LOINC Code 77012-3: Chr 18 trisomy Sequencing Ql (cfDNA)

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 Fetal chromosome 18 trisomy. It is commonly used with the system or sample type Plas.cfDNA.

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
• Method: Sequencing

What it does not mean

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

Key facts

• Fetal Chromosome 18 trisomy [Presence] based on Plasma cell-free DNA by Sequencing
• Fetal chromosome 18 trisomy
• This term was created for, but is not limited in use to, Sequenom Laboratories' MaterniT21 PLUS trisomy 18 test, which analyzes circulating cell-free DNA extracted from maternal plasma for chromosome 18 aneuploidy using whole genome sequencing. MaterniT21 PLUS is indicated for use in pregnant women with increased risk for fetal chromosomal aneuploidy.
• Chr 18 Ts; Chromosom; Chromosomes; Genetics; Heredity; Heritable; high-throughput sequencing; HTS; Inherited; Molecular pathology; MOLPATH; MOLPATH.TRISOMY; Next generation sequencing; NGS; Ordinal; Pl; Plasma; Plsm; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Ts

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

Frequently asked questions