Definition of impression for Students. 1  1 : something (as a design) made by pressing or stamping a surface The tires made impressions in the mud. 2  2 : the effect that something or someone has on a person's thoughts or feelings She shared her impressions of the city. 3  3 : an idea or belief that is usually uncertain.
A phlebotomist is someone who has been trained specifically in how to successfully draw blood, whether that be for a medical test or a blood donation. They work in such locations as doctors offices, medical labs, and hospitals. Most individuals who wish to pursue a career in phlebotomy will complete a training program before entering the workforce.
Charles Richard Drew (June 3, 1904 â April 1, 1950) was an American physician, surgeon, and medical researcher. He researched in the field of blood transfusions, developing improved techniques for blood storage, and applied his expert knowledge to developing large-scale blood banks early in World War II.