What is the ruling on a woman working as a chemist in a laboratory, and is it permissible for her to take samples from men in the absence of a doctor?

It is permissible for a woman to work in a laboratory if the work is permissible and does not involve anything that violates the Sharia or exposes her to temptation, provided that there is no private seclusion with non-mahram men or suspicious mixing. As for taking samples from men, it is permissible when there is no man available to do so.