Additional Information

For BJH Laboratory Use Only

Testing only available for MS or Crohn's Disease patient program

The JC Virus (JCV) is associated with Progressive Multifocal Leukoencephalopathy (PML). Detection of antibodies to JCV in serum or plasma is an indicator of exposure to JCV. Negative results do not rule out the presence of JCV and positive results do not indicate disease secondary to JCV.  The analytical performance characteristics were determined for multiple sclerosis (MS) and Crohn's Disease patients.  The purpose of this test is to evaluate the risk of PML in patients with MS or Crohn's Disease prior to taking natalizumab.  This assay should not be used for the diagnosis or monitoring of PML.