Anti-LAD-1 antibody positivity

What it means

The presence of autoantibodies (immunoglobulins) in the serum that react against LAD-1, which is the soluble 120 kDa ectodomain of BP180.

Bullous pemphigoid (BP) is an autoimmune blistering skin disease characterized by an autoimmune response to type XVII collagen (BP180). The generation of anti-BP180-NC16A IgG autoantibodies is considered to be central to the pathogenesis of BP, in part due to the close correlation between serum concentration and disease activity. However, about 60% of BP patients also generate IgG autoantibodies against LAD-1.

Rare diseases that can present with this1

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category