Diagnosis is the process of determining which disease or condition explains by persons symptoms and signs of suffering. They are so many diseases caused by microorganisms such as bacteria, virus, fungi and parasites. Diagnosis based on different laboratory tests that can identify which type of microorganism present and what treatment should be continued to the patient. Generally laboratory test uses a sample of blood, urine, sputum or other fluid or tissue in the body. After finding which microorganism, doctors then do tests to determine which drugs are most effective against it and after that effective treatment can be started sooner.