Protein electrophoresis is a test that measures specific proteins in the blood. The test

separates proteins in the blood based on their electrical charge. The protein electrophoresis

test is often used to find abnormal substances called M proteins. The presence of M proteins

can be a sign of a type of cancer called myeloma, or multiple myeloma. Myeloma affects

white blood cells called plasma cells in the bone marrow. Protein electrophoresis also tests

for other proteins and antibodies (immunoglobulins). The protein electrophoresis test is also

used to diagnose other conditions affecting the plasma cells. These include Waldenström

macroglobulinemia, monoclonal gammopathy of undetermined significance (MGUS), and

primary amyloidosis.