[Study of the relationship between pulmonary changes and blood plasma composition under the effect of industrial dust. III. Usefulness of the results of the studies for diagnostic purposes].

The paper presents results of statistic calculations enabling to define the diagnostic usefulness of results of determining free aminoacids in blood plasma for evaluation of workers' exposure to grinding and ceramic dusts and welding fume. Determination of proline in the blood plasma of ceramic industry workers and electric welders and determination of hydroxyproline in welders' blood plasma were found to be a particularly significant and early index of exposure to ceramic dust or welding fume.