Accurate interpretation of serum hormone levels is a critical first step in evaluating patients presenting with ovulatory dysfunction and infertility. Match each distinct reproductive laboratory profile below with the most likely corresponding etiology.
- Markedly elevated FSH, elevated LH, and profoundly decreased estradiolPrimary ovarian insufficiency
- Decreased or low-normal FSH and LH, and decreased estradiolFunctional hypothalamic amenorrhea
- Normal FSH, elevated LH, normal estradiol, and elevated total testosteronePolycystic ovary syndrome
- Normal or decreased FSH and LH, decreased estradiol, and significantly elevated prolactinProlactin-secreting pituitary adenoma
- Normal FSH and LH, normal estradiol, elevated testosterone, and markedly elevated 17-hydroxyprogesteroneNon-classic congenital adrenal hyperplasia
Answer
The accurate pairings match specific hormonal feedback states to their origins: hypergonadotropic hypogonadism (Primary ovarian insufficiency), hypogonadotropic hypogonadism (Functional hypothalamic amenorrhea), altered LH:FSH ratio with hyperandrogenism (Polycystic ovary syndrome), prolactin-induced GnRH suppression (Prolactinoma), and isolated adrenal precursor accumulation (Non-classic CAH).
Correct diagnosis of infertility and ovulatory dysfunction relies on understanding the HPO feedback loop. An end-organ failure at the ovary removes negative feedback, causing the pituitary to secrete massive amounts of FSH and LH. Conversely, if the hypothalamus is suppressed (via stress or excess prolactin), it fails to stimulate the pituitary, resulting in low FSH and LH. Finally, conditions of androgen excess (PCOS, NCCAH) can disrupt normal ovulatory cycling while leaving basal estradiol production relatively intact, distinguishable primarily by specific markers like LH ratios or 17-OHP.
Step-by-Step Solution
Key Concept
Interpretation of the Hypothalamic-Pituitary-Ovarian (HPO) axis laboratory profiles in ovulatory dysfunction.