Autoimmune - Bloody Good
Immune System Health

Immunoglobulin G (IgG) Test

The Immunoglobulin G (IgG) test measures the most common type of antibody in the blood. IgG plays a key role in defending against bacterial and viral infections and provides long-term immunity after exposure or vaccination. Abnormal IgG levels can indicate immune deficiencies, chronic infections, autoimmune conditions, or certain allergies. This test is often used to assess immune system health, investigate recurrent infections, and monitor immune-related disorders.

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Immunoglobulin G (IgG) Test

Experiencing recurrent infections, want comprehensive immune system assessment, or need evaluation of your long-term immunity and immune strength?

Overview

Think of the Immunoglobulin G (IgG) test as checking your immune system's memory bank. IgG antibodies are like your body's security guards that remember every infection or vaccination you've encountered, staying on patrol in your bloodstream to provide long-lasting protection. These antibodies are your most abundant defenders, making up the backbone of your long-term immunity and even protecting newborns by crossing from mother to baby during pregnancy.

This test reveals whether your immune system has the right amount of these protective antibodies to keep you healthy. Low IgG levels might explain why you're getting sick frequently, as it could signal that your immune system isn't producing enough defenders to fight off infections effectively. On the flip side, unusually high levels might indicate your body is working overtime to battle a chronic infection or dealing with an autoimmune condition where your immune system is overactive. Understanding your IgG levels helps determine if recurrent illnesses are due to immune deficiency and whether you might benefit from treatments to boost your body's natural defenses.

Reviewed by Dr. Vu Tran
Bloody Good’s Chief Medical Officer

Symptoms

You may benefit from this test if you experience:
Frequent infections (more than 4 colds per year) Infections that are severe or long-lasting Slow healing of cuts or wounds Chronic fatigue possibly related to infection

Purpose

Essential for individuals with recurrent infections, suspected immune deficiency, chronic illness affecting immunity, or anyone needing comprehensive immune function evaluation.

How to prepare

No special preparation required. Inform healthcare provider of recent infections, vaccinations, or medications that might affect immune function, as these can influence IgG levels and interpretation.

Understanding results

Results show IgG levels compared to age-appropriate normal ranges. Low levels may indicate immune deficiency, while elevated levels may suggest chronic infection, inflammation, or autoimmune conditions.

After the test

Address abnormal IgG levels through comprehensive immune evaluation, treatment of underlying conditions, immune support measures, or immunoglobulin replacement therapy if deficiency is confirmed. Work with immunologists for specialized care.

Frequently Asked Questions

  • Low IgG typically indicates immune deficiency, which can be primary (genetic) or secondary (due to medications, illness, or other factors), potentially increasing susceptibility to infections and requiring further evaluation.
  • Elevated IgG may indicate chronic infection, autoimmune disease, liver disease, or certain blood disorders, requiring clinical correlation and additional testing for proper diagnosis.
  • IgG provides long-term immunity and is the most abundant antibody, while IgM indicates recent infection and IgA protects mucosal surfaces - each serves different immune functions.
  • Yes, IgG levels can change due to infections, vaccinations, medications, aging, or underlying health conditions, which is why monitoring may be needed in certain situations.
  • IgG deficiency is a condition where IgG levels are below normal, potentially causing recurrent infections and may require treatment with immunoglobulin replacement therapy or other immune support measures.
  • Treatment may include immunoglobulin replacement therapy, prophylactic antibiotics, lifestyle modifications to reduce infection risk, and management of underlying conditions affecting immune function.
Immunoglobulin G (IgG) Test

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How it works

What to expect

We want you to feel bloody good—inside and out. Regular testing isn’t just about checking your current health; it helps you spot abnormal values you might not know about.

1

Book your referral

Choose the testing that suits your goals. After ordering, you will receive your referral by email.

2

Collect your sample

Easy sample collection at one of our 4000+ partner collection centres throughout Australia. Find nearest

3
Receive your results

Receive your results

View your lab results and receive a personalised review from the secure Bloody Good platform.

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