FIELD: medicine.
SUBSTANCE: after antigen-antibody complex is prepared in a reaction compartment wherein said antigen to be modified and antibody are bound, said reaction compartment is washed with using a sample solution. The invention allows detecting a signal reflecting quantity of said antigen to be modified at precision comparable when using a washing solution to this without using said solution. Herewith, the washing solution is not required to be supplied from the outside of a chip or to be ensured therein beforehand.
EFFECT: immunoassay is easily realised on the chip.
6 cl, 6 dwg, 1 tbl, 2 ex
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