What is Total IgG?
Total IgG measures the concentration of Immunoglobulin G, the most abundant antibody in the bloodstream. IgG plays a central role in long-term immune protection by recognizing and neutralizing viruses, bacteria, and other foreign invaders. It also helps the immune system "remember" past infections, providing immunity over time.
Why is Total IgG important?
IgG is essential for fighting infections and for the effectiveness of vaccinations. It circulates in the blood and tissues, identifying pathogens and helping to trigger a broader immune response. Total IgG measurement provides insight into the strength and status of your adaptive immune system.
Low Total IgG may indicate:
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Primary immunodeficiencies, such as Common Variable Immunodeficiency (CVID)
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Secondary immunodeficiencies due to chronic illness, malnutrition, or certain medications (e.g., chemotherapy, immunosuppressants)
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Protein loss, such as in nephrotic syndrome or severe burns
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Chronic lymphocytic leukemia (CLL) or other B-cell disorders
High Total IgG may indicate:
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Chronic infections, such as HIV, hepatitis, or tuberculosis
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Autoimmune diseases, including lupus or rheumatoid arthritis
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Liver diseases, especially chronic hepatitis and cirrhosis
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Monoclonal gammopathies, such as multiple myeloma or IgG-related MGUS
Who should consider testing Total IgG?
This test is especially useful for people with frequent or persistent infections, suspected immune deficiencies, chronic inflammation, or those undergoing immunosuppressive therapy. It is also helpful in evaluating unexplained fatigue or inflammatory symptoms.
Clinical note:
Persistent imbalances in IgG levels may indicate an underlying immune dysfunction. High levels often reflect chronic immune activation, while low levels can leave the body vulnerable to infections and poor vaccine responses.
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What does it mean if your Total IgG result is too low?
A low Total IgG result on the Vibrant America Neural Zoomer Plus panel generally suggests that your immune system may not be producing enough IgG antibodies. IgG is the most abundant immunoglobulin in the body and plays a key role in long-term immune defense.
Because this panel is primarily designed to detect neural autoantibodies—not to diagnose immune deficiency—a low IgG result should always be confirmed with a standard quantitative serum IgG test.
Possible reasons for low Total IgG
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Primary immune deficiency
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Common Variable Immunodeficiency (CVID)
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Selective IgG subclass deficiency
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Secondary/acquired causes
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Chronic corticosteroid or immunosuppressant use
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Hematologic cancers (CLL, lymphoma, multiple myeloma)
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Nephrotic syndrome (protein loss through urine)
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Severe malnutrition or malabsorption (celiac, IBD)
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Chronic infections or immune exhaustion
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Protein-losing gastrointestinal disorders
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Recent major illness, surgery, or acute stress
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Lab variation—especially if IgG is only slightly below reference
Symptoms that may accompany low IgG
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Frequent sinus, lung, ear, or GI infections
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Slow recovery from infections
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Chronic fatigue
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Poor vaccine response
What to do next
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Repeat testing with a serum quantitative IgG + IgG subclasses
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Consider CBC, CMP, SPEP, urinalysis for protein loss
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Review medications and medical history
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Ask for an immunology referral if IgG is persistently low or infections are recurrent
Low IgG on this panel alone does not confirm immune deficiency, but it may be a useful signal to investigate further.
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