Commonly, immunoglobulin disorders are classed as:Immunoglobulin ExcessPolyclonal - This is an Ig excess in some or all immunoglobulin classes that come from several immune cells.Monoclonal - This is the excess immunoglobulins that arrive from the clones of only one plasma cell.The Deficiency of ImmunoglobulinSecondary or Acquired - A highly common deficiency of Ig is caused by some underlying condition.Primary or Inherited - The primary deficiency of immunoglobulin is caused by some rare disorders where the body fails to create one or more than one class of immunoglobulin.This test is ordered with others, like a urine protein electrophoresis, for diagnosing or monitoring some conditions that are linked with excessive or abnormal immunoglobulin production. If this turns into the case, then a urine sample is collected besides blood.