**Note: All laboratory testing requires an authorizing physician. DHA Laboratory offers a patient direct program that partners you with an authorizing physician. If you have any additional questions regarding the availability of testing, please contact our laboratory by telephone or email.**
IgG is the major antibody found in serum. IgGs are composed of two fragment antigen binding (Fab) regions that contain the antigen binding sites and the Fc region, which is responsible for most of the biologic activity of the antibodies (Figure 1). An antigen is a substance that causes the immune system to produce an antibody that specifically reacts with it. IgG-mediated reactions to food antigens may be delayed by several hours or days, whereas IgE food antibody reactions are quite immediate.
Human IgG is separated into four subclasses denoted IgG1, IgG2, IgG3, and IgG4. Each subclass varies in abundance and biological function. IgG1 and IgG3 are predominantly responsible for antibody protection against reinfection. IgG2 antibodies are opsonic (marking a pathogen for ingestion and destruction) and develop in response to carbohydrate polysaccharide antigens. IgG4 molecules function as skin-sensitizing immunoglobulins and are thought to block antibodies produced in response to chronic exposure to antigens.
Immunoglobulin G (IgG) food testing is a useful guide for structuring elimination diets for patients with many chronic conditions. Individuals with neurological, gastrointestinal, movement, and behavioral disorders often suffer from IgG food sensitivities. People may continue to eat offending foods unaware of their potential adverse effects. Symptoms associated with food sensitivities may occur hours or days after the offending food was eaten because IgG food antibodies remain for a much longer time than IgE antibodies. IgE food allergy causes the release of histamine, producing an immediate hypersensitivity reaction. In contrast, IgG food sensitivity is triggered by the binding of compliment to IgG food antigen complexes, causing an inflammatory response. This is a delayed hypersensitivity reaction in which symptoms appear anywhere from hours to days after eating the offending food. Elimination of IgG-positive foods may improve symptoms of irritable bowel syndrome, autism, AD(H)D, cystic fibrosis, rheumatoid arthritis, and epilepsy, according to numerous clinical studies.
IgG testing determines if food reactions are contributing to physical or mental symptoms, and much more quickly than eliminating and then reintroducing each suspect food one-by-one over a period of time.
Removal of highly reactive foods from the diet is a non-invasive therapy that often mitigates a patient’s symptoms.
Research and clinical studies suggest food allergies identified by IgG testing can be major contributing factors to many chronic health conditions.
Eliminating all identified IgG-positive foods after testing can reduce stress on the immune system, decrease inflammation (helping to heal “leaky gut”), resolve food cravings, and reduce the potential for eating disorders.
The bead-based immunofluorescent assay uses color-coded magnetic beads, which are covalently coupled to 190 different food proteins specific to each protein’s IgG target. The color-coding of the beads into spectrally distinct sets allows the simultaneous capture and detection of multiple food IgG analytes from a single reaction well.
The xMAP® bead-based immunoassay occurs on the surface of magnetic beads by adding a patient’s serum sample and observing the classic antigen /antibody interaction, detected by using a fluorescent labeled antibody. Laser-based analysis of the fluorescent signal response is proportional to the binding of food-specific IgG antibodies onto the beads.
Beta-Lactoglobulin
Casein
Cheddar Cheese
Cow’s Milk
Goat’s Milk
Mozzarella Cheese
Sheep’s Yogurt
Whey
Yogurt
Adzuki Bean
Black Bean
Garbanzo Bean
Green Bean
Green Pea
Kidney Bean
Lentil
Lima Bean
Mung Bean
Navy Bean
Pinto Bean
Soybean
Tofu
Acai Berry
Apple
Apricot
Banana
Blueberry
Cantaloupe
Cherry
Coconut
Cranberry
Date
Grape
Grapefruit
Guava
Jackfruit
Kiwi
Lemon
Lychee
Mango
Orange
Papaya
Passion Fruit
Peach
Pear
Pineapple
Plum
Pomegranate
Raspberry
Strawberry
Watermelon
Amaranth
Barley
Buckwheat
Corn
Gliadin
Malt
Millet
Oat
Quinoa
Rice
Rye
Sorghum
Teff
Wheat Gluten
Whole Wheat
Abalone
Anchovy
Bass
Bonito
Codfish
Crab
Halibut
Lobster
Mackerel Saba
Octopus
Oyster
Pacific Mackerel (Saba)
Pacific Saury
Perch
Red Snapper
Salmon
Sardine
Scallop
Shrimp
Small Clam
Squid
Tilapia
Trout
Tuna
Beef
Chicken
Duck
Egg White
Egg Yolk
Goose
Lamb
Pork
Turkey
Almond
Brazil Nut
Cashew
Chestnut
Chia Seed
Flax Seed
Hazelnut
Hemp Seed
Macadamia Nut
Peanut
Pecan
Pine Nut
Pistachio
Pumpkin Seed
Sesame Seed
Sunflower Seed
Walnut
Artichoke
Asparagus
Avocado
Bamboo Shoot
Bean Sprout
Beet
Bell Pepper
Bitter Gourd
Broccoli
Brussel Sprout
Burdock Root
Cabbage
Carrot
Cauliflower
Celery
Chili Pepper
Cucumber
Eggplant
Enoki Mushroom
Garlic
Kale
Leek
Lettuce
Lotus Root
Napa Cabbage
Olive (Green)
Onion
Portabella Mushroom
Potato
Pumpkin
Radish
Seaweed Kombu Kelp
Seaweed Nori
Seaweed Wakame
Shitake Mushroom
Spinach
Sweet Potato
Tomato
Yam
Yellow Squash
Yuca
Zucchini
Basil
Bay Leaf
Black Pepper
Cayenne Pepper
Cilantro
Cinnamon
Cloves
Cumin
Curry
Dill
Ginger
Hops
Mint
Miso
Mustard Seed
Oregano
Paprika
Rosemary
Sage
Tarragon
Thyme
Turmeric
Vanilla Bean
Bromelain
Cane Sugar
Cocoa Bean
Coffee
Green Tea
Honey
Meat glue
Oolong Tea
Performing Laboratory is Mosaic Diagnostics.