Selective IgA Deficiency

What is Selective IgA Deficiency?

Selective IgA deficiency is the most common immunodeficiency disorder. It happens when your body makes very little or no immunoglobulin A, a type of antibody that protects your mucous membranes. These membranes line your nose, throat, lungs, and digestive tract.

IgA antibodies are your first line of defense against infections in these areas. When you lack them, bacteria and viruses can more easily invade your body. Many people with this condition live normal lives without knowing they have it. Others experience frequent infections or develop autoimmune conditions.

The condition is diagnosed when IgA levels fall below 7 milligrams per deciliter in adults. Other antibody levels remain normal. This distinguishes selective IgA deficiency from more severe immune disorders. Most cases are discovered accidentally during routine blood work or when investigating repeated infections.

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Symptoms

Frequent sinus infections
Ear infections that keep coming back
Bronchitis or pneumonia
Chronic diarrhea
Stomach infections or intestinal problems
Allergies or asthma
Eczema or other skin rashes
Autoimmune conditions like celiac disease or lupus

Many people with selective IgA deficiency have no symptoms at all. Some only discover they have it during testing for another health concern. Others experience mild symptoms that they may not connect to an immune problem.

Causes and risk factors

Most cases of selective IgA deficiency are genetic. The condition tends to run in families and appears to involve multiple genes. In most people, the immune cells that should produce IgA fail to mature properly. Researchers are still studying why this happens.

Some medications can temporarily lower IgA levels, including certain seizure medications and immunosuppressants. Infections like rubella during pregnancy may also play a role. People of European descent have higher rates of this condition than other populations. The risk is about 1 in 500 people overall.

How it's diagnosed

Selective IgA deficiency is diagnosed through blood tests that measure immunoglobulin levels. A simple blood draw can check your IgA, IgG, and IgM antibody levels. If your IgA is very low or absent while other antibodies remain normal, you likely have this condition.

Rite Aid offers IgA testing as an add-on to help you understand your immune health. Your doctor may also order additional tests to check for associated conditions like celiac disease. The tissue transglutaminase antibody test can screen for celiac disease, which is more common in people with IgA deficiency. Getting tested helps you and your doctor create a plan to prevent infections and manage your health proactively.

Treatment options

Antibiotics to treat bacterial infections promptly when they occur
Preventive antibiotics for people with frequent infections
Avoiding live vaccines in some cases, based on your doctor's guidance
Treating associated conditions like allergies or autoimmune diseases
Good hygiene practices to reduce infection risk
Healthy diet rich in fruits, vegetables, and whole foods to support immune function
Adequate sleep and stress management to keep your immune system strong
Regular monitoring with blood tests to track your health

Frequently asked questions

Most cases are genetic and run in families. The immune cells that normally produce IgA antibodies fail to develop properly. Some medications and infections during pregnancy may contribute, but the exact cause is often unknown.

This is the most common primary immunodeficiency disorder. It affects about 1 in 500 people overall. People of European descent have higher rates than other populations.

There is no cure for selective IgA deficiency. Most people manage the condition by treating infections promptly and preventing complications. Many people live normal, healthy lives with proper care and monitoring.

Not necessarily. Many people with selective IgA deficiency have few or no symptoms. Others may experience frequent infections that need treatment. Your experience depends on how low your IgA levels are and your overall health.

Respiratory infections like sinusitis, ear infections, and bronchitis are most common. Digestive infections and diarrhea also occur more often. These infections affect the mucous membranes where IgA normally provides protection.

Most vaccines are safe for people with selective IgA deficiency. Your doctor may recommend avoiding certain live vaccines depending on your specific situation. Always discuss vaccination plans with your healthcare provider.

Yes, people with IgA deficiency have higher rates of autoimmune diseases and allergies. Celiac disease, lupus, and rheumatoid arthritis occur more frequently. Regular screening helps catch these conditions early.

In selective IgA deficiency, only IgA levels are low. Your other antibodies, IgG and IgM, remain normal. This makes it less severe than combined immunodeficiency disorders where multiple antibody types are affected.

A healthy diet supports overall immune function. Focus on whole foods, fruits, vegetables, and adequate protein. If you have celiac disease, following a strict gluten-free diet is essential for your gut health.

Your doctor will determine testing frequency based on your symptoms and health history. Annual testing may be helpful to monitor trends. More frequent testing may be needed if you develop new symptoms or conditions.