Welch Allyn Connectivity Server - Programmers guide - Manual (Page 15)

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HL7 standard protocols
This chapter describes basic HL7 data structure as outlined in the Health Level Seven
Messaging Standard.
Information in this chapter is organized as follows:
Health Level Seven Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
HL7 low-level protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
HL7 segment-level protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Health Level Seven Standard
The Welch Allyn HL7 Interface option closely follows the data structure outlined in the
Health Level Seven Version 2.4 Messaging Standard.
The following excerpt is taken from section 7.3 and section 7.4 of this standard:
“Many report headers (OBR) may be sent beneath each patient segment, with many
separate observation segments (OBX) beneath each OBR. Note segments (NTE) may be
inserted after any of the above segments. The note segment applies to the entity that
immediately precedes it, i.e., the patient if it follows the PID segment, the observation if it
follows the OBR segment, and the individual result if it follows the OBX segment.”
One result segment (OBX) is transmitted for each vitals component (such as Heart rate or
RR/BR).
For updated information regarding this standard, see www.hl7.org/ .