Patent ID: 8345249

Claim:
A liquid sample analyzing method using a test piece, the test piece comprising an extended layer on which a liquid sample is extended, the extended layer comprising: overflow blocking lines for preventing the liquid sample from flowing to an outside from a passage region of the extended layer; and a colored portion that is provided on a part of the passage region of the extended layer and contains an immobilized reagent, the analyzing method comprising: extending the liquid sample added to the test piece, in the passage region of the extended layer; and analyzing a target analyte in the liquid sample by optically detecting coloring of the colored portion, wherein in a state in which the liquid sample is not extended in the passage region of the extended layer, the analyzing method further comprises: optically measuring the test piece so as to cross the passage region of the extended layer and the overflow blocking lines; and deciding a passage width of the extended layer based on measurement data.