March 12, 2012, 2:56 pm

By PERRI KLASS, M.D.

Twenty-eight years ago, I wrote about drawing blood for the first time, about the pain of the patient and the self-doubt of the medical student. In my first clinical experience, I was learning a strange new color code: red-top tube for blood chemistries, purple top for hematology, green top, yellow top, and so on. Click HERE to read more at the New York Times