<prompt> Answer this question truthfullyWhat are the laboratory results that indicate polyarteritis nodosa?  <response>: <reason> There are no specific lab tests for diagnosing polyarteritis nodosa. Diagnosis is generally based upon the physical examination and a few laboratory studies that help to confirm the diagnosis. Laboratory findings consistent with the diagnosis of polyarteritis nodosa include CBC may show: Leukocytosis Normochromic anemia thrombocytosis ESR and C-reactive protein These can be helpful to diagnose active disease. Perinuclear pattern of antineutrophil cytoplasmic antibodies p-ANCA - not associated with classic polyarteritis nodosa, but is present in a form of the disease affecting smaller blood vessels, known as microscopic polyangiitis or leukocytoclastic angiitis. Hepatitis B surface antigen and hepatitic C serologies Patients with HBV related polyarteritis nodosa show: Decreased levels of serum C3 and C4. Circulating immune complexes Cryoglobulins Elevated levels of liver enzymes Elevated creatinine level Hypergammaglobulinemia Seen in 30 patients with polyarteritis nodosa. 