Immunoglobulin G

IgG is an important antibody that helps your body fight off infections, acting as a key player in your immune system.

📋 About This Biomarker

Immunoglobulin G, or IgG, is like one of the body's key security guards in your immune system. Imagine your body as a castle; IgG antibodies are diligent knights patrolling day and night, ready to defend against invaders like bacteria and viruses. They are the most common type of antibody found in your blood and other body fluids, making up about 75% of the antibodies in your body. IgG plays a crucial role in identifying and neutralising foreign substances, ensuring you stay healthy and protected against infections. By measuring IgG levels, we can get a clear picture of how well your immune system is functioning, revealing if it's strong and vigilant or if it might need some support.

🎯 Why We Test This

Testing IgG levels provides valuable insights into how well your immune system is working. If you're experiencing frequent infections, unexplained fatigue, or symptoms of autoimmune diseases, checking your IgG levels can help identify underlying issues. It assists in diagnosing immunodeficiencies, chronic infections, and autoimmune disorders, enabling timely and appropriate treatment. For people undergoing treatments that affect the immune system, like chemotherapy, monitoring IgG levels helps manage potential side effects and maintain immune health. Overall, it's a useful tool for ensuring your body’s defences are in good shape.

⚠️ What Affects It

Several factors can influence IgG levels in the body. Your overall health is a significant factor - conditions that weaken the immune system, like certain infections or diseases, can lower IgG levels. Age also plays a role; infants and young children have lower IgG levels as their immune systems are still developing. Lifestyle choices such as nutrition and stress levels can impact IgG production too. On the other hand, chronic infections, autoimmune diseases, or certain types of cancers can cause IgG levels to rise. Medications, especially immunosuppressants or steroids, can also affect IgG levels, altering how the immune system responds.

📈 How to Improve

If your IgG levels are high or nearing high, it's important to identify and address the underlying cause. This might involve treating chronic infections or managing autoimmune conditions with the help of a healthcare provider. Lifestyle changes, such as reducing stress and following a healthy diet, can also support immune balance. When IgG levels are low or close to low, boosting your immune system becomes the focus. This can include improving nutrition, getting adequate sleep, and possibly receiving immunoglobulin replacement therapy as recommended by a doctor. Avoiding exposure to infections, staying up-to-date with vaccinations, and leading a healthy lifestyle are all ways to help normalise IgG levels and strengthen your immunity. Regular monitoring and working closely with a healthcare professional are key steps in managing IgG levels effectively.

📊 Understanding Your Results (g/L)

Low (< 7 g/L)
Low IgG levels indicate that your immune system isn't producing enough antibodies to effectively protect against infections. This condition is known as immunodeficiency. It can be due to various reasons, such as genetic factors, certain infections like HIV, or as a side effect of treatments like chemotherapy. People with low IgG levels may experience frequent infections, especially of the respiratory or gastrointestinal tracts. Identifying low IgG levels is important so that steps can be taken to boost immunity, which may include treatments to replace IgG or other therapies to strengthen the immune system.
Optimal (7 - 16 g/L)
Having IgG levels within the normal range is a good sign - it means your immune system is functioning properly. Your body is well-equipped to recognise and fight off infections, keeping you healthy. It reflects a balanced immune response, indicating that your immune defences are neither overactive nor underactive. This balance is crucial for maintaining overall health and preventing illnesses. If your IgG levels are approaching the higher end of normal, it may suggest that your immune system is currently active, possibly due to a recent or mild infection. It might also be an early sign of an autoimmune response beginning to develop. While it doesn't necessarily indicate a serious problem, it's a signal to keep an eye on your health. Monitoring these levels over time can help detect any upward trends, allowing for early intervention if needed. Engaging in a healthy lifestyle and consulting with a healthcare provider can help manage and understand these levels better. When IgG levels are nearing the lower limit, it might suggest that your immune system is slightly weakened or not as active as it could be. This could make you a bit more susceptible to infections than usual. Factors like stress, poor nutrition, or minor immunodeficiencies might contribute to this. It's a gentle reminder to take care of your health - ensuring you're eating well, getting enough rest, and possibly consulting a healthcare provider to check if anything else might be affecting your immune system.
High (> 16 g/L)
When IgG levels are higher than normal, it can be a sign that the immune system is in overdrive. This might happen during chronic infections, where the body is continuously fighting off invaders. It can also indicate autoimmune disorders, where the immune system mistakenly attacks the body's own tissues, thinking they are foreign. Conditions like rheumatoid arthritis or lupus are examples of such autoimmune diseases. In some cases, elevated IgG levels might point towards certain types of blood cancers, such as multiple myeloma or chronic lymphocytic leukaemia. Recognising high IgG levels helps in diagnosing these conditions early and managing them effectively.