IgG (Immunoglobulin G) is the most abundant antibody in human blood, making up about 75% of all circulating antibodies. It is the primary antibody of the secondary immune response — produced after initial exposure to a foreign substance (antigen) and responsible for long-term immune memory.

In the context of food and environmental testing:

IgG antibodies represent a delayed immune response: symptoms can appear hours to days after exposure, making the trigger difficult to identify without testing. Unlike IgE (which causes immediate allergic reactions like hives or anaphylaxis), IgG reactions are low-grade and chronic — bloating, fatigue, brain fog, joint pain, skin issues

Standard allergy tests (skin prick, IgE blood tests) measure immediate hypersensitivity reactions. This panel measures IgG — delayed immune pathways that cause chronic, low-grade symptoms like fatigue, congestion, and brain fog that standard tests miss entirely.

Results are classified from 0 (Very Low) to IV (Very High). Class 0 means antibody levels are within normal range. Classes I–IV indicate increasing levels of immune reactivity, with Class III–IV suggesting significant sensitivity requiring environmental modifications.

Mold exposure is one of the most under-diagnosed environmental triggers. Aspergillus, Penicillium, Alternaria, and Cladosporium are common indoor molds that can cause chronic respiratory symptoms, fatigue, and cognitive issues — especially in damp environments.

Results are typically available within 5–7 business days after your sample is received at US BioTek Laboratories' CLIA-certified, COLA-accredited lab (CLIA #50D0965661) in Shoreline, WA.

Yes — we offer food sensitivity panels (FIT 132, FIT 176) alongside this inhalant panel. Many patients benefit from testing both to get a complete picture of immune triggers from both diet and environment.

No. Our clinic handles the ordering process. A licensed provider reviews your intake and authorizes the test. No separate doctor visit or prescription is needed.