V2.8.2 Proposal for OM4-1
Background and justification,
Figure 1 show the base 2.8.1 definition and how the OM4-1 definition is inconsistent with a
repeating segment since there is a one to many relationship between OM1-1 and OM4-1, OM4-1
cannot be unique for each repeat as defined.
In EDOS we identified this issue and came to this resolution, but it is not conformant with the
base standard…We propose changing the base to fit the message structure. See word document for the
actual text we propose in the standard.
8.1.11
OM4 - Observations That Require Specimens Segment
The Technical Steward for the OM4 segment is Orders and Observations.
This segment applies to observations/batteries that require a specimen for their performance. When an
observation or battery requires multiple specimens for their performance (e.g., creatinine clearance requires
a 24-hour urine specimen and a serum specimen), multiple segments may be included, one for each
specimen type.
OM4 is a repeating segment. It allows multiple specimens per Order Code and accommodates for multiple
alternate specimen for each preferred specimen. In some cases an Order Code can require multiple
specimens. In many cases there are preferred specimens and for each preferred it is possible to have one or
more alternative specimens. The alternative specimen will carry in OM4-17 the Sequence Number –
Test/Observation Master File (OM4-1) of the preferred specimen.
HL7 Attribute Table - OM4 - Observations that Require Specimens
SEQ
LEN
1
2
1..1
3
1..60
4
C.LEN
DT
OPT
RP/#
4=
NM
O
ID
O
60=
TX
O
Y
NM
O
Y
TBL#
0170
ITEM #
ELEMENT NAME
00586
Sequence Number - Test/Observation Master File
00642
Derived Specimen
00643
Container Description
00644
Container Volume
SEQ
DT
OPT
RP/#
TBL#
ITEM #
ELEMENT NAME
5
CWE
O
Y
9999
00645
Container Units
6
CWE
O
9999
00646
Specimen
7
CWE
O
0371
00647
Additive
8
TX
O
00648
Preparation
9
TX
O
00649
Special Handling Requirements
10
CQ
O
00650
Normal Collection Volume
11
CQ
O
00651
Minimum Collection Volume
12
TX
O
00652
Specimen Requirements
ID
O
00653
Specimen Priorities
14
CQ
O
00654
Specimen Retention Time
15
CWE
O
0376
01908
Specimen Handling Code
16
ID
O
0920
03311
Specimen Preference
17
NM
O
03312
Preferred Specimen/Attribture Sequence ID
18
CWE
O
01539
Taxonomic Classification Code
13
LEN
C.LEN
1..1
8.1.11.1
(NM) 00586
Y
Y
Y
0027
9999
OM4-1 Sequence Number - Test/Observation Master File
Definition:
The OM4-1 contains a numeric value that indicates a unique set of OM1, OM2, OM3 and OM4
components; each OMn-1 in a set will have the same value as illustrated in the example below. Because the
OM4 segment can repeat, but needs to have a unique number for use with OM4-17, the sequence number
must be appended with a sequence number as shown in the second example below:
OM4-1 Sequence Number - Test/Observation Master File Example:
MSH|...<cr>
// start MFE Test Begin group
MFE|A|...<cr>
OM1|1|...<cr>
OM2|1|...<cr>
OM3|1|...<cr>
OM4|1|...<cr>
// end MFE Test Begin group
// start MFE_Test_Begin group
MFE|A|...<cr>
OM1|2|...<cr>
OM2|2|...<cr>
OM3|2|...<cr>
OM4|2.1|...<cr>
OM4|2.2|...<cr>
//end MFE_Test_Begin group