Deamidated Gliadin Peptide (DGP) IgG is a key antibody used in the evaluation of gluten-related disorders, including celiac disease and non-celiac gluten sensitivity. When gluten is consumed, it is broken down into gliadin fragments. In susceptible individuals, these fragments are modified (deamidated), making them more likely to trigger an immune response. The presence of DGP IgG antibodies reflects this immune activation.
DGP IgG is especially important in individuals with selective IgA deficiency, a condition that is more common in people with celiac disease. In these cases, IgA-based tests (such as tTG IgA or DGP IgA) may appear falsely normal, making IgG-based markers essential for accurate detection.
What Does an Elevated DGP IgG Mean?
High levels of DGP IgG may indicate:
- Celiac disease
- Non-celiac gluten sensitivity
- Ongoing immune response to gluten
- Intestinal inflammation or barrier dysfunction
Elevated DGP IgG is often seen in individuals who continue to consume gluten and have an underlying sensitivity or autoimmune response. In celiac disease, this immune activity contributes to damage of the small intestinal lining, impairing nutrient absorption.
Symptoms Associated with Elevated Levels
Elevated DGP IgG may be associated with:
- Digestive symptoms (bloating, diarrhea, constipation)
- Fatigue or low energy
- Brain fog or difficulty concentrating
- Nutrient deficiencies (iron, B12, folate)
- Joint pain or inflammation
- Skin issues
Some individuals may have subtle or no symptoms, despite ongoing immune activation.
Important Testing Considerations
Accurate testing requires that you are consuming a gluten-containing diet. Eliminating gluten prior to testing can lead to false-negative results.
DGP IgG is often evaluated alongside:
- Tissue Transglutaminase (tTG) IgA and/or IgG
- DGP IgA
- Total IgA levels
This combination improves diagnostic accuracy and helps identify cases that might otherwise be missed.
What to Do If Your Levels Are High
If DGP IgG is elevated:
- Continue consuming gluten until evaluation is complete (unless instructed otherwise)
- Follow up with additional celiac-specific testing
- Consult with a healthcare provider for diagnosis and management
If celiac disease is confirmed, treatment involves a strict, lifelong gluten-free diet, which allows the intestinal lining to heal and reduces inflammation.
Why This Marker Matters
DGP IgG plays a critical role in detecting gluten-related disorders, particularly in patients where standard IgA testing may be unreliable. It helps uncover hidden or early immune responses to gluten and supports more accurate diagnosis.
Deamidated Gliadin Peptide (DGP) IgG
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