Medical surveillance or health surveillance is an important component of occupational health and safety legislation in many countries. Students engaged in an undergraduate thesis for one semester could come into contact with solvents in numerous distillation experiments. Good laboratory practice is required to minimize student exposure to solvents. Medical surveillance is through blood tests for solvents, before and after the laboratory period. Students estimate their hourly exposure and become aware of the exposure hazard. This can have beneficial effects in a flow-on effect when students begin chemical engineering design.