Chlamydia is one of the bacterial transmitted diseases that may be caused by Chlamydia trachomatis. Not only the Chlamydia trachomatis, but two other species of the Chlamydia can lead to problems like C. psittaci, C. pneumonia. When a person is suffering from the symptoms of the Chlamydia disease, the blood test is done to know the reason and also to differentiate between the different spices if more than one present in the blood. In the test, the IgM antibodies against the Chlamydia are detected. Based on the panel test (for differentiation) the doctor will suggest further treatment.