A 30-year-old woman presents to a physician with rather non-specific complaints of fatigue, malaise, low-grade fever, and arthralgias. Screening serum chemistries demonstrate an elevated BUN. The urine shows proteinuria. Testing for which of the following will be most helpful for making the diagnosis?
A. Anticentromeric antibody
B. Antimitochondrial antibody
C. Antinuclear antibody
D. Anti-TSH receptor antibody
E. Rheumatoid factor
A. Anticentromeric antibody
B. Antimitochondrial antibody
C. Antinuclear antibody
D. Anti-TSH receptor antibody
E. Rheumatoid factor