[Thymol test, concentration of total protein and bilirubin and activity of various serum enzymes in a population exposed to diphenylformamide].

445 workers occupationally exposed to subtoxic diphenylformamide concentration were examined. No significant differences were found in results of thymol test, concentration of total protein, bilirubin, and activity of basic phosphatase in blood serum, compared with the control group. A higher activity of asparagine--and--alanine aminotransferas and gamma--glutamylotranspeptidase was found; it was, however, statistically insignificant.