LOINC Code 21771-1: Chr 21 trisomy Cytogenetics Ql (Bld/Tiss)

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 Chromosome 21 trisomy. 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: Cytogenetics

What it does not mean

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

Key facts

• Chromosome 21 trisomy [Presence] in Blood or Tissue by Cytogenetics
• Chromosome 21 trisomy
• Arbitrary; Blood; Chr 21 Ts; Chromosom; Chromosomes; Cytog; Down syndrome; Downs; Genetics; Heredity; Heritable; Inherited; Karyotype; Molecular pathology; MOLPATH; MOLPATH.TRISOMY; Ordinal; Point in time; QL; Qual; Qualitative; Random; Screen; Tissue; Tissue, unspecified; Ts; 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

Frequently asked questions