Reproductive · Female Infertility
The facts most likely to be tested
Infertility is defined as the failure to achieve a clinical pregnancy after 12 months of regular, unprotected intercourse in women under 35 years of age.
The initial evaluation for a woman over 35 years of age should begin after 6 months of unprotected intercourse due to the age-related decline in ovarian reserve.
Hysterosalpingography (HSG) is the gold standard diagnostic test to assess tubal patency and identify structural uterine abnormalities.
Day 3 serum follicle-stimulating hormone (FSH) and anti-Müllerian hormone (AMH) levels are the most reliable markers for assessing ovarian reserve.
Clomiphene citrate is the first-line pharmacologic agent used to induce ovulation in patients with polycystic ovary syndrome (PCOS).
Mid-luteal phase progesterone levels measured approximately one week before the expected menses confirm the occurrence of ovulation.
Semen analysis is a mandatory component of the initial infertility workup and must be performed early to rule out male factor infertility.
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A 32-year-old woman presents to the clinic with her husband, reporting an inability to conceive after 14 months of regular, unprotected intercourse. She has regular menses every 28 days and no significant past medical history. Her husband has two children from a previous marriage. Physical examination is unremarkable, and a pelvic ultrasound shows a normal uterus and bilateral ovaries. The patient's day 3 FSH level is elevated, and her AMH level is low.
What is the most likely underlying etiology of this patient's infertility?
Diminished ovarian reserve
The patient's clinical presentation of infertility combined with an elevated day 3 FSH and low AMH is diagnostic of diminished ovarian reserve, which is a common cause of female infertility.
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Etiology / Epidemiology
Defined as failure to conceive after 12 months of regular unprotected intercourse. Advanced maternal age (>35) is the most common risk factor.
Clinical Manifestations
Often asymptomatic; look for dysmenorrhea or dyspareunia suggesting endometriosis or irregular cycles suggesting PCOS.
Diagnosis
Hysterosalpingography (HSG) is the gold standard for tubal patency; Day 3 FSH/Estradiol assesses ovarian reserve.
Treatment
Letrozole is the first-line ovulation induction agent for PCOS; ovarian hyperstimulation syndrome is a major risk of gonadotropins.
Prognosis
Cumulative pregnancy rates are 80-90% within 2 years for couples with unexplained infertility; success declines sharply after age 40.
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Epidemiology & Etiology
Infertility affects approximately 15% of reproductive-age couples. Primary causes include ovulatory dysfunction (30-40%), tubal disease, and endometriosis. Advanced maternal age leads to decreased oocyte quality and quantity.
Pertinent Anatomy
The fallopian tubes must be patent for fertilization to occur. The cervical mucus must be receptive to sperm, and the uterine cavity must be free of structural anomalies like fibroids or septa.
Pathophysiology
Ovulatory dysfunction often stems from hypothalamic-pituitary-ovarian axis disruption, commonly seen in PCOS. Tubal factor infertility results from scarring, often secondary to Pelvic Inflammatory Disease or prior surgery. Endometriosis causes chronic inflammation and adhesions that distort pelvic anatomy.
Clinical Manifestations
Patients may present with oligomenorrhea or amenorrhea. Endometriosis classically presents with cyclic pelvic pain and dyspareunia. Red flags include signs of androgen excess (hirsutism) or galactorrhea, which may indicate hyperprolactinemia.
Diagnosis
Initial workup includes Day 3 FSH and AMH to evaluate ovarian reserve. Hysterosalpingography (HSG) is the gold standard to confirm tubal patency. A mid-luteal phase progesterone level >3 ng/mL confirms ovulation.
Treatment
For ovulatory dysfunction, Letrozole is preferred over clomiphene. If tubal disease is present, In Vitro Fertilization (IVF) is the definitive treatment. Ovarian hyperstimulation syndrome is a life-threatening complication of gonadotropin therapy, characterized by massive ovarian enlargement and ascites.
Prognosis
Success rates are highly dependent on maternal age. Ectopic pregnancy is a significant risk factor following assisted reproductive technology. Patients should be counseled on the declining success rates after age 40.
Differential Diagnosis
PCOS: irregular menses and hyperandrogenism
Endometriosis: chronic pelvic pain and dyspareunia
Tubal factor: history of PID or chlamydia
Uterine fibroids: heavy menses and enlarged uterus
Hyperprolactinemia: galactorrhea and amenorrhea