Unlike with a traditional blood draw, the patient does not see the needle go into the arm nor the tubes of blood. The process takes about two minutes and has a 95% success rate on the first attempt.

Medically reviewed by Gagandeep Brar, MD The red cell distribution width (RDW) blood test measures differences in the volume ...

Several health systems across the U.S. — including Northwestern Medicine — are gearing up to try a new way of drawing blood: using a robot.