Common variable immunodeficiency
Common variable immunodeficiency (CVID) is an immune system disorder that impairs your ability to fight infection. It's characterized by low serum levels of all immunoglobulins. People with CVID may present with repeated infections, such as sinus infections, ear infections, pneumonia, and blood infections. They're also at higher risk for other problems, such as autoimmune diseases (diseases where the body mistakenly attacks its tissues), like autoimmune hemolytic anemia, and can also have cancer and gastrointestinal issues. CVID is diagnosed through blood tests through quantitative measurements of the immunoglobulins.