An in vitro method for determining and/or monitoring an individual's health status by measuring the content of Klotho in saliva or tear fluid. A test kit to perform such an assay is an immunoassay test kit, especially adapted to perform a double antibody sandwich assay or a competitive assay.

The present invention relates to a method for diagnosing Polycystic Ovarian Syndrome (PCOS) in a subject, said method comprising the steps of a) determining the amount or concentration of total LTA4H in sample from the subject, b) determining the amount or concentration of METRNL in a sample from the subject, c) calculating a score of the amounts or concentration determined in steps a) and b), d) comparing the calculated score with a reference score, and e) diagnosing PCOS in a subject.

The present invention provides antibodies and fragments thereof that specifically detect the complex of a specific cognate antigen-binding moiety, in particular antibodies, and its antigen. The antibodies of the present disclosure do not bind either said cognate antigen binding moiety or said antigen alone and this can be used e.g. to directly detect antigen-bound antigen-binding moieties. Further disclosed are methods for production and use of said antibodies and antibody fragments.

The disclosure relates to methods and kits for detecting, quantifying, or both, phosphorylated tau (p-tau) in a biological sample. The disclosure further provides methods for detecting brain-associated tau polypeptide, a brain injury or a neurodegenerative disease in a subject, determining the eligibility of individuals for participation in clinical trials for brain injury and/or neurodegenerative disease treatments, distinguishing between individuals with brain injury and/or neurodegenerative disease and without brain injury and/or neurodegenerative disease, and monitoring response to treatment of the same.