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When testing for PML risk, doctors look for JC virus antibody levels in your blood. There isn't a simple "normal" range - instead, higher antibody levels indicate increased risk of developing PML. If you test positive for JC virus antibodies, you may still be able to take certain MS medications, but your risk level will be Show Full Answer

When testing for PML risk, doctors look for JC virus antibody levels in your blood. There isn't a simple "normal" range - instead, higher antibody levels indicate increased risk of developing PML. If you test positive for JC virus antibodies, you may still be able to take certain MS medications, but your risk level will be determined by your specific antibody levels.

Your doctor should monitor these levels every 6 months if you're taking immune-suppressing medications for MS. It's important to note that testing positive for JC virus is actually very common - most of the general population has been exposed to it. The risk only becomes significant when combined with certain MS treatments that suppress the immune system. Your neurologist will carefully monitor your levels and adjust treatment plans accordingly to minimize any risks.

 AI-generated responses are not a substitute for medical advice. These services are not intended to diagnose, treat, or cure any condition or disease. Always ask your doctor about specific health concerns.

JC Virus, PML, and Multiple Sclerosis