A vascular access detection device and method for ensuring the proper insertion of a needle into a target is disclosed. A light source generates a beam of light which is directed along the needles longitudinal axis so that said beam of light passes though the hollow shaft of the needle. The needle may be guided to a target inside a patients body. Reflection and scattering of light by portions of the patients body may be monitored to assist in determining when the target inside of the patients body has been pierced by the needle.
