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Zorluk: OrtaReproductive Endocrinology and Infertility

A 27-year-old woman presents to the clinic with an 8-month history of absent menses. She previously had regular 28-day menstrual cycles. Her body mass index is 22 kg/m 2^2 and physical examination is unremarkable. A urine β\beta-hCG test performed in the office today is negative. Arrange the following steps in the classic diagnostic algorithm for secondary amenorrhea in the correct chronological sequence, from initial evaluation to final definitive testing.

  1. 1Measurement of serum TSH, prolactin, and FSH levels
  2. 2Administration of a progestin challenge test
  3. 3Administration of an estrogen-progestin challenge test
  4. 4Performance of hysteroscopy or hysterosalpingography

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The correct sequence for the evaluation of secondary amenorrhea after a negative pregnancy test is: 1) Serum TSH, prolactin, and FSH, 2) Progestin challenge test, 3) Estrogen-progestin challenge test, 4) Hysteroscopy or hysterosalpingography.
The correct sequence follows the standard diagnostic algorithm for secondary amenorrhea. After ruling out pregnancy, the first step is non-invasive laboratory testing (TSH, prolactin, FSH) to identify common endocrine causes. If these are normal, a progestin challenge test evaluates endogenous estrogen levels and outflow tract patency. A negative progestin challenge prompts an estrogen-progestin challenge to determine if the lack of bleeding is due to severe hypoestrogenism or an anatomic abnormality. Finally, a negative estrogen-progestin challenge indicates a structural defect (e.g., Asherman syndrome), requiring invasive structural evaluation with hysteroscopy or hysterosalpingography.

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1
Exclude pregnancy and assess initial systemic endocrine function.
Measure serum TSH, prolactin, and FSH levels.
Pregnancy is the most common cause of secondary amenorrhea. Once excluded, thyroid disease, prolactinomas, and ovarian failure must be evaluated first via basic laboratory testing.
2
Assess endogenous estrogen status and outflow tract patency.
Perform a progestin challenge test.
Administering exogenous progestin for several days and observing for withdrawal bleeding confirms the presence of an estrogen-primed endometrium and a patent outflow tract, which is typical in anovulatory states.
3
Differentiate between hypoestrogenism and anatomic defects if the progestin challenge is negative.
Perform an estrogen-progestin challenge test.
If there is no bleeding after progestin alone, providing both estrogen (to proliferate the endometrium) and progestin will induce bleeding if the issue was merely a lack of endogenous estrogen (e.g., functional hypothalamic amenorrhea). No bleeding points to an anatomic issue.
4
Evaluate the structural integrity of the uterine cavity.
Perform hysteroscopy or hysterosalpingography.
If cyclical estrogen and progestin fail to produce menses, the endometrium is unresponsive or scarred, indicating an anatomic defect that requires direct visualization or imaging for diagnosis.

Anahtar Kavram

The diagnostic algorithm for secondary amenorrhea follows a stepwise approach to differentiate among pregnancy, endocrine dysfunction, hypoestrogenism, and anatomic outflow tract obstruction.
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Reproductive Endocrinology and Infertility

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