Immunodiagnostics are a group of clinical diagnostics which uses diagnostic techniques that make use of the immune system of the body. It plays a major role in understanding about various diseases in humans. These tests come in different types as they can be performed on serum. The techniques are easy to perform and decipher the diseased state of a person. New immunoassay formats and diagnostics are being introduced daily. Microfluidics is another prominent advancement in immunodiagnostics and have led to the discovery of microfluidic chips and rapid immunoassays.