Initially, an assessment of the individual’s medical history followed by a thorough physical examination is performed in order to identify the cause of the symptoms. After dysbiosis is identified as a potential cause, a series of tests will be required to confirm the diagnosis. A blood test called complete blood count (CBC) can provide information concerning the overall health of the individual and can reveal signs of inflammation or disturbances in coagulation. Additionally, a complete metabolic panel (i.e., a series of blood tests used to evaluate the function of critical organs, such as the liver and kidneys) as well as an evaluation of vitamin levels (e.g., B-complex vitamins, vitamin D) can help determine the severity of the dysbiosis. Blood tests can also reveal conditions associated with dysbiosis, like type 2 diabetes (e.g., elevated glucose and hemoglobin A1C levels). In order to confirm the diagnosis, more specific tests will be required. A hydrogen breath test is a diagnostic tool for small intestine bacterial overgrowth. After drinking a solution with high levels of glucose or lactose, also known as an oral glucose tolerance test, individuals will be asked to breathe into a plastic bag. The breath sample taken will be analyzed for its hydrogen or methane content to determine if there is bacterial overgrowth. Alternatively, the organic acid test is a urine test that can be performed to measure the amount of organic compounds produced by microorganisms in the body and, specifically, the intestinal microbiome. The Comprehensive Digestive Stool Analysis (CDSA) is an advanced stool test that provides immediate, precise clinical information on the overall health of the GI tract. Lastly, if areas of infection are suspected, biopsies can reveal the extent and the underlying cause of the disease. For instance, biopsies can confirm the diagnosis of Crohn disease or ulcerative colitis, which may be caused by dysbiosis.