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Zorluk: OrtaMenstrual Cycle Abnormalities and Contraception

A 23-year-old female collegiate cross-country runner comes to the university health center because she has not had a menstrual period for 8 months. Her body mass index (BMI) is 17.8 kg/m². She mentions intense training for an upcoming national competition and strict caloric restriction. Arrange the following diagnostic and management steps in the most appropriate sequential order for evaluating and managing this patient.

  1. 1Perform a urine or serum beta-hCG test
  2. 2Measure serum thyroid-stimulating hormone (TSH) and prolactin levels
  3. 3Measure serum follicle-stimulating hormone (FSH) and estradiol levels
  4. 4Perform magnetic resonance imaging (MRI) of the brain
  5. 5Perform a dual-energy x-ray absorptiometry (DEXA) scan

Cevap

The correct sequence is: Beta-hCG test, followed by TSH and prolactin levels, then FSH and estradiol levels, followed by an MRI of the brain, and finally a DEXA scan.
The correct sequence follows the established clinical algorithm for secondary amenorrhea. The first step is always to rule out pregnancy with a beta-hCG test. Once excluded, common endocrine causes like hypothyroidism and hyperprolactinemia are evaluated using TSH and prolactin levels. If those are normal, the axis is evaluated with FSH and estradiol to differentiate between hypergonadotropic and hypogonadotropic states. In this patient with likely functional hypothalamic amenorrhea (hypogonadotropic hypogonadism), a brain MRI is then required to exclude structural central lesions, making functional hypothalamic amenorrhea a diagnosis of exclusion. Finally, because this condition causes a chronic hypoestrogenic state, a DEXA scan is indicated to assess for bone mineral density loss, which is a major complication of the female athlete triad.

Adım Adım Çözüm

1
Rule out pregnancy
Perform a beta-hCG test
Pregnancy is the most common cause of secondary amenorrhea and must be excluded before any further workup.
2
Exclude other common endocrine causes
Measure TSH and prolactin
Hypothyroidism and prolactinomas are easily diagnosable causes of amenorrhea that must be assessed early in the algorithm.
3
Determine the level of the hypothalamic-pituitary-ovarian axis dysfunction
Measure FSH and estradiol
Low estradiol with low or inappropriately normal FSH confirms hypogonadotropic hypogonadism.
4
Rule out central structural lesions
Perform a brain MRI
Even in a classic presentation of the female athlete triad, structural lesions of the hypothalamus or pituitary must be excluded before making a diagnosis of functional hypothalamic amenorrhea.
5
Assess for complications of chronic hypoestrogenism
Perform a DEXA scan
Patients with established functional hypothalamic amenorrhea are at high risk for bone mineral density loss and require evaluation for osteopenia or osteoporosis.

Anahtar Kavram

The step-wise diagnostic evaluation of secondary amenorrhea begins with excluding pregnancy, followed by identifying common endocrine abnormalities, distinguishing central from ovarian causes, ruling out structural brain lesions, and finally managing the complications of the established diagnosis.
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Menstrual Cycle Abnormalities and Contraception

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