A phlebotomy needle is disclosed which includes structure to facilitate visualization of flashback. In one embodiment, a central portion of the needle includes a hole or opening which communicates with a flow channel defined by the needle and a transparent housing is positioned about the opening to facilitate visualization of blood flow through the needle. A material which allows passage of air and provides an indication of blood flow through the needle is positioned over the opening. In one embodiment, the material is in the form of a plug or, alternately, in the form of a patch or collar. The material can be encased in or provide a window in the transparent housing. In another embodiment, the phlebotomy needle includes a needle and a housing having a passive vent and a viewing region for visualizing blood flow in the housing.