Home/Analyses/Biochemical tests/M-Gradient, Screening. Serum Protein Electrophoresis (SPEP), Immunofixation with Polyvalent Antiserum, Quantification of M-Protein (without Typing)Back to analyses4050M-Gradient, Screening. Serum Protein Electrophoresis (SPEP), Immunofixation with Polyvalent Antiserum, Quantification of M-Protein (without Typing)