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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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A 31-year-old man presents to the office with complaints of multiple episodes of blood in his urine as well as coughing of blood for the past 3 days. He also reports a decrease in urinary frequency, and denies pain with urination. No previous similar symptoms or significant past medical history is noted. There is no history of bleeding disorders in his family. His vitals include a blood pressure of 142/88 mm Hg, a pulse of 87/min, a temperature of 36.8°C (98.2°F), and a respiratory rate of 11/min. On physical examination, chest auscultation reveals normal vesicular breath sounds. Abdominal exam is normal. The laboratory results are as follows:
Complete blood count
Hemoglobin 12 g/dL
RBC 4.9 x 106 cells/µL
Hematocrit 48%
Total leukocyte count 6,800 cells/µL
Neutrophils 70%
Lymphocyte 25%
Monocytes 4%
Eosinophil 1%
Basophils 0%
Platelets 200,000 cells/µL
    Urine examination
pH 6.2
Color dark brown
RBC 18–20/HPF
WBC 3–4/HPF
Protein 1+
Cast RBC casts
Glucose absent
Crystal none
Ketone absent
Nitrite absent 
24 hours urine protein excretion  1.3 g
A renal biopsy under light microscopy shows a crescent formation composed of fibrin and macrophages. Which of the following best describes the indirect immunofluorescence finding in this condition?
assistant
Linear immunofluorescence deposits of IgG and C3 along GBM