Are personal sampling measurements always done in the presence of industrial hygienist?

I am doing a research thesis on exposure assessment methods. I am not too familiar with personal sampling. I would like to know if personal sampling measurement in the workplace are usually done in the presence of industrial hygienist.

Thank you.
Occupational Asthma, Health Professional, 2/17/2014, 2/17/2014,

Personal sampling is usually done by an industrial hygienist, who needs to set up the monitor, calibrate any suction pump and analyse the sample afterwards. The hygienist does not need to be present throughout the sampling. Biological monitoring is an alternative method of exposure assessment for some agents (eg isocyanates and metals). Tests can be done post-shift on blood or urine without a hygienist. Some biological monitoring can be done on exhaled breath when a physiologist might be the most appropriate professional to supervise the sampling

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