A dream that you are in a laboratory can mean that you need to look at things in a practical, objective way. You may have been letting your emotions or your past experiences color your perceptions of things, and this could be making you behave unfairly.
On the other hand, working in a laboratory in a dream can be a message that you are being too clinical and unemotional. You need to think with your heart as well as with your head.
A dream that you are a scientist in a laboratory can mean that you need to view things in more detail or that you need to take a more methodical approach toward solving a problems.
If you dream that you are a specimen in a laboratory, you may feel that others are judging you or taking advantage of you.