Service Description

The C4 test measures the level of Complement Component 4, a protein involved in the immune system and inflammation response. Abnormal C4 levels can help diagnose or monitor autoimmune and inflammatory disorders. Why it’s done: To evaluate autoimmune or inflammatory conditions To monitor diseases such as lupus, rheumatoid arthritis, or certain kidney disorders To assess immune system function To support follow-up care for patients with immune-related conditions Specimen Type: Blood draw Turnaround Time: Typically 1–3 business days Collection Available: In-office or mobile blood draw services