Abstract: A shield device and related methods of use for conducting a patient procedure, such as a dental procedure, when the patient is positioned in or on a chair or table. The shield device includes a support arm and a shield. The shield is mounted to the support arm and movable between an active position vertically above a portion of the patient when the patient is lying in the chair or table, and an inactive position removed from patient. The shield has a transparent portion through which a user can view the patient when the shield is in the active position. The shield includes a ventilation system to remove air from a space defined between the patient and the shield when the shield is in the active position.