Abnormality of complement system

What it means

An abnormality of the complement system.

The complement system represents a family of over 25 serum proteins and cell surface receptors that act in a cascade manner leading to innate functions such as inflammation and enhancement of adaptive immunity. Three general pathways, i.e. classical, lectin and alternative, activate the complement system.

Rare diseases that can present with this5

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