[Answered]: A 30-year-old male experiences respiratory…

A 30-year-old male experiences respiratory difficulty followed by the appearance of blood-streaked sputum. He delays visiting the physician until symptoms of extreme fatigue and red urine are present. A chest radiograph shows pulmonary infiltration and sputum culture is negative for pathogens. Blood tests indicate anemia, increased BUN, and increased creatinine Urinalysis results are as follows: Appearance: red & cloudy Glucose: negative Bilirubin: negative Ketones: negative Specific gravity: 1.015 Blood: large pH: 6.0 Protein: 3+ Urobilinogen: 0.2 EU/dL Nitrite: negative Leukocyte esterase: trace Microscopic findings: 10-15 WBCs/hpf TNTC RBCs/hpf 0-3 hyaline casts/lpf 0-3 granular casts/lpf 0-2 RBC casts/lpf a) What is the differential diagnosis? b) What further tests may be run to determine a diagnosis?