Test/Profile NameAnti SS-B (La) Antibody
SS-B/La is an extractable nuclear antigen (ENA) composed of a 48-kD protein combined with RNA species. SS-B/La antibodies are found primarily in patients with Primary Sjogren syndrome or lupus erythematosus (LE), where they occur with frequencies of approximately 40-50% and 15%, respectively. SS-B/La antibodies occur only infrequently in the absence of SS-A/Ro antibodies. It is useful for evaluating patients with signs and symptoms of a connective tissue disease in whom the test for antinuclear antibodies is positive.
Specimen Type and Minimal VolumeVariable Please confirm with the laboratory prior to testing.