Attenuated psychosis syndrome (APS) is a proposed [1] mental disorder diagnosis characterized by presence of symptoms of psychosis without passing the threshold for a psychotic disorder. [2] In APS, reality testing is "relatively intact", and the severity of symptoms is lower than in psychotic disorders. [2]
The proposed diagnosis was included in Section III (Emerging measures and models) in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), in the chapter titled "Conditions for Further Study". [2] [3] Conditions outlined here are, according to the DSM-5, "not intended for clinical use; only the criteria sets and disorders in Section II of DSM-5 are officially recognized and can be used for clinical purposes". [2] In addition to this, APS is mentioned as an example of a presentation which can be diagnosed as Other Specified Schizophrenia Spectrum and Other Psychotic Disorder, which is an official Section II diagnosis. [4]