Sample Requirements:
SST tube
Purpose:
Assesses autoimmune activity in conditions like lupus, RA, and Sjögren’s syndrome. Tests include ANA (screening), dsDNA (specific for lupus), complement C3/C4 (immune activation), and ENA profile for other connective tissue diseases. Abnormal results require clinical correlation.
Reference Range:
ANA: Negative (<1:40 titer); Anti-dsDNA: <10 IU/mL; C3: 90–180 mg/dL; C4: 10–40 mg/dL. Positive results suggest autoimmune disease, but clinical correlation is required.