Question: DARKHAT032, I am taking a blood test, do you have infor on that? 

Answer: On a blood test, nurses take a sample of your blood, usually from the arm, and send it to a lab to be processed.  It depends on what the sample is for, as to how they process it.  They may look for drugs, diseases (HIV for example), or other health related problems, such as low oxygen saturation or iron defficiency.
This question from the Yahoo Q&A forum is categorized in the topic: Health