A system for detecting needle dislodgement includes a first sensor element, a second sensor element, and an alarm. The first sensor element attaches to an associated dialysis tubing having a needle connected at one end. The first sensor element also attaches to the associated dialysis tubing offset from the needle and a sterile field, which is an area on a leg or arm adjacent to where the needle is inserted, in a manner such that movement of the associated dialysis tubing results in movement of the first sensor element. The second sensor element secures to the arm or leg offset from the sterile field. The alarm is in communication with or includes at least one of the first sensor element and the second sensor element. The alarm generates a signal indicative of a position of the first sensor element with respect to the second sensor element.