human
I'm a little confused about the different types of blood tests that are available. Which ones are most useful?
assistant
The most useful type of blood test is one that can detect antibodies or antigens in the bloodstream that indicate an infection, autoimmune disease, or other health issue. These include tests for Lyme Disease, Epstein-Barr virus, and rheumatoid arthritis. Other blood tests may be used to check levels of certain hormones or chemicals, assess nutritional deficiencies, or measure the effectiveness of treatments.