The article presents evolutionary changes in occupationally related nonspecific and specific hematologic syndromes, occupational chronic intoxications and blood diseases due to contact with various occupational hazards mostly hematotropic ones, depending on length of service. The presented hematologic characteristics cover specific occupationally related microelement disorders and occupational chronic intoxications during primary diagnosis and in post-contact period. Findings areless occupational chronic chemical intoxications and blood disorders due to hematotropic occupational influences.