Immunoelectrophoresis

Immunoelectrophoresis describes any technique where proteins can be separated and identified using a combination of antibodies and fluids that are affected by an electrical field. 
In practice, a sample is placed in one corner of a square plate containing an acidic gel and the gel is electrified in one director. In some cases, the gel plate is rotated 90 degrees and exposed to another electric field to further separate the sample. 
Because of the difficulty in performing the technique and the expense of the monoclonal antibodies used, it is used only in special cases and is not performed as part of any routine medical test. However, it can be used by immunologists to get insight into specific disease processes.For the most part, it is used in scientific research.
Immunoelectrophoresis at Wikipedia