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 any underlying medical conditions that may be causing your symptoms. This could include checking for anemia, thyroid problems, or other hormone imbalances. Additionally, certain blood tests can help diagnose autoimmune diseases, such as rheumatoid arthritis and lupus, which can cause joint pain and fatigue.