Reproductive Endocrinology Practice Questions

Q: All of the following assist in predicting ovulation except:

Serum progesterone in follicular phase. To predict or confirm ovulation, we look for physiological changes driven by the shift from estrogen dominance to progesterone dominance. **Explanation of the Correct Answer:** **Option C (Serum progesterone in follicular phase)** is the correct answer because progesterone levels are **low ( 3 ng/mL suggests ovulation has occurred. **Analysis of Other Options:** * **Basal Body Temperature (BBT):** Progesterone is thermogenic. A rise of 0.4°F to 1.0°F (biphasic pattern) occurs *after* ovulation. While it confirms ovulation retrospectively, monitoring the chart helps predict future cycles. * **Cervical Mucus:** Under estrogen influence (pre-ovulatory), mucus becomes thin, profuse, watery, and shows **spinnbarkeit** (stretchability) and **ferning**. These changes peak just before ovulation (the "peak mucus day"). * **Endometrial Biopsy:** Historically used to confirm ovulation by identifying a **secretory endometrium** (due to progesterone). If performed on Day 21-23, it confirms that ovulation has already taken place. **NEET-PG High-Yield Pearls:** * **Gold Standard for timing ovulation:** Serial Transvaginal Ultrasound (TVS) to monitor follicular size (disappearance of follicle/collapse). * **Best biochemical predictor:** Urinary LH surge (ovulation occurs 24–36 hours after the surge). * **Spinnbarkeit Effect:** Maximum stretchability (10–12 cm) occurs at ovulation. * **Mittelschmerz sign:** Pelvic pain experienced mid-cycle due to follicular rupture.

Q: In women with Polycystic Ovarian Disease (PCOD) and irregular menstrual cycles, what is the effect of combined oral contraceptive pills?

Increase sex hormone-binding globulin. **Explanation:** Combined Oral Contraceptive Pills (COCPs) are the first-line management for menstrual irregularities and hirsutism in PCOD. The primary mechanism involves the **estrogen component (Ethinyl Estradiol)**, which stimulates the liver to **increase the production of Sex Hormone-Binding Globulin (SHBG)**. Increased SHBG levels lead to a higher binding capacity for circulating androgens, thereby **decreasing the levels of Free Testosterone**. This reduction in free androgens is the key mechanism by which COCPs improve clinical symptoms like acne and hirsutism. **Analysis of Incorrect Options:** * **B. Cause endometrial hyperplasia:** COCPs actually **protect** against endometrial hyperplasia. In PCOD, "unopposed estrogen" causes the lining to thicken; the progestogen in COCPs antagonizes this effect, inducing regular withdrawal bleeds and reducing the risk of endometrial carcinoma. * **C. Increase luteinizing hormone:** COCPs exert negative feedback on the pituitary, **decreasing LH and FSH** secretion. This suppresses ovarian androgen production. * **D. Increase insulin:** COCPs do not increase insulin; in fact, some older formulations may slightly worsen insulin resistance, though low-dose pills are generally considered metabolic-neutral. **NEET-PG High-Yield Pearls:** * **DOC for Hirsutism in PCOD:** COCPs (specifically those containing anti-androgenic progestins like Cyproterone acetate or Drospirenone). * **Rotterdam Criteria:** Diagnosis requires 2 out of 3: Oligo/anovulation, Clinical/Biochemical hyperandrogenism, and Polycystic ovaries on USG. * **LH:FSH Ratio:** Classically >2:1 or 3:1 (though no longer a primary diagnostic criterion).

Q: Hirsutism is seen in all of the following conditions EXCEPT:

Testicular feminizing syndrome. **Explanation:** The core concept in this question is the requirement of **androgen receptors** for the manifestation of hirsutism. Hirsutism is defined as the presence of terminal hair in females in a male-pattern distribution, driven by excess androgens acting on sensitive hair follicles. **Why Option C is correct:** **Testicular Feminizing Syndrome (Complete Androgen Insensitivity Syndrome - CAIS)** is characterized by a 46,XY karyotype with a mutation in the androgen receptor gene. Although these individuals have high levels of circulating testosterone (produced by undescended testes), their end-organ receptors are completely non-functional. Without functioning receptors, androgens cannot stimulate hair follicles; consequently, these patients typically have **absent or scanty pubic and axillary hair** and no hirsutism. **Why the other options are incorrect:** * **A. Stein-Leventhal Syndrome (PCOS):** The most common cause of hirsutism. It involves hyperandrogenism due to increased LH stimulation of ovarian theca cells. * **B. Cushing Syndrome:** Excess ACTH or cortisol leads to increased production of adrenal androgens (like DHEAS), resulting in hirsutism. * **D. Congenital Adrenal Hyperplasia (CAH):** Specifically the 21-hydroxylase deficiency form, where a "shunting" of precursors occurs, leading to massive overproduction of adrenal androgens. **NEET-PG High-Yield Pearls:** * **Ferriman-Gallwey Score:** Used to quantify hirsutism (Score ≥8 is significant in Indians). * **CAIS Clinical Triad:** Primary amenorrhea, 46,XY karyotype, and a blind-ending vagina with absent uterus/ovaries. * **Drug-induced Hirsutism:** Phenytoin, Cyclosporine, and Minoxidil (though these often cause generalized hypertrichosis rather than patterned hirsutism). * **Rapid onset hirsutism** with virilization should always raise suspicion of an androgen-secreting tumor (Ovarian or Adrenal).

Q: A 15-year-old girl complains of failure to attain menarche. Her height is 4 feet. She has not yet developed secondary sexual characteristics. Ultrasound shows a uterus and vagina. FSH and LH levels are high. What is the best step in confirming the diagnosis?

Perform a Karyotype. ### Explanation This clinical scenario describes a case of **Primary Amenorrhea** with **Hypergonadotropic Hypogonadism** (High FSH/LH). **1. Why Karyotyping is the Correct Answer:** The patient presents with the classic triad of **Turner Syndrome (45,XO)**: * **Short Stature:** (Height 4 feet). * **Sexual Infantilism:** Failure of secondary sexual characteristics due to streak ovaries (gonadal dysgenesis). * **Hypergonadotropic Hypogonadism:** Low estrogen levels (due to ovarian failure) result in a lack of negative feedback, causing the pituitary to secrete high levels of FSH and LH. In any patient with primary amenorrhea, short stature, and high gonadotropins, **Karyotyping** is the gold standard and essential next step to confirm the chromosomal abnormality and rule out mosaics. **2. Why Other Options are Incorrect:** * **CT Scan:** Not indicated. While it could visualize pelvic structures, Ultrasound has already confirmed the presence of a uterus and vagina. It does not provide a genetic diagnosis. * **Buccal Smear:** This looks for Barr bodies. While it was used historically, it is unreliable for diagnosing Turner syndrome (especially mosaicism) and has been replaced by formal karyotyping. * **Progesterone Withdrawal Test:** This tests for endogenous estrogen and outflow tract patency. In this patient, estrogen is already known to be low (lack of secondary sexual characteristics), so the test would be negative and provide no new diagnostic information. ### Clinical Pearls for NEET-PG: * **Most common cause of Primary Amenorrhea:** Turner Syndrome (45,XO). * **Most common cause of Delayed Puberty with High FSH:** Turner Syndrome. * **Mullerian Structures:** In Turner Syndrome, the uterus and vagina are **present** because there is no Anti-Mullerian Hormone (AMH) produced (no testes). * **High-Yield Association:** Always screen Turner patients for **Coarctation of the Aorta** and **Bicuspid Aortic Valve**.

Q: Which of the following tests is NOT helpful in determining the occurrence of ovulation in a woman?

Estradiol levels. **Explanation:** The determination of ovulation relies on identifying physiological changes triggered by the **luteal phase** (post-ovulatory) or the physical disappearance of a follicle. **Why Estradiol (D) is the correct answer:** Estradiol levels peak *before* ovulation to trigger the LH surge and remain elevated during the luteal phase. However, a high estradiol level only indicates follicular maturity; it does not guarantee that the follicle has ruptured. Because estradiol fluctuates throughout the cycle and does not provide definitive proof of follicle release, it is not a reliable marker for confirming that ovulation has actually occurred. **Analysis of Incorrect Options:** * **Ultrasound (USG):** Serial transvaginal scans (Follicular monitoring) are the gold standard. Ovulation is confirmed by the sudden disappearance of a mature follicle, the appearance of internal echoes (corpus luteum formation), or free fluid in the Pouch of Douglas. * **Progesterone levels:** Progesterone is secreted by the corpus luteum *after* ovulation. A mid-luteal phase (Day 21) serum progesterone level **>3 ng/mL** is a reliable indicator that ovulation has taken place. * **Basal Body Temperature (BBT):** Progesterone has a thermogenic effect on the hypothalamus. A rise in BBT by 0.4–1.0°F in the second half of the cycle (biphasic curve) indicates ovulation. **NEET-PG High-Yield Pearls:** * **Best time for Progesterone test:** Day 21 of a 28-day cycle (Mid-luteal phase). * **Best indicator of "Imminent" Ovulation:** LH Surge (detected in urine or blood). * **Gold Standard for Ovulation:** Ultrasound or Pregnancy. * **Endometrial Biopsy:** If performed, a "secretory endometrium" confirms ovulation (historically important, now rarely used for this purpose).

Q: A 19-year-old patient presents with primary amenorrhea. She has well-developed breasts and axillary and pubic hair. The uterus and vagina are absent. What is the most likely diagnosis?

Mullerian agenesis. **Explanation:** The clinical presentation of **primary amenorrhea** in a patient with **well-developed secondary sexual characteristics** (breasts and pubic hair) but an **absent uterus and vagina** is the classic hallmark of **Mullerian Agenesis** (Mayer-Rokitansky-Küster-Hauser or MRKH syndrome). **1. Why Mullerian Agenesis is Correct:** * **Breast Development:** Indicates a functional Hypothalamic-Pituitary-Ovarian (HPO) axis. The ovaries are derived from the genital ridge (not the Mullerian ducts), so they function normally, producing estrogen for breast development. * **Pubic/Axillary Hair:** Indicates normal adrenal/ovarian androgen production and functional androgen receptors. * **Absent Uterus/Vagina:** The Mullerian ducts fail to develop, leading to the absence of the fallopian tubes, uterus, and upper 2/3rd of the vagina. * **Karyotype:** 46, XX. **2. Why Other Options are Incorrect:** * **XYY Syndrome:** These individuals are phenotypically male, usually tall, and do not present with primary amenorrhea. * **Gonadal Dysgenesis (e.g., Turner Syndrome):** Patients typically have "streak ovaries," leading to estrogen deficiency. This results in **absent breast development** and elevated gonadotropins (Hypergonadotropic hypogonadism). * **Klinefelter’s Syndrome (47, XXY):** These are phenotypic males with small testes, gynecomastia, and infertility; they do not present with a female phenotype or primary amenorrhea. **Clinical Pearls for NEET-PG:** * **Differential Diagnosis:** Always differentiate MRKH from **Androgen Insensitivity Syndrome (AIS)**. In AIS (46, XY), there is **absent/scanty** pubic and axillary hair due to androgen resistance. * **Associated Anomalies:** 30-40% of MRKH patients have **renal anomalies** (e.g., renal agenesis, ectopic kidney). Always order a Renal Ultrasound. * **Ovaries:** In MRKH, ovaries are normal and located intra-abdominally; ovulation occurs normally.

Q: A patient presents with a 46, XY chromosomal pattern, presence of a uterus and cervix, but poorly developed breasts. What is the most likely diagnosis?

Swyer syndrome. **Explanation:** The key to solving this question lies in the discordance between the genotype (**46, XY**) and the internal anatomy (**presence of uterus/cervix**). **1. Why Swyer Syndrome is Correct:** Swyer syndrome (Pure Gonadal Dysgenesis) is caused by a mutation in the **SRY gene** or other genes involved in testis determination. Because the testes fail to develop (forming "streak gonads"), there is **no production of Anti-Müllerian Hormone (AMH)** or testosterone. In the absence of AMH, the Müllerian ducts do not regress, leading to the development of a **uterus, cervix, and fallopian tubes**. Since there is no estrogen production from the streak gonads, the patient presents with primary amenorrhea and **poorly developed breasts** (delayed puberty). **2. Why the other options are incorrect:** * **Turner Syndrome (45, XO):** While these patients have streak gonads and a uterus, their genotype is 45, XO, not 46, XY. * **Androgen Insensitivity Syndrome (AIS):** These patients are 46, XY, but they have functioning testes that produce AMH. Therefore, the **uterus and cervix are absent**. They typically have well-developed breasts due to the peripheral conversion of testosterone to estrogen. * **Klinefelter Syndrome (47, XXY):** These patients have a male phenotype with small testes and gynecomastia, not a female phenotype with a uterus. **High-Yield Clinical Pearls for NEET-PG:** * **Müllerian Structures:** Present in Swyer and Turner; Absent in AIS and MRKH syndrome. * **Gonadectomy:** In Swyer syndrome, there is a high risk (approx. 25-30%) of developing **Gonadoblastoma**; therefore, prophylactic gonadectomy is indicated as soon as the diagnosis is made. * **Height:** Patients with Swyer syndrome are typically of normal or tall stature (unlike the short stature in Turner syndrome).

Q: Which of the following is NOT a feature of polycystic ovarian disease?

Polymenorrhea. **Explanation:** Polycystic Ovarian Syndrome (PCOS) is a complex endocrine disorder characterized by hyperandrogenism and ovulatory dysfunction. **Why Polymenorrhea is the correct answer:** In PCOS, the fundamental pathology is **chronic anovulation**. Due to the lack of regular ovulation, there is no progesterone production to stabilize the endometrium. This leads to **Oligomenorrhea** (infrequent periods, >35 days apart) or **Amenorrhea** (absence of periods). **Polymenorrhea** (frequent cycles <21 days) is not a feature of PCOS; it is more commonly associated with endometriosis, PID, or perimenopause. **Analysis of Incorrect Options:** * **Hirsutism (A):** This is a hallmark feature caused by **hyperandrogenism**. Excess LH stimulates the ovarian theca cells to produce androgens, leading to male-pattern hair growth. * **Obesity (C):** Approximately 50-60% of PCOS patients are obese. Obesity exacerbates **insulin resistance**, which further stimulates androgen production and suppresses SHBG (Sex Hormone Binding Globulin). * **Infertility (D):** PCOS is the most common cause of **anovulatory infertility**. The lack of a dominant follicle prevents regular egg release. **High-Yield Clinical Pearls for NEET-PG:** * **Rotterdam Criteria (2 of 3):** 1. Clinical/biochemical hyperandrogenism, 2. Oligo/anovulation, 3. Polycystic ovaries on ultrasound ("String of pearls" appearance). * **LH:FSH Ratio:** Classically elevated to **3:1** (though no longer a diagnostic requirement). * **Metabolic Risks:** Increased risk of Type 2 Diabetes, Dyslipidemia, and **Endometrial Carcinoma** (due to unopposed estrogen). * **Drug of Choice:** **Clomiphene Citrate** (traditionally) or **Letrozole** (now preferred for ovulation induction).

Q: Which of the following best diagnoses the luteal phase?

Endometrial biopsy. The diagnosis of the luteal phase depends on identifying the physiological changes induced by progesterone following ovulation. **Why Endometrial Biopsy is the Correct Answer:** Endometrial biopsy is considered the **gold standard** for diagnosing the luteal phase and assessing its functional adequacy. Under the influence of progesterone, the endometrium undergoes specific, predictable histological changes (secretory transformation). By performing a biopsy (traditionally on day 21–23 of a 28-day cycle), a pathologist can "date" the endometrium using **Noyes’ criteria**. If the histological date lags behind the menstrual date by more than 2 days, it indicates Luteal Phase Deficiency (LPD). **Analysis of Incorrect Options:** * **Serum Progesterone:** While a level >3 ng/mL confirms ovulation, a single mid-luteal measurement (Day 21) is often unreliable because progesterone is secreted in pulses. It reflects the presence of a corpus luteum but does not confirm if the end-organ (endometrium) is responding appropriately. * **Basal Body Temperature (BBT):** A rise of 0.4–0.8°F indicates the thermogenic effect of progesterone. However, it is retrospective, prone to user error, and only confirms that ovulation occurred, not the quality of the luteal phase. * **Ultrasonography:** USG can visualize the corpus luteum or a collapsed follicle, but it cannot provide functional or histological confirmation of the luteal phase. **High-Yield Clinical Pearls for NEET-PG:** * **Best time for biopsy:** 2–3 days before the expected onset of menstruation (Day 26 of a 28-day cycle) provides the most accurate dating. * **Fern Test:** Disappearance of the "fern pattern" and appearance of "cellular/beaded pattern" in cervical mucus also indicates the luteal phase. * **Progesterone Peak:** Occurs 7–8 days after the LH surge.

Question 1

All of the following assist in predicting ovulation except:

Accepted Answer

Serum progesterone in follicular phase

Answer

Basal body temperature

Answer

Cervical mucus

Answer

Endometrial biopsy

Question 2

All of the following are true regarding folliculogenesis and ovulation EXCEPT?

Accepted Answer

Elevated and static levels of estradiol are essential for ovulation.

Answer

Follicular development and differentiation takes about 85 days.

Answer

AMH supports monofollicular development.

Answer

The first phase of follicular growth is gonadotropin insensitive.

Question 3

In women with Polycystic Ovarian Disease (PCOD) and irregular menstrual cycles, what is the effect of combined oral contraceptive pills?

Accepted Answer

Increase sex hormone-binding globulin

Answer

Cause endometrial hyperplasia

Answer

Increase luteinizing hormone

Answer

Increase insulin

Question 4

Hirsutism is seen in all of the following conditions EXCEPT:

Accepted Answer

Testicular feminizing syndrome

Answer

Stein leventhal syndrome

Answer

Cushing syndrome

Answer

Congenital adrenal hyperplasia

Question 5

A 15-year-old girl complains of failure to attain menarche. Her height is 4 feet. She has not yet developed secondary sexual characteristics. Ultrasound shows a uterus and vagina. FSH and LH levels are high. What is the best step in confirming the diagnosis?

Accepted Answer

Perform a Karyotype

Answer

Perform a CT scan

Answer

Perform a buccal smear

Answer

Perform a progesterone withdrawal test

Question 6

Which of the following tests is NOT helpful in determining the occurrence of ovulation in a woman?

Accepted Answer

Estradiol levels

Answer

Ultrasound (USG)

Answer

Progesterone levels

Answer

Basal body temperature changes

Question 7

A 19-year-old patient presents with primary amenorrhea. She has well-developed breasts and axillary and pubic hair. The uterus and vagina are absent. What is the most likely diagnosis?

Accepted Answer

Mullerian agenesis

Answer

XYY syndrome

Answer

Gonadal dysgenesis

Answer

Klinefelter's syndrome

Question 8

A patient presents with a 46, XY chromosomal pattern, presence of a uterus and cervix, but poorly developed breasts. What is the most likely diagnosis?

Accepted Answer

Swyer syndrome

Answer

Turner syndrome

Answer

Androgen insensitivity syndrome

Answer

Klinefelter syndrome

Question 9

Which of the following is NOT a feature of polycystic ovarian disease?

Accepted Answer

Polymenorrhea

Answer

Hirsutism

Answer

Obesity

Answer

Infertility

Question 10

Which of the following best diagnoses the luteal phase?

Accepted Answer

Endometrial biopsy

Answer

Serum progesterone levels

Answer

Basal body temperature

Answer

Ultrasonography

Reproductive Endocrinology — MCQs

Reproductive Endocrinology — MCQs

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