A syringe assembly for fluid collection includes a housing having a sidewall defining a hollow bore therein, and an elongate plunger with the distal end of the plunger forming a chamber within the hollow bore for containing a fluid therein. The plunger is adapted for slideable movement within the hollow bore between an initial position and a retracted position. The assembly includes a hub disposed at least partially within the hollow bore and at least partially supporting a cannula therewith. The hub is adapted to automatically transition from an initial position in which at least a portion of the cannula is disposed external to the housing, to a retracted position in which the cannula is fully shielded by the housing, upon transition of the elongate plunger from the initial position to the retracted position.