LOINCActiveObservation

LOINC Code 51958-7: Transcript reference sequence Nom (Bld/Tiss) [ID]

51958-7 is a LOINC code used to identify Transcript reference sequence Nom (Bld/Tiss) [ID] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Transcript reference sequence identifier. It is commonly used with the system or sample type Bld/Tiss.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Transcript reference sequence identifier. It is commonly used with the system or sample type Bld/Tiss.

When is it used?

  • Used in lab systems, EHRs, and clinical data exchange.
  • May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
  • Status: ACTIVE
  • Order vs observation: Observation

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

  • Transcript reference sequence [ID]
  • Transcript reference sequence identifier
  • This field carries the ID for the transcribed reference sequence, which is the part of the genomic reference sequence that is converted to messenger RNA (i.e., after the introns are removed). The transcript reference sequence ID may be reporting using various coding systems including NCBI's RefSeq ("NM_..."), Ensembl ("ENST..."), and LRG ("LRG..." plus "t1" to indicate transcript).
  • Blood; Genetic; Genetics; Genomic; Heredity; Heritable; HL7.GENETICS; Ident; Identifier; Inherited; MOLPATH.GENERAL; Nominal; Point in time; Random; Ref Sequence; RefSeq; Tissue; Tissue, unspecified; Transcript ref sequence ID; WB; Whole blood; Whole blood or Tissue

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Transcript reference sequence Nom (Bld/Tiss) [ID]Transcript reference sequence [ID]Transcript ref sequence IDTranscript reference sequence identifierHL7.GENETICSTranscript reference sequence, Blood or tissue specimenID

Frequently asked questions

Code details

Code51958-7
SystemLOINC
Display nameTranscript reference sequence Nom (Bld/Tiss) [ID]
DescriptionTranscript reference sequence identifier
Short nameTranscript ref sequence ID
ComponentTranscript reference sequence identifier
PropertyID
TimingPt
System (specimen)Bld/Tiss
ScaleNom
ClassHL7.GENETICS
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.24
Last changed2.73

Consumer names

Transcript reference sequence, Blood or tissue specimen

Part names

Transcript reference sequence identifierIDPtBld/TissNomIdentifierPoint in time (spot)Blood or Tissue

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

LOINC Code 51958-7 | HealthAssure