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Zorluk: OrtaOrdering Laboratory Tests

Which of the following laboratory evaluations is the most appropriate initial diagnostic step for each patient presentation? Match each clinical vignette with its indicated targeted initial laboratory test.

  • A 68-year-old man presents with a 2-month history of worsening lower back pain, fatigue, and recent onset of constipation. Laboratory results show a serum calcium of 11.2 mg/dL and a normocytic anemia.Serum and urine protein electrophoresis with immunofixation
  • A 35-year-old woman presents with episodes of severe, throbbing headaches accompanied by profuse sweating and palpitations. During an episode in the clinic, her blood pressure is 185/110 mmHg and her heart rate is 115/min.Plasma fractionated metanephrines
  • A 48-year-old man presents with chronic, watery diarrhea and episodic flushing of his face and neck. Physical examination reveals a holosystolic murmur at the left lower sternal border that increases with inspiration.24-hour urine 5-hydroxyindoleacetic acid (5-HIAA) level
  • A 42-year-old man presents with severe, burning epigastric pain and chronic diarrhea. Endoscopy reveals multiple large ulcers in the duodenal bulb and the distal duodenum, as well as prominent gastric folds.Fasting serum gastrin level
  • A 51-year-old woman presents with worsening joint pain, increased sweating, and enlarging hands and feet over the past several years. She also reports a recent diagnosis of type 2 diabetes mellitus and hypertension.Serum insulin-like growth factor 1 (IGF-1) level

Cevap

Vignette 1 matches with protein electrophoresis. Vignette 2 matches with plasma fractionated metanephrines. Vignette 3 matches with 24-hour urine 5-HIAA. Vignette 4 matches with fasting serum gastrin. Vignette 5 matches with serum IGF-1.
Each clinical vignette provides classic hallmark features of a specific systemic disease that requires a highly specific initial laboratory test to establish the diagnosis. Matching these correctly demonstrates an understanding of appropriate test sequencing and clinical pattern recognition.

Adım Adım Çözüm

1
Analyze the clinical features of each vignette to identify the most likely underlying diagnosis.
Identified suspected diagnoses: Multiple myeloma (Vignette 1), Pheochromocytoma (Vignette 2), Carcinoid syndrome (Vignette 3), Zollinger-Ellison syndrome (Vignette 4), and Acromegaly (Vignette 5).
Accurate pattern recognition of systemic syndromes is necessary before selecting the appropriate initial laboratory test.
2
Determine the most appropriate initial, non-invasive, or highly sensitive laboratory screening test for each identified condition.
Matched each condition to its initial diagnostic biomarker assay.
Standard of care requires establishing a biochemical diagnosis using specific targeted tests prior to pursuing invasive testing or imaging studies.

Anahtar Kavram

Appropriate initial diagnostic laboratory testing relies on correctly identifying syndromic clinical presentations (e.g., neuroendocrine tumors, plasma cell dyscrasias) and selecting the most sensitive or specific initial biochemical screening assay.
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Ordering Laboratory Tests

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