LINKMED® Interface Tutorial: HL7 ADT Segments and Fields |
6.1 MSH-Message Segment Header
The MSH segment defines the intent, source, destination,
and some specifics of the syntax of a message.
|
Seq
|
Element Name
|
Req
|
Len
|
Comments
|
|
|
0 |
Segment ID (MSH) |
R |
3 |
"MSH" |
|
|
1 |
Field Separator (FS) |
R |
1 |
This is used to identify separator char “|” |
|
|
2 |
Encoding Characters |
R |
4 |
^ ~ \ & |
|
|
3 |
Sending Application (SA) |
O |
15 |
|
|
|
4 |
Sending Facility (SF) |
O |
20 |
|
|
|
5 |
Receiving Application (RA) |
O |
15 |
|
|
|
6 |
Receiving Facility (RF) |
O |
20 |
|
|
|
7 |
Date/Time of Message (TOM) |
O |
15 |
YYYYMMDDhhmm[ss] |
|
|
8 |
Security (SEC) |
O |
40 |
|
|
|
9 |
Message Type (MT) |
R |
7 |
ADT – Admit, Discharge, Transfer Message ACK – General Acknowledgment Message |
|
|
10 |
Message Control ID (MCID) |
R |
20 |
|
|
|
11 |
Processing ID (PID) |
R |
1 |
P |
|
|
12 |
Version ID (VID) |
R |
8 |
HL7 standard version being used. |
|
|
13 |
Sequence Number (SEQ) |
O |
15 |
|
|
|
14 |
Continuation Pointer |
O |
180 |
|
|
|
15 |
Accept Acknowledgment Type |
O |
2 |
AL |
|
|
16 |
Application Acknowledgment Type |
O |
2 |
AL |
|
|
17
|
County Code |
O
|
2
|
||
|
18
|
CharacterSet |
O
|
6
|
||
|
19
|
PrincipalLanguageOfMessage |
O
|
60
|
||
|
20
|
AlternateCharacterSetHandlingScheme |
O
|
20
|
||
|
21
|
MessageProfileIdentifier |
O
|
250
|
||
|
R = Required, CR = Conditionally Required, O = Optional, N = Numeric, AN = Alpha/Numeric, ID = Segment Identification |
|||||
6.2 MSA-Message Acknowledgment Segment
The MSA
acknowledges receipt of incoming messages.
|
Seq
|
Element Name
|
Req
|
Len
|
Comments
|
|
|
0 |
Segment ID (MSA) |
R |
3 |
"MSA" |
|
|
1 |
Acknowledgment Code (AC) |
O |
2 |
AA, AE or AR |
|
|
2 |
Message Control ID (MCID) |
R |
20 |
ID of the message from the sending system (MSH_10) |
|
|
3 |
Text Message (TM) |
O |
80 |
LINKMED® TCP/IP NAK Text Message |
|
|
4 |
Expected Sequence Number (ESN) |
O |
15 |
|
|
|
5 |
Delayed Acknowledgment Type (DAT) |
O |
1 |
|
|
6 |
Error Condition |
O
|
100
|
||
|
R = Required, CR = Conditionally Required, O = Optional, N = Numeric, AN = Alpha/Numeric, ID = Segment Identification |
|||||
Optional HL7 Segments for ACK/NAK=
SFT and UAC uses only with HL7 version 2.6 and above
