Erythrocyturia, smoking, and occupation.

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Abstract
In a population of 432 apparently healthy men aged 50 yr and over 19.2% had 1 or more erythrocytes per high power field in the urine while 8.1% had 10. Erythrocyturia seemed to be strongly correlated with tobacco consumption. No significant association with occupation could be demonstrated but the data were insufficient to refute the possibility of such an association. Raised levels of o-aminophenols as a result of abnormal tryptophan metabolism induced by smoking might cause microhematuria in smokers. As these metabolites are carcinogens microhematuria might be a valuable early sign of cancer of the urinary bladder.