Parent Number

Definition: identical to ORC-8-parent. This field relates a child to its parent when a parent-child relationship exists. For example, observations that are spawned by previous observations, e.g., antibiotic susceptibilities spawned by blood cultures, need to record the parent (blood culture) filler order number here. The parent-child mechanism is described under the order control field notes (see Segment ORC field notes in section 4.3.1.2.1). It is required when the order is a child.