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LOINC Code 77635-1: C9orf72 gene GGGGCC repeats Molgen (Bld/Tiss) [Entitic number]

77635-1 is a LOINC code used to identify C9orf72 gene GGGGCC repeats Molgen (Bld/Tiss) [Entitic number] 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 C9orf72 gene.GGGGCC repeats. 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 C9orf72 gene.GGGGCC repeats. 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: Both
  • Method: Molgen

What it does not mean

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

Key facts

C9orf72 gene GGGGCC repeats [Entitic number] in Blood or Tissue by Molecular genetics method
C9orf72 gene.GGGGCC repeats
Used to report the number of hexanucleotide GGGGCC repeats in a non-coding sequence of the C9orf72 gene. This mutation is associated with 9p-linked ALS (amyotrophic lateral sclerosis) and FTD (frontotemporal dementia).[PMID21944778] The normal number of the hexanucleotide repeats is typically 30,[PMID: 22808918] but in patients with the mutation, the repeat can occur in the order of hundreds.[PMID: 22399793]
ALS; ALSFTD; Amyotrophic lateral sclerosis; Blood; C9orf72 GGGGCC; C9orf72 GGGGCC Rpt; chromosome 9 open reading frame 72; Entitic; Entitic number; Frontotemporal dementia; FTD; FTDALS; FTDALS1; Genetics; Heredity; Heritable; Inherited; Molecular genetics; Molecular pathology; MOLPATH; MOLPATH.NUCREPEAT; PCR; Point in time; QNT; Quan; Quant; Quantitative; Random; Repeat; Tissue; Tissue, unspecified; 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

C9orf72 gene GGGGCC repeats Molgen (Bld/Tiss) [Entitic number]C9orf72 gene GGGGCC repeats [Entitic number] in Blood or Tissue by Molecular genetics methodC9orf72 GGGGCC Rpt EntNum Bld/TC9orf72 gene.GGGGCC repeatsMOLPATH.NUCREPEATC9orf72 gene GGGGCC Repeats, Blood or tissue specimenEntNum

Frequently asked questions

Code details

Code77635-1
SystemLOINC
Display nameC9orf72 gene GGGGCC repeats Molgen (Bld/Tiss) [Entitic number]
DescriptionC9orf72 gene.GGGGCC repeats
Short nameC9orf72 GGGGCC Rpt EntNum Bld/T
ComponentC9orf72 gene.GGGGCC repeats
PropertyEntNum
TimingPt
System (specimen)Bld/Tiss
ScaleQn
MethodMolgen
ClassMOLPATH.NUCREPEAT
Example unitsGGGGCC repeats
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.52
Last changed2.52

Consumer names

C9orf72 gene GGGGCC Repeats, Blood or tissue specimen

Part names

C9orf72 gene.GGGGCC repeatsEntNumPtBld/TissQnMolgenC9orf72 gene GGGGCC repeatsEntitic numberPoint in time (spot)Blood or TissueMolecular genetics

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.