Alpha chain disease is detected by –
**Core Concept**
Alpha chain disease, also known as selective IgA deficiency, is a disorder characterized by low levels or complete absence of immunoglobulin A (IgA) in the blood and other bodily secretions. It is a type of primary immunodeficiency disorder that affects the immune system's ability to produce antibodies.
**Why the Correct Answer is Right**
Alpha chain disease is typically detected by measuring the levels of IgA in the blood using immunoelectrophoresis or enzyme-linked immunosorbent assay (ELISA). These tests can detect the presence or absence of IgA antibodies, which helps diagnose alpha chain disease. The disease is often associated with impaired B-cell development and function, leading to reduced IgA production.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because alpha chain disease is not typically detected by measuring the levels of IgE, which is another type of immunoglobulin.
**Option B:** This option is incorrect because alpha chain disease is not typically detected by measuring the levels of complement proteins, which are proteins that help activate the immune response.
**Option C:** This option is incorrect because alpha chain disease is not typically detected by measuring the levels of immunoglobulin M (IgM), which is another type of antibody that plays a key role in the early stages of the immune response.
**Clinical Pearl / High-Yield Fact**
Alpha chain disease can increase the risk of infections and autoimmune disorders, making it essential for patients to receive regular vaccinations and take preventive measures to avoid infections.
**Correct Answer:** A. Immunoelectrophoresis or ELISA.