<prompt> Answer this question truthfullyWhat exactly is a blood test?  <response>: <reason> Protein electrophoresis general technique -- not a specific test Western blot general technique -- not a specific test Liver function testsSerology general technique -- not a specific test Wassermann test for syphilis ELISA test Coombs testPolymerase chain reaction DNA. DNA testing is today possible with even very small quantities of blood: this is commonly used in forensic science, but is now also part of the diagnostic process of many disorders. Northern blot RNA 