Urinary 3-methoxy-4-hydroxyphenylglycol (MHPG) levels in 53 depressed women were compared to current suicidal thoughts or activity. Comparisons were also made between MHPG and past suicide attempts, number of past attempts, and seriousness of the worst attempt. There was a weak trend for current but not past suicidality to be associated with decreased MHPG levels.