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Zorluk: ZorOrdering Laboratory Tests

Match each patient's clinical presentation of amenorrhea with the most appropriate targeted laboratory test or panel to establish the diagnosis.

  • A 24-year-old phenotypic female presenting with primary amenorrhea, normal breast development, sparse pubic and axillary hair, and a surgically confirmed blind-ending vagina.Serum karyotype and testosterone level
  • A 19-year-old female presenting with primary amenorrhea, lack of breast development, a normal uterus on pelvic ultrasound, and a lifelong inability to smell.Serum follicle-stimulating hormone (FSH) and luteinizing hormone (LH) levels
  • A 28-year-old female presenting with secondary amenorrhea, recent-onset temporal balding, deepening of her voice, and rapidly progressive clitoromegaly over four months.Serum total testosterone and dehydroepiandrosterone sulfate (DHEA-S) levels
  • A 34-year-old female presenting with a 6-month history of secondary amenorrhea, spontaneous bilateral galactorrhea, and a negative urine human chorionic gonadotropin test.Serum prolactin and thyroid-stimulating hormone (TSH) levels

Cevap

Presentation 1 matches with Karyotype/Testosterone; Presentation 2 matches with FSH/LH; Presentation 3 matches with Testosterone/DHEA-S; Presentation 4 matches with Prolactin/TSH.
The correct pairings directly address the unique pathophysiologic mechanisms of each amenorrhea presentation. CAIS requires genetic and hormonal confirmation to distinguish it from anatomic anomalies. Kallmann syndrome requires confirmation of central hypogonadism. Rapid virilization necessitates localizing the exact androgen source (ovary vs. adrenal). Galactorrhea workups must always include TSH due to the functional TRH-prolactin axis.

Adım Adım Çözüm

1
Analyze the first clinical presentation (primary amenorrhea, normal breasts, absent pubic hair, blind vagina).
Identify suspicion for Complete Androgen Insensitivity Syndrome.
To confirm CAIS and rule out Mullerian agenesis, chromosomal sex (karyotype) and hormonal profile (testosterone) must be assessed.
2
Analyze the second clinical presentation (primary amenorrhea, absent breasts, anosmia).
Identify suspicion for Kallmann syndrome (GnRH deficiency).
Anosmia with delayed puberty points to a failure of GnRH neuronal migration. Low FSH and LH definitively confirm central hypogonadism.
3
Analyze the third clinical presentation (secondary amenorrhea, rapid severe virilization).
Identify suspicion for an androgen-secreting tumor.
Markedly elevated testosterone suggests an ovarian source, whereas markedly elevated DHEA-S points to an adrenal source.
4
Analyze the fourth clinical presentation (secondary amenorrhea, galactorrhea, negative UPT).
Identify suspicion for hyperprolactinemia driven by either a prolactinoma or primary hypothyroidism.
Because TRH stimulates prolactin release, severe primary hypothyroidism can present with galactorrhea. Thus, both Prolactin and TSH levels are mandatory.

Anahtar Kavram

Targeted laboratory evaluation of amenorrhea relies on identifying specific clinical phenotypes (e.g., severe hyperandrogenism, galactorrhea, olfactory deficits, or anatomic anomalies) to select the most cost-effective and diagnostically accurate initial hormonal assays.
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Ordering Laboratory Tests

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