The Technical Steward for the OM1 segment is Orders and Observations.

The OM1 segment contains the attributes that apply to the definition of most observations. This segment also contains the field attributes that specify what additional segments might also be defined for this observation.

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C.LenElementv2.8.2
1-4=NMR1-00586OM1-1Sequence Number - Test/Observation Master File
2--CWER1-00587OM1-2Producer's Service/Test/Observation ID
32..3-IDO*012500588OM1-3Permitted Data Types
41-IDR1013600589OM1-4Specimen Required
5--CWER1063100590OM1-5Producer IDTable
6-200#TXO1-00591OM1-6Observation Description
7--CWEO*063200592OM1-7Other Service/Test/Observation IDs for the ObservationTable
8-200#STB*-00593OM1-8Other Names
9-30#STO1-00594OM1-9Preferred Report Name for the Observation
101..8-STO1-00595OM1-10Preferred Short Name or Mnemonic for the Observation
11-200=STO1-00596OM1-11Preferred Long Name for the Observation
121-IDO1013600597OM1-12Orderability
13--CWEO*063300598OM1-13Identity of Instrument Used to Perform this StudyTable
14--CWEO*063500599OM1-14Coded Representation of MethodTable
151-IDO1013600600OM1-15Portable Device Indicator
16--CWEB*063600601OM1-16Observation Producing Department/SectionTable
17--XTNB1-00602OM1-17Telephone Number of Section
181-CWER1017400603OM1-18Nature of Service/Test/Observation
19--CWEO1063700604OM1-19Report SubheaderTable
20-20=STO1-00605OM1-20Report Display Order
21--DTMO1-00606OM1-21Date/Time Stamp for Any Change in Definition for the Observation
22--DTMO1-00607OM1-22Effective Date/Time of Change
23--NMB1-00608OM1-23Typical Turn-Around Time
24--NMO1-00609OM1-24Processing Time
251-IDO*016800610OM1-25Processing Priority
261-IDO1016900611OM1-26Reporting Priority
27--CWEB*063800612OM1-27Outside Site(s) Where Observation May Be PerformedTable
28--XADB*-00613OM1-28Address of Outside Site(s)
29--XTNB1-00614OM1-29Phone Number of Outside Site
30--CWEO1017700615OM1-30Confidentiality Code
31--CWEB*063900616OM1-31Observations Required to Interpret this ObservationTable
32--TXO1-00617OM1-32Interpretation of Observations
33--CWEO*064000618OM1-33Contraindications to ObservationsTable
34--CWEO*064100619OM1-34Reflex Tests/ObservationsTable
35--TXO*-00620OM1-35Rules that Trigger Reflex Testing
36--CWEO*064300621OM1-36Fixed Canned MessageTable
37-200=TXO*-00622OM1-37Patient Preparation
38--CWEO1064400623OM1-38Procedure MedicationTable
39-200=TXO1-00624OM1-39Factors that may Affect the Observation
40-60=STO*-00625OM1-40Service/Test/Observation Performance Schedule
41--TXO1-00626OM1-41Description of Test Methods
42--CWEO1025400937OM1-42Kind of Quantity Observed
43--CWEO1025500938OM1-43Point Versus Interval
44-200=TXO1025600939OM1-44Challenge Information
45--CWEO1025800940OM1-45Relationship Modifier
46--CWEO1064500941OM1-46Target Anatomic Site Of TestTable
47--CWEO1091000942OM1-47Modality of Imaging Measurement
481-IDO1091903310OM1-48Exclusive Test
492..3-IDO1007400257OM1-49Diagnostic Serv Sect ID
50--CWEO1-01539OM1-50Taxonomic Classification Code
51..200-STO*-03399OM1-51Other Names
52--CWEO*064603433OM1-52Replacement Producer's Service/Test/Observation IDTable
53--TXO*-03434OM1-53Prior Resuts Instructions
54--TXO1-03435OM1-54Special Instructions
55--CWEO*-03436OM1-55Test Category
56--CWEO1064703437OM1-56Observation/Identifier associated with Producer’s Service/Test/Observation ID2
57--CQO1-03438OM1-57Typical Turn-Around Time
58--CWEO*000103439OM1-58Gender Restriction
59--NRO*-03440OM1-59Age Restriction
5