Anti fk778antibodies and high sensitive immunoassay methods

A highly-sensitive immunoassay method for the FK778 substance, which comprises immobilizing an antibody capable of binding to the FK778 substance, allowing the FK778 substance contained in a sample and the FK778 substance labeled by detectable substance to react competitively with said immobilized antibody and detecting said labeled substance bound to said immobilized antibody.

A highly-sensitive immunoassay method for the FK778 substance, which comprises using a first antibody capable of binding to the FK778 substance and an immobilized second antibody capable of binding to said first antibody, allowing the FK778 substance contained in a sample and the FK778 substance labeled by a detectable substance to react competitively with said first antibody and detecting said labeled FK778 substance bound to said first antibody bound in turn to said second antibody.

A highly-sensitive immunoassay method for the FK778 substance, which comprises using a first antibody labeled by a first detectable substance, which is capable of binding to the FK778 substance, the FK778 substance labeled by a second detectable substance, and an immobilized second antibody capable of binding to said second detectable substance, allowing said FK778 substance contained in a sample and the FK778 substance labeled by said second detectable substance to react competitively with said first antibody and detecting said first antibody bound to said labeled FK778 substance whose said second detecting substance is bound to said second antibody.

A test kit for assaying the amount of the FK778 in a sample, comprising an antibody capable of binding to the FK778 substance and the FK778 substance labeled by detectable substance.