A 19-year-old woman comes to the physician because of a 4-month history of joint pain of her knees and hips. A violaceous rash is seen on her nose and cheeks. Laboratory studies show:
Hemoglobin 10 g/dL
ESR 25 mm/hr
Blood urea nitrogen 35 mg/dL
Creatinine 1.7 mg/dL
Which of the following is most likely to be seen in this patient?
Anti-histone antibodies
Anti-microsomal antibodies
Anti-smooth muscle antibodies
Elevated serum kappa
Hilar adenopathy
Thrombocytopenia
