Rheumatoid Factor – Elevated RF is found in collagen vascular diseases such as SLE, rheumatoid arthritis, scleroderma, Sjogren’s syndrome, and in other conditions such as leprosy, tuberculosis, syphilis, malignancy, thyroid disease and in a significant percentage of otherwise normal elderly patients.

SST, Serum. Volume 1 (0.5) mL. Stability: Ambient – 72 Hours, Refrigerated – 7 Days, Frozen – 2 Months