The Mass General Hospital Blood Draw Lab - Revere is open to Mass General Brigham patients with an open laboratory order from their Mass General Brigham provider. Laboratory appointments are required for blood draws. Please call to schedule an appointment or schedule through Patient Gateway. The blood draw lab is open Monday through Thursday from 8:30am to 7:30pm and Friday from 8:30am to 4:15pm. The blood draw lab is closed on holidays.