Beware of 'normal' creatine kinase levels in HIV-associated polymyositis

Viral Infections of the Human Nervous System

“…Elevated creatine kinase (CK) levels are the most prominent laboratory abnormality, with values approximately 2,500 IU/L in two of the larger case series; CK levels, however, are not always elevated, and levels do not correlate with weakness severity (Simpson et al 1993;Kenyon et al 2010). The presence of autoantibodies is infrequent.…”