls, the peak height velocity occurs *before* menarche (Tanner Stage 2-3). Once menarche occurs, only about 2.5–5 cm of additional height is gained.

Q: Which of the following is true of testicular feminization syndrome?

Uterus is present. **Explanation:** **Testicular Feminization Syndrome**, now more commonly known as **Complete Androgen Insensitivity Syndrome (CAIS)**, is a condition where a genetic male (46, XY) has a total resistance to androgen action due to a mutation in the androgen receptor gene. **Why the "Correct" Answer is actually the "Incorrect" statement (Understanding the Question Logic):** In NEET-PG and similar exams, questions often ask for the "True" statement, but based on the options provided, this specific question is likely asking which of the following is **NOT** true (a common source of confusion in older question banks). * **The Fact:** In CAIS, the **uterus is absent**. * **The Mechanism:** The testes are present (intra-abdominal or inguinal) and secrete **Anti-Müllerian Hormone (AMH)**. AMH causes the regression of Müllerian structures (uterus, fallopian tubes, and upper 1/3rd of the vagina). Therefore, a patient with CAIS will have a blind-ending vaginal pouch and no uterus. **Analysis of Other Options:** * **A. Testes are present:** True. Testes develop because the SRY gene on the Y chromosome is functional. * **B. Female habitus:** True. Due to androgen resistance, the body follows the default female pathway. Peripheral conversion of testosterone to estrogen leads to breast development (often excellent) and female body contours. * **C. XY genotype:** True. These individuals are genetically male (46, XY). **High-Yield Clinical Pearls for NEET-PG:** 1. **Presentation:** Primary amenorrhea in a girl with well-developed breasts but **absent/scanty axillary and pubic hair** (due to androgen insensitivity). 2. **Karyotype:** 46, XY. 3. **Gonads:** Risk of malignancy (Gonadoblastoma/Dysgerminoma) is 2-5%; gonadectomy is recommended **after puberty** to allow for natural breast development. 4. **Differential Diagnosis:** In **Müllerian Agenesis (MRKH Syndrome)**, the karyotype is 46, XX, and pubic/axillary hair is normal.

Q: A woman with secondary amenorrhea has a negative progesterone challenge test but a positive combined estrogen and progesterone challenge test. What is the probable cause?

Ovarian failure. This question tests the systematic approach to secondary amenorrhea using hormonal challenge tests. ### **Mechanism & Interpretation** 1. **Negative Progesterone Challenge Test:** This indicates that the withdrawal of progesterone did not result in bleeding. This happens because either the **endometrium was not primed with estrogen** (low estrogen states) or there is an **outflow tract obstruction**. 2. **Positive Combined Estrogen-Progesterone Test:** The administration of exogenous estrogen followed by progesterone resulted in withdrawal bleeding. This confirms that the **outflow tract (uterus and cervix) is patent** and the endometrium is functional. **Conclusion:** Since the uterus is functional but didn't bleed with progesterone alone, the patient lacks endogenous estrogen. In the context of the options provided, **Ovarian Failure** (Premature Ovarian Insufficiency) is the cause of this hypoestrogenic state. ### **Why Other Options are Incorrect** * **Polycystic Ovarian Disease (PCOS):** Characterized by "unopposed estrogen." These patients have a **positive** progesterone challenge test because their endometrium is already primed. * **Asherman Syndrome:** This involves intrauterine adhesions. Patients will have a **negative** combined estrogen-progesterone test because the outflow tract is obstructed or the endometrium is destroyed. * **Pregnancy:** The most common cause of secondary amenorrhea, but it would result in a negative result for both tests (no bleeding). ### **NEET-PG High-Yield Pearls** * **Next Step:** After a positive combined test confirms a functional uterus, the next step is to check **Serum FSH levels** to differentiate between Hypogonadotropic Hypogonadism (Low FSH) and Ovarian Failure (High FSH). * **Step-1 (Progesterone Test):** Uses Medroxyprogesterone acetate (10mg for 5–10 days). * **Step-2 (Combined Test):** Uses Conjugated Estrogen (1.25mg for 21 days) + Progesterone (last 10 days).

Q: What is true about Swyer syndrome?

Mullerian ducts develop normally. **Explanation:** **Swyer Syndrome (Pure Gonadal Dysgenesis)** is a condition characterized by a **46,XY karyotype** in a phenotypic female. It occurs due to a mutation in the **SRY gene** or other genes involved in testis determination (like SOX9). 1. **Why Option B is correct:** In a normal male fetus, the testes produce **Anti-Müllerian Hormone (AMH)**, which causes the regression of Müllerian structures. In Swyer syndrome, the gonads fail to develop into testes and remain as non-functional **"streak gonads."** Because no testes are formed, no AMH is produced. In the absence of AMH, the Müllerian ducts (uterus, fallopian tubes, and upper vagina) develop normally. 2. **Why other options are incorrect:** * **Option A:** The gonads are not ovaries; they are fibrous **streak gonads** that lack germ cells. * **Option C:** Since there are no functioning testes, there is no testosterone or Dihydrotestosterone (DHT). Without androgens, the default pathway is female; thus, external genitalia appear **completely female**. * **Option D:** There is a **deficiency of testosterone**, not an excess, leading to a lack of secondary sexual characteristics (delayed puberty). **High-Yield Clinical Pearls for NEET-PG:** * **Presentation:** Primary amenorrhea with tall stature (due to delayed epiphyseal closure) and normal female internal/external genitalia. * **Malignancy Risk:** There is a high risk (approx. 30%) of developing **Gonadoblastoma** in the streak gonads. * **Management:** Immediate **prophylactic bilateral gonadectomy** upon diagnosis, followed by Hormone Replacement Therapy (HRT) for secondary sexual characteristics and bone health. * **Fertility:** Patients can achieve pregnancy through **oocyte donation** because they have a functional uterus.

Q: Which of the following is true about Polycystic Ovary Syndrome (PCOS)?

Hirsutism. **Explanation:** Polycystic Ovary Syndrome (PCOS) is a complex endocrine disorder characterized by hyperandrogenism, ovulatory dysfunction, and polycystic ovarian morphology (Rotterdam Criteria). **Why Hirsutism is Correct:** Hirsutism (excessive terminal hair growth in a male-pattern distribution) is the most common clinical manifestation of **hyperandrogenism** in PCOS. It occurs due to increased production of ovarian androgens (primarily testosterone) and increased 5α-reductase activity in hair follicles, which converts testosterone to the more potent dihydrotestosterone (DHT). **Analysis of Incorrect Options:** * **A. High FSH/LH ratio:** In PCOS, there is a **reversed ratio**. There is a characteristic **increase in LH** and low/normal FSH, leading to an **LH:FSH ratio > 2:1 or 3:1**. High LH stimulates theca cells to produce androgens. * **B. Unilateral large ovarian cyst:** PCOS typically presents with **bilateral** enlargement of ovaries containing multiple small follicles (usually 2–9 mm in diameter), often described as a "string of pearls" appearance. It is not characterized by a single large cyst. * **D. High SHBG:** PCOS is associated with **low Sex Hormone Binding Globulin (SHBG)** levels. Hyperinsulinemia (insulin resistance) suppresses hepatic SHBG production, which increases the fraction of **Free Testosterone**, worsening hirsutism and acne. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Criteria:** Rotterdam Criteria (requires 2 out of 3: Clinical/biochemical hyperandrogenism, Oligo/anovulation, and Polycystic ovaries on USG). * **Metabolic Link:** Strong association with **Insulin Resistance** and Acanthosis Nigricans. * **First-line Treatment:** Weight loss and lifestyle modification. For hirsutism, Combined Oral Contraceptive Pills (COCPs) are the first-line medical therapy. * **Drug of Choice for Infertility:** Letrozole (Aromatase inhibitor) is now preferred over Clomiphene Citrate.

Question 1

Menarche usually occurs how much time after thelarche?

Accepted Answer

2 years

Answer

1 year

Answer

6 months

Answer

4 years

Question 2

Which of the following is true of testicular feminization syndrome?

Accepted Answer

Uterus is present

Answer

Testes are present

Answer

Female habitus

Answer

XY genotype

Question 3

Which of the following conditions is associated with polycystic ovaries?

Accepted Answer

Adrenal hyperplasia

Answer

Pheochromocytoma

Answer

Pancreatic overactivity

Answer

Thyroid hypofunction

Question 4

A woman with secondary amenorrhea has a negative progesterone challenge test but a positive combined estrogen and progesterone challenge test. What is the probable cause?

Accepted Answer

Ovarian failure

Answer

Polycystic ovarian disease

Answer

Asherman syndrome

Answer

Pregnancy

Question 5

A 35-year-old mother of two children is suffering from amenorrhea for the last 12 months. She has a history of failure of lactation following her second delivery but remained asymptomatic thereafter. Skull X-ray shows an empty sella. What is the diagnosis?

Accepted Answer

Sheehan's syndrome

Answer

Menopause

Answer

Pituitary tumor

Answer

Intraductal papilloma of the breast

Question 6

What is true about Swyer syndrome?

Accepted Answer

Mullerian ducts develop normally

Answer

Gonads are ovaries

Answer

External genitalia appear male

Answer

Excess testosterone

Question 7

Which of the following biochemical changes is NOT seen in established cases of Stein-Leventhal syndrome?

Accepted Answer

Elevation in the level of sex hormone binding globulin (SHBG)

Answer

Marked elevation of LH in contrast to FSH

Answer

Insulin resistance

Answer

Elevation of plasma testosterone

Question 8

You are treating a 27-year-old infertile patient with bromocriptine. What is the likely underlying diagnosis?

Accepted Answer

Hyperprolactinemia

Answer

Hyperpituitarism

Answer

Hypopituitarism

Answer

Polycystic ovarian disease (PCOD)

Question 9

Which of the following is true about Polycystic Ovary Syndrome (PCOS)?

Accepted Answer

Hirsutism

Answer

High FSH/LH ratio

Answer

Unilateral large ovarian cyst

Answer

High SHBG

Question 10

A 32-year-old obese woman is diagnosed with polycystic ovarian disease and has irregular menstrual cycles (8-10 menses per year). Which of the following is NOT an appropriate management step?

Accepted Answer

Administer combined oral contraceptive pills to prevent endometrial hyperplasia.

Answer

Screen for dyslipidemia, diabetes mellitus, and metabolic syndrome.

Answer

Implement lifestyle changes focusing on diet and exercise.

Answer

Promote weight loss to restore normal ovulatory cycles.

Reproductive Endocrinology — MCQs

Reproductive Endocrinology — MCQs

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