# The Control of Lead at Work Regulations 1998, Paragraph 2


Biological monitoring shall be carried out at intervals not exceeding those set out below—
(a) in respect of an employee other than a young person or a woman of reproductive capacity, at least every 6 months, but where the results of the measurements for individuals or for groups of workers have shown on the previous two consecutive occasions on which monitoring was carried out a lead in air exposure greater than 0.075 mg/m3 but less than 0.100 mg/m3 and where the blood-lead concentration of any individual employee is less than 30 μg/dl, the frequency of monitoring may be reduced to once a year;
(b) in respect of any young person or a woman of reproductive capacity, at such intervals as the relevant doctor shall specify, being not greater than 3 months.

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Source: https://www.legislation.gov.uk/uksi/1998/543/schedule/2/paragraph/2 (the official version)
Page: https://openlegislation.uk/control-of-lead-at-work-regulations-1998/schedule-2/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.