The occupational health nurse is biomonitoring workers for exposure to chemicals in the workplace. When should the nurse obtain blood and urine samples?
A) At the beginning of the work shift
B) In the middle of the work shift
C) At the end of the work shift
D) During the pre-employment physical
C) At the end of the work shift
Explanation: A) Workers have not been exposed to a chemical at the beginning of a shift, and therefore, biomonitoring may not show any results.
B) The biomonitoring of workers should take place when workers have been exposed to hazards for 8 or more hours.
C) For biomonitoring of workers, venous blood, urine samples, or other specimens (depending on the chemical or metabolites measured) should be taken at the end of a work shift after workers have been exposed for 8 or more hours to obtain the best results of exposure.
D) Unless the individual has been exposed to chemicals at a recent, former job, this would not be necessary for a pre-employment physical.
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