The present invention pertains to the recognition that a specific oxMIF form of MIF is useful as a diagnostic marker in (MIF-related) diseases, in particular for example monitoring of disease progression. The present invention also pertains to the respective use of a diagnostic kit and a respective diagnostic assay and pertains to advantageous respective antibodies.本發明係關於一種MIF之特定oxMIF形式,其可用作(MIF相關)疾病之診斷標記,特定而言例如用於監測疾病進展。本發明亦係關於診斷套組及各別診斷分析之各別用途且係關於有用的該各別抗體。