Medically reviewed by Anita C. Chandrasekaran, MD An ANA blood test (antinuclear antibody test) is usually performed on a blood sample as part of the diagnostic process for certain autoimmune ...

But when the test is positive, and you also have several other signs of lupus that doctors look for, it’s a strong signal for your doctor to consider lupus. 97% of people with lupus will test positive ...

Serum protein electrophoresis (SPEP) is a laboratory technique that’s used to determine the level of some types of proteins in a blood sample. Learn more about why your doctor may recommend it.

The challenge of this serum testing is the heterogeneity of free light chains and other methodical issues of testing which challenge in particular FLC tests based on turbidimetry and nephelometry. The ...