Antineutrophil antibody positivity

What it means

The presence of autoantibodies in the serum that react against neutrophils.

Circulating serum antibodies are measured by flow cytometry after incubation with normal neutrophils. Values greater than 2 standard deviations of a normal control population are interpreted as weakly positive and greater than 3 standard deviations as positive.

Rare diseases that can present with this10

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, and Orphanet separately records 1 disease where this sign is specifically absent. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Antineutrophil antibodies · Neutrophil antibody positive