There is growing evidence that low levels of circulating Vitamin D may contribute to the development of a wide range of chronic diseases. This test is unsuitable for under 18 year olds.
Helicobacter pylori(H.pylori) causes gastric ulcers. It is a cork-screw shaped bacteria that lives in the mucus coating the lining of the stomach and duodenum.
A parasite is an organism which exploits any other live animal for nutrition. In most cases, the parasitic process causes harm to the host through the actual removal of the nutrients, or by carrying other diseases into the body.