Match each patient's clinical presentation with the most appropriate targeted laboratory test or diagnostic panel to order next.
- A 42-year-old woman presenting with progressive proximal muscle weakness, a violaceous periorbital eruption, and erythematous scaling papules on the dorsal metacarpophalangeal joints.Creatine kinase, aldolase, and anti-Jo-1 antibodies
- A 68-year-old man with progressive fatigue, new-onset back pain, normocytic anemia, an elevated creatinine, and a serum calcium level of .Serum and urine protein electrophoresis with immunofixation, and serum free light chain assay
- A 34-year-old woman evaluated for episodic severe headaches, diaphoresis, tachycardia, and newly diagnosed treatment-resistant hypertension.Plasma free metanephrines or 24-hour urine fractionated metanephrines
- A 55-year-old man presenting with early satiety, massive splenomegaly, and a leukocyte count of with a complete myelocyte maturation spectrum.Peripheral blood reverse transcriptase-polymerase chain reaction for BCR-ABL1 transcript
Answer
The correct diagnostic laboratory workups are matched to their respective clinical syndromes: Dermatomyositis (muscle enzymes and anti-Jo-1), Multiple Myeloma (protein electrophoresis and free light chains), Pheochromocytoma (metanephrines), and Chronic Myeloid Leukemia (BCR-ABL1 testing).
Each clinical vignette contains highly specific pathognomonic clues that correlate directly with a singular definitive diagnostic or screening laboratory pathway. Accurate pattern recognition dictates these specific evidence-based laboratory orders.
Step-by-Step Solution
Key Concept
Cost-effective and accurate patient management requires recognizing classic clinical syndromes and ordering the single most specific initial diagnostic laboratory test or panel, avoiding non-directed shotgun testing.