Red cell morphology in alcoholics: a new test for alcohol abuse.

Scanning electron microscopy has shown that the blood of alcoholics contains a large number of morphologically abnormal red cells. In two groups of alcoholics, the number of morphologically abnormal red cells ranged from 23.1% to 89.3% and 27.4% to 57.3% of total red cells compared to values in healthy controls of 4.5%-12.6% and 27.7%-79.5% in nonalcoholic liver disease patients. A characteristic finding was the presence of triangulocytes: these ranged from 1.2% to 18.0% of total red cells in the alcoholics as compared to 0-0.5% in healthy controls, and 0-1.3% in patients with nonalcoholic liver disease. The presence of elevated numbers of triangulocytes in blood appears to be specific to alcohol abuse. It is not, for example, elevated in nonalcoholic liver disease. No correlation was found between the number of triangulocytes or the number of morphologically abnormal red cells in blood and either the duration of alcohol abuse or the amount of alcohol consumed. Both parameters tended, however, to return to normal values during withdrawal. The mechanism by which alcohol abuse causes the morphologic abnormalities is not known. Preliminary in vitro experiments indicate that it is unlikely to arise as an effect of alcohol on circulating red cells. Based on the data presented, the measurement of the number of triangulocytes in a blood sample, although slow and laborious, may provide a highly specific test for alcohol abuse.