Abstract: A vented syringe adapter assembly which includes a housing having a sidewall, bottom wall, and top wall, which walls combine to define a chamber within the housing. A dual lumen tubular conduit extends through the top wall, chamber and bottom wall with one end extending from the top wall and defining a syringe connector port and the opposite end extending from the bottom wall and defining a piercing tip. A first lumen extends through the tubular conduit from the syringe port to the piercing tip. A second lumen extends from the piercing tip to the inner chamber. An opening is provided on at least one of the walls of the housing and the opening is covered by a filter for allowing the passage of gases but preventing the flow of liquids through the opening.