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Immunoglobulin IgG

Immunoglobulin IgG

Immunoglobulin G (IgG) is the most abundant antibody in your blood, forming a critical part of your immune defence. Measuring IgG provides a comprehensive view of your long-term immunity and overall immune resilience.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Male Your group

g/l

Low 7 Normal 16 High

Female Your group

g/l

Low 7 Normal 16 High

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Immunoglobulin IgG: what this test measures

This test measures the concentration of IgG antibodies in your blood. IgG represents approximately 75% of all serum antibodies and is essential for maintaining immunological memory.

Immunoglobulin IgG: why this value matters

IgG levels can provide insight into how well your immune system is functioning. Abnormal levels may indicate an underlying immune deficiency, chronic infection, or autoimmune condition. Monitoring IgG is particularly important for individuals who experience recurrent infections.

Immunoglobulin IgG: when is testing worthwhile?

Testing may be recommended when you experience frequent or recurring infections, when an immune deficiency is suspected, or as part of an autoimmune workup. Consult a healthcare professional for interpretation of results.

Immunoglobulin IgG: symptoms of a high or low value

Low Levels

Recurrent respiratory infections, frequent sinus infections, chronic ear infections, persistent gastrointestinal issues, slow wound healing, unexplained fatigue

High Levels

Joint pain or swelling, persistent fatigue, unexplained skin rashes, chronic inflammation, liver-related symptoms, prolonged low-grade fever

Immunoglobulin IgG: lifestyle and this value

Maintaining a balanced diet rich in vitamins and minerals can support immune function. Regular exercise, adequate sleep, and stress management are also associated with a healthy immune system. Avoid smoking and limit alcohol consumption to support overall immune health.

Immunoglobulin IgG: frequently asked questions

What is the difference between IgG and other immunoglobulins?

IgG is the most abundant antibody and provides long-term immunity. IgM responds to new infections first, while IgA protects mucosal surfaces. Each plays a different role in immune defence.

Can IgG levels change over time?

Yes, IgG levels can fluctuate due to infections, medications, or underlying health conditions. Persistent abnormal levels should be discussed with a healthcare professional.

Do I need to fast before an IgG test?

Fasting is generally not required for an IgG blood test. However, follow any specific instructions provided by your healthcare provider or testing service.

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Medical standards

Dr. Naimi oversees the medical standards behind our content and assessments.

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