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Zorluk: OrtaOrdering Laboratory Tests

As part of a quality improvement initiative, the nephrology department is reviewing the diagnostic workup algorithms for patients presenting with acute glomerulonephritis. Match the following patient clinical presentations to the most appropriate initial targeted serologic laboratory evaluation to order.

  • A 45-year-old man presenting with recurrent sinusitis, hemoptysis, and acute kidney injury with red blood cell casts.Proteinase 3 antineutrophil cytoplasmic antibody (PR3-ANCA)
  • A 28-year-old woman presenting with a malar rash, significant joint pain, and new-onset proteinuria with hematuria.Anti-double-stranded DNA (anti-dsDNA) antibodies and complement (C3, C4) levels
  • A 30-year-old man presenting with acute renal failure and massive pulmonary hemorrhage, but no upper respiratory tract symptoms.Anti-glomerular basement membrane (anti-GBM) antibodies
  • A 14-year-old boy presenting with gross hematuria and periorbital edema two weeks after a resolved sore throat.Antistreptolysin O (ASO) titer and anti-DNAse B

Cevap

Match the specific clinical presentations to their indicated serologic tests: the patient with sinusitis/hemoptysis matches PR3-ANCA, the patient with malar rash matches anti-dsDNA/complement, the patient with isolated pulmonary hemorrhage matches anti-GBM, and the patient with a recent sore throat matches ASO/anti-DNAse B.
Each specific etiology of acute glomerulonephritis presents with a characteristic clinical phenotype that dictates the initial laboratory workup. GPA features both upper and lower respiratory symptoms (indicated by PR3-ANCA). SLE features systemic autoimmune signs (indicated by anti-dsDNA and complement levels). Goodpasture disease presents with an isolated pulmonary-renal syndrome (indicated by anti-GBM antibodies). PSGN follows a recent streptococcal infection (indicated by ASO and anti-DNAse B).

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1
Analyze the clinical vignette describing recurrent sinusitis, hemoptysis, and acute kidney injury.
Identify this symptom triad as a classic presentation of Granulomatosis with polyangiitis (GPA).
Recognizing the distinct pattern of upper and lower respiratory tract involvement combined with nephritic syndrome is required to select the targeted PR3-ANCA test.
2
Evaluate the vignette detailing a young woman with a malar rash, joint pain, and proteinuria with hematuria.
Identify this as a flare of Systemic Lupus Erythematosus (SLE) complicated by lupus nephritis.
SLE flares with renal involvement necessitate ordering anti-dsDNA antibodies and complement levels (C3/C4) to confirm the etiology and assess ongoing disease activity.
3
Assess the vignette of a man with acute renal failure and isolated pulmonary hemorrhage.
Recognize this presentation as Goodpasture disease (pulmonary-renal syndrome).
The distinct lack of upper respiratory tract symptoms separates this from GPA, establishing anti-GBM antibodies as the most appropriate laboratory order.
4
Review the presentation of an adolescent with gross hematuria and periorbital edema two weeks following a sore throat.
Identify this as Post-streptococcal glomerulonephritis (PSGN).
The temporal relationship to pharyngitis indicates an immunologic reaction to a prior infection, which dictates ordering an ASO titer and anti-DNAse B test.

Anahtar Kavram

Targeted laboratory evaluation for glomerulonephritis etiologies relies on matching the distinct pattern of extrarenal clinical involvement to specific serologic markers.
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Ordering Laboratory Tests

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