Changes

===Applications===  

===Applications===  

[[Image:Coombs test schematic.png|thumb|right|100px|Coombs test- copyright A Rad 2006]]

[[Image:Coombs test schematic.png|thumb|right|100px|Coombs test. A Rad, '''WikiMedia Commons''' 2006]]

*'''Widal test''': used to test for antibodies to certain bacteria in patient serum, e.g. salmonella

*'''Widal test''': used to test for antibodies to certain bacteria in patient serum, e.g. salmonella

*'''Blood typing''': also known as '''haemagglutination''', the reaction can be used to determine blood type, i.e. an anti-A serum will agglutinate with type A red blood cells but not with B or O.  

*'''Blood typing''': also known as '''haemagglutination''', the reaction can be used to determine blood type, i.e. an anti-A serum will agglutinate with type A red blood cells but not with B or O.