Does Lupus Affect All Parts Of The Body? The Feet, Knee, And Hands. Swelling In All The Joints, And Unbearable Pain. Now Pain Is In The Back. A Bone Marrow Test , Would This Diagnosis Lupus?

Lupus is an Autoimmune disease and it can affect any part of the body. However, it normally affects heart, joints, blood vessels, liver, kidneys, skin, and nervous system. There are a number of tests that are conducted for diagnosis of Lupus. These include:
- Antinuclear Antibody testing
- Anti-extractable nuclear antigen testing
- Complement system level tests
- Electrolytes and renal function testing
- Liver enzyme testing and in some cases
- Lupus erythematosus cell test

for details see the link below:
en.wikipedia.org
- Complete blood count.