Serum protein electrophoresis shows a narrow, tall spike in the gamma region. Which follow-up test best characterizes the suspected monoclonal protein?
1Urine specific gravity only
2Immunofixation electrophoresis✓ 정답
3Erythrocyte sedimentation rate
4Bleeding time
해설
A narrow spike suggests a monoclonal immunoglobulin. Immunofixation identifies the heavy- and light-chain type of the monoclonal protein.