Differential diagnose med brug af invasive endoskopiske metoder kan være indiceret for at undersøge eventuel tilstedeværelse af komplicerende tilstande som ulcus, autoimmun gastritis og maligne tilstande.
Various diagnostic tests, including invasive endoscopic tests, could be required to check for the presence of any other complications, such as gastric ulcer, infection of the gastric mucosa caused by an autoimmune reaction, and tumours.