A complement C4 (also known as a complement component 4, or simply C4) is a test to measure the level of C4 proteins you have in your blood. These proteins play a role in how your immune system ...
Complement C5a is a known mediator of inflammatory and neuropathic pain. In a new study, patients with NMOSD who were in remission and healthy controls were asked to rate their pain on a visual analog ...