Immunoglobulin G4

IgG4 is a type of antibody that helps regulate your immune system, and measuring its levels can provide insights into certain immune-related conditions.

📋 About This Biomarker

IgG4 is a specific type of antibody, which is a protein produced by your immune system to help protect against infections. Think of antibodies as the body's security guards, always on patrol to spot and neutralise harmful invaders like bacteria and viruses. IgG4 is one of four subclasses of the IgG antibody and plays a unique role in regulating the immune system. It often acts as a "peacemaker," preventing the immune system from overreacting to certain stimuli. Measuring IgG4 levels in your blood can provide important insights into how your immune system is functioning. In some rare conditions, the body produces too much IgG4, leading to inflammation and potential damage in various organs like the pancreas, liver, or kidneys. By checking IgG4 levels, doctors can better understand what's happening inside your body and guide treatment to restore balance and health.

🎯 Why We Test This

Testing IgG4 levels can be important if there are signs of an immune system disorder, unexplained inflammation, or symptoms affecting various organs without a clear cause. It helps in diagnosing conditions like IgG4-related disease, which can impact the pancreas, liver, kidneys, and other organs. Early detection through testing allows for appropriate treatment to reduce inflammation and prevent organ damage. For those with certain allergies or autoimmune conditions, measuring IgG4 can also provide valuable information about how the immune system is behaving.

⚠️ What Affects It

Several factors can influence IgG4 levels. Certain medical conditions, such as IgG4-related disease, can cause elevated levels. This condition involves chronic inflammation and can affect various organs, leading to symptoms like swelling or pain. Allergies and some autoimmune diseases might also impact IgG4 levels, as they involve the immune system reacting to perceived threats. Medications that affect the immune system, infections, and even genetic factors can play a role too. While lifestyle factors like diet and exercise have less direct effect on IgG4 compared to other biomarkers, overall health and immune function can still influence levels.

📈 How to Improve

If IgG4 levels are high or nearing high, it's important to work closely with a healthcare provider. Treatment may involve medications like corticosteroids to reduce inflammation and calm the overactive immune response. Managing underlying conditions, following prescribed treatments, and maintaining a healthy lifestyle can support your immune system in returning to balance. If levels are low or approaching low, addressing any underlying issues is key. This might include therapies to boost the immune system, ensuring proper nutrition, and taking steps to avoid infections. Regular medical care and following your doctor's advice are essential to improving and maintaining healthy IgG4 levels.

📊 Understanding Your Results (mg/L)

Low (< 39 mg/L)
IgG4 levels within the normal range generally indicate that your immune system is functioning properly in this aspect. It's like a thumbs-up signal, showing that there's a balanced production of this antibody. This balance means your body is well-equipped to protect against infections without overreacting. Maintaining overall health through a balanced diet, regular exercise, and adequate sleep can help keep your immune system in good shape.
Optimal (39 - 864 mg/L)
IgG4 levels within the normal range generally indicate that your immune system is functioning properly in this aspect. It's like a thumbs-up signal, showing that there's a balanced production of this antibody. This balance means your body is well-equipped to protect against infections without overreacting. Maintaining overall health through a balanced diet, regular exercise, and adequate sleep can help keep your immune system in good shape. If IgG4 levels are approaching the upper limit of normal, it's like an early warning signal from your immune system. While not definitively abnormal, it suggests that something might be stirring beneath the surface. This could be an early indicator of IgG4-related disease or another immune system issue. Keeping an eye on these levels and possibly conducting additional tests can help catch any potential problems early. Early detection allows for timely intervention, which can prevent progression and promote better health outcomes. IgG4 levels near the lower end of normal are usually not a cause for concern. It might simply reflect individual variations, much like how people's heights vary. However, if levels are consistently low or if you experience frequent infections, it might indicate that your body isn't making enough of these antibodies. Consulting a healthcare provider can help determine if further evaluation is needed to ensure your immune system is adequately protecting you.
High (> 864 mg/L)
When IgG4 levels are higher than normal, it's a sign that the immune system is more active than usual in a specific way. This can indicate IgG4-related disease, where increased IgG4 leads to inflammation and tissue damage in various parts of the body. Imagine your immune system turning up the volume too high, causing disruption instead of harmony. Symptoms might include unexplained swelling, pain, or organ dysfunction. Elevated IgG4 can also be associated with certain allergic conditions or autoimmune disorders. It's important to work with a healthcare provider to determine the cause of the high levels and develop a treatment plan to reduce inflammation and restore balance.
Also known as: IgG4