How to prepare for Gluten Basis

Preparation for a 'Gluten Basis' test depends on the specific test type. If it is a genetic test (e.g., HLA-DQ2/DQ8), no dietary preparation is needed because genetics are fixed. If it is a serological test (tTG-IgA) for celiac disease, you must consume gluten-containing foods for at least 6–8 weeks prior to avoid false negatives. The provided context does not contain specific instructions for 'Gluten Basis'. Therefore, I recommend: for a DNA test, no diet change; for an antibody test, consult a physician and consider a gluten challenge. Evidence level: practice (clinical guidelines), not directly from the given sources. Safety note: Do not start a gluten-free diet before a definitive diagnosis, as it can mask test results.