Biological exposure tests used for a long time in persons working in the risk of lead cannot inform us accurately about a toxicological load of the organism a few months before. At this moment, it is relevant to undertake the toxicological examination of hair, nails, beard or body hairs. This toxicological examination is not suitable as a commercial one, it is necessary to combine it with other laboratory tests and clinical examination of a patient.

        Key words: lead, biological exposure test, examination of lead in hair