[Results of the control of the reliability of toxicological analyses of biological specimens 1980-1984].

Within the programme of the National Specialist Group relating to Industrial Medicine the Department of Laboratory Diagnostics, Institute of Occupational Medicine in Lódź, carries on biological material reliability control. This paper has been aimed at an evaluation of the work carried on by laboratories basing on the results of determinations of control samples of lead, mercury, phenol, trichloroacetic acid and deltaminolevulinic acid.