Reproductive Endocrinology — MCQs

A 17-year-old patient presents with primary amenorrhea. On physical examination, she is 5'8" tall, has no breast development, and no axillary or pubic hair. Pelvic examination reveals a normally developed vagina, a visible cervix, a palpable uterus, and normal ovaries. The physician decides to test her sense of smell. What is the physician suspecting?

Q218Medium

A newborn infant with ambiguous genitalia is found to have a 46, XX karyotype. All of the following are diagnostic possibilities EXCEPT?

Q219Easy

Which hormone is responsible for the ferning pattern of cervical mucus?

Q220Easy

Which of the following is true about obstructive azoospermia?

Reproductive Endocrinology Indian Medical PG Practice Questions and MCQs

Question 211: Which of the following is NOT seen in testicular feminization syndrome?

A. 46,XY karyotype
B. Primary amenorrhea
C. Short stature (Correct Answer)
D. Presence of a vagina

Explanation: **Explanation:** **Testicular Feminization Syndrome (now known as Complete Androgen Insensitivity Syndrome - CAIS)** is an X-linked recessive condition where a genetic male (46,XY) has a total resistance to androgens. **Why "Short Stature" is the correct answer:** In CAIS, patients typically have **normal or tall stature**. This is because the Y chromosome contains growth-promoting genes, and the conversion of testosterone to estrogen (via aromatization) is sufficient to trigger the pubertal growth spurt but occurs later than in XX females, allowing for more pre-pubertal bone growth. **Analysis of incorrect options:** * **46,XY karyotype:** This is the hallmark of the condition. Despite the female phenotype, the genetic makeup is male. * **Primary amenorrhea:** Since there is no uterus (due to Anti-Müllerian Hormone production by the testes), these patients present with primary amenorrhea. They have a "blind-ending" vaginal pouch. * **Presence of a vagina:** A short, blind-ending vagina is present. It develops from the urogenital sinus (which does not require androgens), but the upper 1/3rd (Müllerian part) is absent. **High-Yield Clinical Pearls for NEET-PG:** * **Phenotype:** Feminine build, well-developed breasts (due to peripheral aromatization of testosterone to estrogen), but **absent or scanty axillary and pubic hair** (the "hairless woman"). * **Gonads:** Undescended testes are present (abdominal, inguinal, or labial). These must be removed after puberty to prevent **gonadoblastoma/dysgerminoma**, though the risk is low before age 20. * **Hormonal Profile:** High LH, normal to high Testosterone (but ineffective), and high Estrogen (relative to normal males). * **Differential Diagnosis:** In **Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome**, the karyotype is 46,XX, and axillary/pubic hair is normal.

Question 212: A girl is said to have primary amenorrhea in the absence of secondary sexual characters by what age?

A. 13 years (Correct Answer)
B. 16 years
C. 14 years
D. 15 years

Explanation: ### Explanation Primary amenorrhea is defined based on the chronological age of the patient in relation to the development of secondary sexual characteristics (specifically breast development or thelarche). **1. Why 13 years is correct:** According to the American College of Obstetricians and Gynecologists (ACOG), primary amenorrhea is diagnosed if there is a **failure of menarche by age 13 in the absence of secondary sexual characteristics**. This reflects a delay in the entire pubertal process. Since thelarche typically precedes menarche by about 2–3 years, a girl who has not started breast development by 13 is unlikely to menstruate soon and requires evaluation for conditions like hypogonadotropic hypogonadism or gonadal dysgenesis (e.g., Turner Syndrome). **2. Analysis of Incorrect Options:** * **15 years (Option D):** This is the age threshold for primary amenorrhea **if secondary sexual characteristics are present**. If a girl has normal breast development but hasn't menstruated by 15, it often suggests an outflow tract obstruction (e.g., Mullerian agenesis or imperforate hymen). * **14 years (Option C):** While older textbooks used 14 years as a cutoff, current international guidelines have lowered this to 13 to ensure earlier intervention for pubertal delay. * **16 years (Option B):** This was the traditional definition used in the past. However, modern standards consider 16 years too late for an initial evaluation, as 95% of girls reach menarche by age 15. **3. Clinical Pearls for NEET-PG:** * **The "2-Year Rule":** Menarche usually occurs 2–2.5 years after thelarche (Tanner Stage 2). * **Order of Puberty (Mnemonic: BAPM):** **B**reast bud (Thelarche) → **A**drenarche/Pubarche (Axillary/Pubic hair) → **P**eak height velocity → **M**enarche. * **Most Common Cause:** The most common cause of primary amenorrhea with absent secondary sexual characters is **Turner Syndrome (45, XO)**. * **Initial Investigation:** The first step in evaluating primary amenorrhea is a physical exam and **Ultrasound (USG)** to confirm the presence or absence of the uterus.

Question 213: Which of the following is an indication for using endogenous progesterone?

A. Contraception
B. Diagnostic of secondary amenorrhea
C. Endometrial hyperplasia
D. All of the above (Correct Answer)

Explanation: **Explanation:** Progesterone is a vital steroid hormone in reproductive endocrinology, used both diagnostically and therapeutically. The correct answer is **All of the above** because endogenous (natural) or bioidentical progesterone serves multiple clinical functions: 1. **Contraception:** Progesterone acts as a contraceptive by suppressing the LH surge (preventing ovulation), thickening cervical mucus (impeding sperm penetration), and altering the endometrium to prevent implantation. It is used in Progesterone-Only Pills (POPs) and injectable forms. 2. **Diagnostic of Secondary Amenorrhea:** The **Progesterone Challenge Test (PCT)** is a classic diagnostic tool. Administering progesterone for 5–10 days followed by withdrawal simulates the natural luteal phase. If "withdrawal bleeding" occurs, it confirms that the patient has adequate endogenous estrogen (primed endometrium) and a patent outflow tract, narrowing the diagnosis to chronic anovulation (e.g., PCOS). 3. **Endometrial Hyperplasia:** Progesterone opposes the proliferative effects of estrogen on the endometrium. In cases of hyperplasia without atypia, it induces secretory changes and eventual shedding, preventing progression to endometrial carcinoma. **High-Yield NEET-PG Pearls:** * **Progesterone Challenge Test:** Bleeding within 2–7 days of stopping progesterone is a "positive" test. If no bleeding occurs, the next step is an Estrogen + Progesterone challenge. * **Drug of Choice:** Micronized progesterone is preferred for hormone replacement therapy (HRT) due to its better safety profile compared to synthetic progestins. * **Luteal Phase Support:** Progesterone is the mainstay of treatment for recurrent pregnancy loss due to Luteal Phase Deficiency and is routinely used in IVF cycles.

Question 214: The eosinophilic index of the lateral vaginal wall cells indicates what?

A. Effect of luteinizing hormone
B. Estrogenic effect (Correct Answer)
C. Progesterone effect
D. Prolactin effect

Explanation: The **Eosinophilic Index (EI)** is a component of cytohormonal evaluation used to assess the hormonal status of the vaginal epithelium. ### Why "Estrogenic effect" is correct: The vaginal epithelium is highly sensitive to steroid hormones. **Estrogen** promotes the proliferation and maturation of vaginal squamous cells. Under the influence of estrogen, the epithelium matures into **superficial cells**, which are characterized by pyknotic nuclei and acidophilic (eosinophilic) cytoplasm. The Eosinophilic Index specifically measures the percentage of these mature, pink-staining superficial cells out of the total cell count. A high EI indicates high estrogenic activity. ### Why the other options are incorrect: * **Progesterone effect:** Progesterone inhibits full maturation. It causes cells to stop at the **intermediate stage**, leading to "clumping" or "folding" of cells (Navicular cells). This is measured by the *Progesterone Index* or *Crowding Index*, not the Eosinophilic Index. * **Luteinizing hormone (LH) & Prolactin:** These hormones do not have a direct, measurable effect on the maturation or staining characteristics of the vaginal squamous epithelium. Their effects on the reproductive system are mediated through the ovaries. ### High-Yield Clinical Pearls for NEET-PG: * **Karyopyknotic Index (KI):** Percentage of cells with pyknotic (shrunken/dense) nuclei. Like the EI, a high KI indicates high **Estrogen**. * **Maturation Index (MI):** Reported as a ratio of Parabasal : Intermediate : Superficial cells. * *Shift to the right:* High Estrogen (more superficial cells). * *Shift to the left:* Estrogen deficiency/Atrophy (more parabasal cells). * *Mid-shift:* Progesterone effect or pregnancy (more intermediate cells). * **Sample Site:** For hormonal evaluation, the sample must be taken from the **upper third of the lateral vaginal wall**, as this area is most sensitive to hormonal changes and least affected by local inflammation.

Question 215: What is the commonest cause of first-trimester abortion?

A. Monosomy
B. Trisomy (Correct Answer)
C. Triploidy
D. Aneuploidy

Explanation: **Explanation:** Spontaneous abortion in the first trimester is most frequently attributed to genetic abnormalities, which account for approximately 50-60% of early pregnancy losses. **1. Why Trisomy is the Correct Answer:** Among all chromosomal abnormalities leading to first-trimester miscarriage, **Autosomal Trisomy** is the single most common category, representing about 50% of all karyotypically abnormal abortuses. Specifically, **Trisomy 16** is the most frequent individual trisomy observed, though it is never seen in live births. **2. Analysis of Incorrect Options:** * **Aneuploidy (Option D):** While aneuploidy (an abnormal number of chromosomes) is the broad category that includes trisomies and monosomies, in the context of NEET-PG questions, examiners look for the most specific "commonest" subtype. Since trisomies form the largest bulk of aneuploidies, **Trisomy** is the preferred specific answer. * **Monosomy (Option A):** **Monosomy X (45,X or Turner Syndrome)** is the most common *single* specific chromosomal abnormality found in spontaneous abortions (approx. 20%). However, as a group, trisomies are more frequent than monosomies. * **Triploidy (Option C):** This is a form of polyploidy (69 chromosomes) often associated with hydatidiform moles. While significant, it is less common than autosomal trisomies. **High-Yield Clinical Pearls for NEET-PG:** * **Most common overall cause of 1st-trimester abortion:** Genetic factors (Chromosomal anomalies). * **Most common chromosomal anomaly:** Autosomal Trisomy. * **Most common specific Trisomy:** Trisomy 16. * **Most common specific karyotype abnormality:** 45,X (Monosomy X). * **Most common cause of 2nd-trimester abortion:** Maternal factors (e.g., Cervical incompetence, uterine anomalies).

Question 216: Pure gonadal dysgenesis is diagnosed in the presence of which of the following findings?

A. Bilateral streak gonads (Correct Answer)
B. Bilateral dysgenetic gonads
C. One streak gonad and one dysgenetic gonad
D. One streak gonad and one normal-appearing gonad

Explanation: **Explanation:** **Pure Gonadal Dysgenesis (PGD)** is a clinical condition characterized by the failure of primordial germ cells to populate the genital ridges, resulting in the development of **bilateral streak gonads**. Unlike Turner syndrome (45,X), patients with PGD have a normal karyotype—either **46,XX** (Perrault Syndrome if associated with deafness) or **46,XY** (Swyer Syndrome). 1. **Why Option A is correct:** In PGD, there is a complete failure of gonadal development. The gonads are replaced by fibrous tissue (streaks) that contain no germ cells. Because the gonads are non-functional, there is no production of sex steroids or Anti-Müllerian Hormone (AMH). This leads to a phenotypic female with primary amenorrhea, infantile secondary sexual characteristics, and a persistent Müllerian system (uterus and tubes present). 2. **Why Options B, C, and D are incorrect:** * **Bilateral dysgenetic gonads (Option B):** This term is non-specific. While streak gonads are a form of dysgenesis, "dysgenetic gonads" often implies some disorganized gonadal tissue is present, which is not the case in "Pure" dysgenesis. * **Mixed Gonadal Dysgenesis (Options C & D):** These findings are characteristic of **Mixed Gonadal Dysgenesis (MGD)**, typically associated with a **45,X/46,XY** mosaicism. MGD is defined by a streak gonad on one side and a dysgenetic testis or a normal-appearing gonad on the other, often leading to ambiguous genitalia. **High-Yield Clinical Pearls for NEET-PG:** * **Swyer Syndrome (46,XY):** These patients have a high risk (approx. 25-30%) of developing germ cell tumors (e.g., **Gonadoblastoma**, Dysgerminoma). Prophylactic gonadectomy is indicated as soon as the diagnosis is made. * **Hormonal Profile:** Characterized by **Hypergonadotropic Hypogonadism** (High FSH/LH, Low Estrogen). * **Stature:** Unlike Turner syndrome, patients with Pure Gonadal Dysgenesis are usually of **normal or tall stature** because they lack the SHOX gene deletion.

Question 217: A 17-year-old patient presents with primary amenorrhea. On physical examination, she is 5'8" tall, has no breast development, and no axillary or pubic hair. Pelvic examination reveals a normally developed vagina, a visible cervix, a palpable uterus, and normal ovaries. The physician decides to test her sense of smell. What is the physician suspecting?

A. Asherman's syndrome
B. Kallman's syndrome (Correct Answer)
C. Stein-Leventhal syndrome
D. Sheehan's syndrome

Explanation: ### Explanation **Correct Option: B. Kallmann Syndrome** The clinical presentation of **primary amenorrhea** combined with a **lack of secondary sexual characteristics** (no breast development, no axillary/pubic hair) indicates a failure of the Hypothalamic-Pituitary-Ovarian (HPO) axis. Kallmann Syndrome is a form of **hypogonadotropic hypogonadism** caused by the failure of GnRH-secreting neurons to migrate from the olfactory placode to the hypothalamus. This migration defect is often associated with the hypoplasia or aplasia of the olfactory bulbs, leading to **anosmia** (loss of smell) or hyposmia. Testing the sense of smell is the classic clinical bedside maneuver to differentiate Kallmann syndrome from other forms of hypogonadotropic hypogonadism. **Why other options are incorrect:** * **Asherman’s Syndrome:** This involves intrauterine adhesions (usually post-curettage). Patients have normal secondary sexual characteristics and ovaries; the defect is in the end-organ (uterus). * **Stein-Leventhal Syndrome (PCOS):** Typically presents with secondary amenorrhea, hirsutism, and obesity. Patients have normal breast development and pubic hair. * **Sheehan’s Syndrome:** This is postpartum pituitary necrosis following severe obstetric hemorrhage. It presents as secondary amenorrhea and failure of lactation in women who have already achieved puberty. **NEET-PG High-Yield Pearls:** * **Genetics:** Most commonly X-linked recessive (KAL1 gene mutation). * **Clinical Triad:** Primary amenorrhea + Delayed puberty + Anosmia. * **Hormonal Profile:** Low GnRH → Low FSH/LH → Low Estrogen (Hypo-Hypo). * **Imaging:** MRI may show absent or hypoplastic olfactory bulbs. * **Note:** While the question mentions "normal ovaries" and "palpable uterus," these organs are anatomically present but remain prepubertal/infantile due to the lack of hormonal stimulation.

Question 218: A newborn infant with ambiguous genitalia is found to have a 46, XX karyotype. All of the following are diagnostic possibilities EXCEPT?

A. 21-hydroxylase deficiency
B. Partial androgen resistance syndrome (Correct Answer)
C. True hermaphroditism
D. Maternal virilizing tumor

Explanation: ### Explanation The core concept in this question is the distinction between **46,XX DSD** (Disorders of Sex Development) and **46,XY DSD**. **Why Option B is the Correct Answer:** **Partial Androgen Insensitivity Syndrome (PAIS)** is a condition where a **46,XY** individual has a partial inability to respond to androgens. Because the karyotype is 46,XY, these individuals have testes that produce testosterone and Anti-Müllerian Hormone (AMH). The clinical presentation is ambiguous genitalia in a genetic male. It **cannot** occur in a 46,XX individual because they lack a Y chromosome and SRY gene-driven testicular development. **Analysis of Incorrect Options:** * **A. 21-hydroxylase deficiency:** This is the most common cause of Congenital Adrenal Hyperplasia (CAH). In a 46,XX fetus, excess adrenal androgens cause virilization of external genitalia (clitoromegaly, labial fusion) while internal female organs remain intact. * **C. True Hermaphroditism (Ovotesticular DSD):** This condition is defined by the presence of both ovarian and testicular tissue in the same individual. The most common karyotype is **46,XX (approx. 60%)**, followed by mosaics. It frequently presents with ambiguous genitalia. * **D. Maternal virilizing tumor:** If a pregnant woman has an androgen-secreting tumor (e.g., Luteoma of pregnancy or Arrhenoblastoma), the excess androgens can cross the placenta and virilize a 46,XX fetus. ### NEET-PG High-Yield Pearls * **Most common cause of ambiguous genitalia in a newborn:** 21-hydroxylase deficiency (CAH). * **Internal Genitalia Rule:** In 46,XX DSD (like CAH), the uterus and tubes are **present** because there is no AMH. In 46,XY DSD (like PAIS), the uterus is **absent** because testes produce AMH. * **Prader Staging:** Used to describe the degree of virilization of external genitalia in females. * **Gold Standard for Diagnosis:** Karyotyping and biochemical profile (17-OH Progesterone levels for CAH).

Question 219: Which hormone is responsible for the ferning pattern of cervical mucus?

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

Explanation: **Explanation:** The **ferning pattern** (arborization) of cervical mucus is a classic physiological phenomenon driven by **Estrogen**. During the follicular phase of the menstrual cycle, rising estrogen levels cause the cervical mucus to become thin, watery, and alkaline. Most importantly, estrogen increases the concentration of **sodium chloride (NaCl)** within the mucus. When this mucus is spread on a glass slide and allowed to air-dry, the high salt content crystallizes, forming a microscopic pattern resembling fern leaves. This indicates a fertile period and the approach of ovulation. **Analysis of Options:** * **Progesterone (Incorrect):** Progesterone, dominant in the luteal phase, makes cervical mucus thick, cellular, and acidic. It inhibits ferning and instead produces a "beading" pattern. * **LH (Incorrect):** While the Luteinizing Hormone surge triggers ovulation, it does not directly modulate the biochemical properties of cervical mucus required for crystallization. * **Prolactin (Incorrect):** Prolactin is primarily involved in lactation and the inhibition of GnRH; it has no direct role in the ferning of cervical mucus. **Clinical Pearls for NEET-PG:** * **Spinnbarkeit Effect:** Also caused by Estrogen, this refers to the "stretchability" of cervical mucus (up to 10–12 cm) just before ovulation. * **Palm Leaf Pattern:** Another name for the ferning pattern. * **Progesterone Challenge:** If a patient is given progesterone and the ferning disappears, it confirms that the mucus was previously under the influence of estrogen. * **Infertility Workup:** The absence of ferning mid-cycle may suggest anovulation or estrogen deficiency.

Question 220: Which of the following is true about obstructive azoospermia?

A. FSH and LH increased
B. Normal FSH and normal LH (Correct Answer)
C. LH raised, normal FSH
D. FSH raised, normal LH

Explanation: In male infertility, the distinction between **obstructive azoospermia (OA)** and **non-obstructive azoospermia (NOA)** is a high-yield NEET-PG concept. ### **Explanation of the Correct Answer** In **Obstructive Azoospermia**, the hypothalamic-pituitary-gonadal (HPG) axis is entirely intact. The primary pathology is a physical blockage (e.g., post-vasectomy, congenital absence of vas deferens, or post-infectious scarring) that prevents sperm from entering the ejaculate. Because the testicular parenchyma and Sertoli cells are functioning normally, they continue to produce **Inhibin B**, which provides negative feedback to the pituitary. Consequently, **FSH and LH levels remain within the normal range**, and the testes are typically of normal size and consistency. ### **Analysis of Incorrect Options** * **Option A (FSH and LH increased):** This indicates **Hypergonadotropic Hypogonadism** (Primary Testicular Failure), seen in conditions like Klinefelter syndrome or bilateral orchitis. * **Option C & D (Isolated elevations):** Isolated FSH elevation (Option D) is a hallmark of **Sertoli cell dysfunction** or isolated germ cell failure (NOA), where the lack of Inhibin B leads to a rise in FSH while LH remains normal. ### **High-Yield Clinical Pearls for NEET-PG** * **Diagnostic Gold Standard:** A **testicular biopsy** showing normal spermatogenesis confirms OA when the ejaculate is azoospermic. * **Fructose Test:** If the vas deferens and seminal vesicles are absent (CBAVD), the semen analysis will show **low volume, acidic pH, and absent fructose**. * **Management:** Sperm can be retrieved directly from the epididymis (**MESA/PESA**) or testes (**TESA**) for use in **ICSI** (Intracytoplasmic Sperm Injection). * **Key Marker:** **Inhibin B** is the most sensitive marker for spermatogenesis; it is normal in OA but low in NOA.

Practice by Chapter

Hypothalamic-Pituitary-Ovarian Axis

Practice Questions

Disorders of Puberty

Practice Questions

Hirsutism and Virilization

Practice Questions

Primary Ovarian Insufficiency

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Hyperprolactinemia

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Hyperandrogenism

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Metabolic Dysfunction in PCOS

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Neuroendocrine Disorders and Reproduction

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Hormonal Evaluation and Testing

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Ovulation Induction

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