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Step 1
Antigens from patients sample are bound to inside of a well in a well plate
Step 2
A detection antibody complementary to antigen is added
Step 3
If antigen is present it will be immobilised on inside surface and antibody will bind to it
Step 4
The well is washed to remove any unbound antibodies and substrate solution is added
Step 5
If detection antibody is present there is a colour change- positive