A glassy carbon electrode modified with ferrocene carboxylic acid(FCA) immobilized in the cavity of β-cyclodextrin polymer(β-CDP),meanwhile fresh albumen,a kind of convenient,facile and cheap(material),used as crosslinking agent was prepared.

Objective To explore a practical way for traceability and comparability of the value obtained from clinical biochemical examination in regional medical organizations by transferring the assigned value in fresh serum to daily serum calibrator.