“…In most, but not all, studies the content of serotonin or its metabolite, 5-hydroxyindoleacetic acid (5-HIAA), is decreased in the brainstem of suicide victims (Shaw et al, 1967;Bourne et al, 1968;Pare et al, 1969;Lloyd et al, 1974;Beskow et al, 1976;Cochran et al, 1976;Korpi et al, 1986). Suicidal behavior is associated with lower levels of 5-HIAA in the CSF, and there is evidence that suicide risk can be predicted by low 5-HIAA in CSF after a suicide attempt (Nordstrom and Asberg, 1992).…”