Measurement method for unbound bilirubin in blood sample
2016
Provided is a measurement method whereby the amount of unbound bilirubin (UB) can be exactly reflected whether a specimen contains a large amount of conjugated bilirubin or not. The measurement method for UB according to the present invention comprises decomposition step (i), decomposition stopping step (ii), contact step (iii) and detection step (iv). In decomposition step (i), a blood sample containing unconjugated bilirubin (iD-Bil) and conjugated bilirubin (D-Bil) is subjected to an oxidative decomposition reaction of UB in iD-Bil and D-Bil. In decomposition stopping step (ii), the oxidative decomposition reaction is stopped to give a decomposition product of the sample. In contact step (iii), the decomposition product of the sample is contacted with UnaG that is capable of specifically binding to iD-Bil. Separately, an unreacted sample, which is the blood sample not subjected to decomposition step (i), is contacted with UnaG too. In detection step (iv), the fluorescence of UnaG is detected from the decomposition product of the sample and from the unreacted sample. Then, the amount of UB is derived from the difference between the detected values.
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