DefinitionUrine immunoelectrophoresis is a test that measures immunoglobulins in a urine sample.Immunoglobulins are proteins that function as antibodies. There are various types of these proteins. Some can be abnormal.See also: Immunoelectrophoresis - serumAlternative NamesImmunoglobulin electrophoresis - urine; Gamma globulin electrophoresis - urine; Urine immunoglobulin electrophoresis; IEP - urineHow the test is performedCollect a "clean-catch" (midstream) urine sample. To obtain a clean-catch sample, men or boys should wipe clean the head of the penis. Women or girls need to wash the area between the labia (lips of the vagina) with soapy water and rinse well.As you start to urinate, allow a small amount to fall into the toilet bowl. This clears the urethra -- the tube that carries urin