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The test (e.g., analyte) code configuration segment is the data necessary to maintain and transmit information concerning the test entity codes that are being used throughout the "automated system."

HL7 Attribute Table - TCC - Test Code Configuration Segment

Seq#	DataElement	Description	Must Implement	Flags	Cardinality	Length	C.LEN	Vocabulary	DataType
TCC
1	00238	Universal Service Identifier	SHALL		[1..1]			0612	CWE
2	01408	Equipment Test Application Identifier	SHALL		[1..1]				EI
3	00249	Specimen Source	SHALL NOT	W	[0..0]
4	01410	Auto-Dilution Factor Default			[0..1]				SN
5	01411	Rerun Dilution Factor Default			[0..1]				SN
6	01412	Pre-Dilution Factor Default			[0..1]				SN
7	01413	Endogenous Content of Pre-Dilution Diluent			[0..1]				SN
8	01414	Inventory Limits Warning Level		#	[0..1]		10		NM
9	01415	Automatic Rerun Allowed			[0..1]	[1..1]		0136 Yes/no Indicator	ID
10	01416	Automatic Repeat Allowed			[0..1]	[1..1]		0136 Yes/no Indicator	ID
11	01417	Automatic Reflex Allowed			[0..1]	[1..1]		0136 Yes/no Indicator	ID
12	01418	Equipment Dynamic Range			[0..1]				SN
13	00574	Units			[0..1]			0623	CWE
14	01419	Processing Type			[0..1]			0388 Processing Type	CWE
15	03313	Test Criticality			[0..1]	[705..*]			CWE

(Definition from OBR.4 in Ch. 4)

Definition: This field contains the identifier code for the requested observation/test/battery. The identifier can come from either a local coding system or industry standards. Examples may be LOINC (emerging as the global standard for observation identifiers), JLAC10, or SNOMED CT. Refer to Table 0612 - Universal Service Identifier in Chapter 2C for valid values.

(Definition from OBR.4 in Ch. 7)

Definition: This field contains the identifier code for the requested observation/test/battery. The identifier can come from either a local coding system or industry standards. Examples may be LOINC (emerging as the global standard for observation identifiers), JLAC10, or SNOMED CT. Refer to Table 0612 - Universal Service Identifier in Chapter 2C for valid values.

(Definition from OM7.2 in Ch. 8)

Definition: This field contains the producer's usual or preferred identification of the test or service.

(Definition from AIS.3 in Ch. 10)

Definition: This field contains an identifier code for a service to be scheduled. This field may contain a universal service identifier describing the observation/test/battery/procedure or other activity that is to be performed during the requested appointment, similar to the universal service identifier defined for the OBR segment in the Order Entry chapter (Chapter 4). This code can be based on local and/or universal codes. The use of universal codes is recommended.

(Definition from TCC.1 in Ch. 13)

Definition: This field identifies the test code that information is being transmitted about. The alternate elements represent the test code identifier that has been assigned by the manufacturer to this particular test code. Refer to Table 0787 - Universal Service Identifier in Chapter 2C for valid values.

(Definition from TCD.1 in Ch. 13)

Definition: This field identifies the test code that information is being transmitted about. Refer to Table 0789 - Universal Service Identifier in Chapter 2C for valid values.

Definition: This field identifies the test application code assigned by the manufacturer of the equipment or reagents and associated with performing of the particular test specified by the Universal Test Identifier.

(Definition from OBR.15 in Ch. 4)

Attention: The OBR-15 element was retained for backward compatibility only as of v 2.5 and the detail was withdrawn and removed from the standard as of v 2.7. See SPM in Chapter 7.

(Definition from OBR.15 in Ch. 7)

Attention: The OBR-15 element was retained for backward compatibility only as of v 2.5 and the detail was withdrawn and removed from the standard as of v 2.7. See SPM in Chapter 7.

(Definition from SAC.6 in Ch. 13)

Attention: This field was deprecated and retained for backward compatibilityonly as of v2.5 and withdrawn and removed as of v2.7.

(Definition from TCC.3 in Ch. 13)

Attention: As of version 2.5 this field was deprecated and retained for backward compatibility only and withdrawn as of v2.7.

Definition: This field is the value that is to be used as the default factor for automatically diluting a specimen by an instrument for this particular test code. (See examples in definition of 13.4.3.29, "SAC-29 Dilution Factor (SN) 01356" in, "Specimen Container Detail Segment.")

Definition: This field is the value that is to be used as the default factor for automatically diluting a specimen in case of rerun for this particular test code.

Definition: This field is the value that is to be used as the default factor for a specimen that is delivered to the laboratory automation system as pre-diluted for this particular test code.

(Definition from TCC.7 in Ch. 13)

Definition: This field represents a baseline value for the measured test that is inherently contained in the diluent. In the calculation of the actual result for the measured test, this baseline value is normally considered.     

(Definition from TCD.5 in Ch. 13)

Definition: This field represents the rest concentration of the measured test in the diluent. It is the value that is to be used for calculation of the concentration of pre-diluted specimens for this particular test code.

Definition: This field is the value that is to be used as the threshold for initiating inventory warning-level messages.

Definition: This field identifies whether or not automatic reruns are to be initiated on specimens for this particular test code. Refer to HL7 Table 0136 -Yes/no Indicator for valid values.

(Definition from TCC.10 in Ch. 13)

Definition: This field identifies whether or not automatic repeat testing is to be initiated on specimens for this particular test code. Refer to HL7 Table 0136 -Yes/no Indicator for valid values.

(Definition from TCD.6 in Ch. 13)

Definition: This field identifies whether or not automatic repeats are to be initiated for this particular specimen for this particular test code. Refer to HL7 Table 0136 -Yes/no Indicator for valid values.

Definition: This field identifies whether or not automatic or manual reflex testing is to be initiated on specimens for this particular test code. Refer to HL7 Table 0136 -Yes/no Indicator for valid values.

Definition: This is the range over which the equipment can produce results.

(Definition from OBX.6 in Ch. 7)

Definition: This field contains the units of measurement for the value in OBX-5, Observation Value. Coding system from which the values may be drawn include, UCUM, ISO+, ANSI X3.50 - 1986 and site specific (local) coding systems. Considering Version 3 direction and consistent use of V2 and V3 messages/documents within an organization, use of UCUM is strongly recommended. Refer to Table 0623 - Units in Chapter 2C for valid values.

Note that OBX-6 applies to both OBX-5.2 and OBX-5.4 if OBX-2 = “SN”.

(Definition from TCC.13 in Ch. 13)

Definition: This field is the units that have a data type of CWE. The default coding system for the units codes consists of the ISO+ abbreviation for a single case unit (ISO 2955-83) plus extensions, that do not collide with ISO abbreviations (see Chapter 7, section 7.4.2.6). We designate this coding system as ISO+. Both the ISO unit's abbreviations and the extensions are defined in Chapter 7, section 7.4.2.6.2 and listed in Figure 7-9. The ISO+ abbreviations are the codes for the default coding system. Consequently, when ISO+ units are being used, only ISO+ abbreviations need be sent, and the contents of the units field will be backward compatible to HL7 Version 2.1. For more information on this field see reference Chapter 7, section 7.4.2.6.

These units apply to fields "Endogenous content of pre-dilution diluent" and "Equipment dynamic range".

Refer to Table 0788 - Units in Chapter 2C for valid values.

Definition: This field identifies the processing type that applies to this test code. If this attribute is omitted, then regular production is the default. Refer to HL7 Table 0388 – Processing Type in Chapter 2C, Code Tables, for valid values.

Definition: This field identifies the test the Test Criticality. The values in this field are used for decisions, which tests should be performed, in case of, e.g., insufficient specimen volume.
The data type is CWE because its meaning is a coded value. However, in order to make the processing decisions easy the content can be a sequential number of the test sorted according to the criticality assigned by the lab. The lower numbers are more critical than higher numbers.