Abstract: A door assembly for an instrument cabinet includes a door element having a first side edge and a second side edge opposite the first side edge adapted for installation in a predetermined orientation, at least two first withdrawable pins in a region of the first side edge and at least two second pins which form a pivot axis in a region of the second side edge, wherein, in an extended condition, the first pins are in communication with a first depression in the instrument cabinet to prevent the door element pivoting about the pivot axis and, in a withdrawn condition, extend out of the first depression to permit the door element to pivot about the pivot axis, at least one handle element having a fixed part that secures to a front side of the door element and a movable part that mechanically couples to the two first pins, wherein actuation of the movable part allows the first pins which are coupled thereto, to move into a retracted condition, wherein the door element and/or the handle element are of symmetrical c