What is it used for?
A complement blood test is most often used to diagnose or monitor autoimmune disorders such as:
Lupus, a chronic disease affecting multiple parts of the body, including the joints, blood vessels, kidneys, and brain
Rheumatoid arthritis, a condition that causes pain and swelling of the joints, mostly in the hands and feet
It may also be used to help diagnose certain bacterial, viral, or fungal infections.
