Many different lab tests are used to find changes in your body that can happen with lupus. The results of each test help your doctor get a fuller picture of your health. Because lab tests alone can’t ...

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 ...

The following transcript is automatically generated and may contain typos or misspellings. Please listen to the episode for the most accurate language. Host 0:00 Welcome to The Expert Series brought ...