Method and kit for quantifying liver-type fatty acid binding protein, method and kit for testing for kidney diseases, and companion diagnostic drug

A method for testing a kidney disease based on an amount of oxidized L-type fatty acid binding protein in a subject or a parameter value which correlates therewith, the method comprising:

• comparing a known normal range of an amount of the oxidized L-type fatty acid binding protein or a parameter value which correlates therewith, or a known range of an amount of the oxidized L-type fatty acid binding protein in a kidney disease or a parameter value which correlates therewith, and
• an amount of the oxidized L-type fatty acid binding protein in urine of a subject or a parameter value which correlates therewith;
• and
• determining in which range the amount in the subject or parameter value which correlates therewith is included.