
Although we think schizophrenia is a neurodevelopmental brain disorder that may involve chemical imbalances and possibly structural differences in the brain, we can't test for it at present. Researchers are exploring use of the human genome (map of genes both at the individual and larger group level), neuroimaging (highly detailed pictures of the brain), and electrophysiology (study of the brain's activity), to try to find indicators of illness. They are learning a great deal, but to date no markers that could be used as a test have emerged. (Source: OASIS Early Psychosis Toolkit)