Now that you have defined a message definition and a message identity for Lab Results messages, the next step is to set up the segment grammar for the message definition.

To set up the segment grammar:

• In the Workspace, in the LabResults message definition, double-click Message Grammar. The Message Grammar window appears.
• Drag the PID segment from the Workspace and drop it into the Segment Grammar panel.
• In the Segment Grammar panel, click Insert Segment Group. The New Segment Group window appears.
• Type ResultGroup and click OK. This creates a segment group named ResultGroup. You will use this group to process a result group, which is a collection of one OBR segment and one or more OBX segments.

Creating a New Segment Group

• In the Segment Grammar panel, select the ResultGroup group that you just created.
• Select the Repeating check box.
• Drag the OBR and OBX segments from the Workspace and drop them into the ResultGroup folder.
• In the Segment Grammar panel, select the OBX segment and the Repeating check box.

When you are finished, the Segment Grammar should look like this:

Completed Segment Grammar

	The segment grammar notation displayed at the bottom of the Message Grammar window should match the grammar listed at the beginning of this tutorial: MSH PID {OBR {OBX}}.