LOINC Code 62320-7: T-cell receptor excision circle NAA+probe (DBS) [#/Vol]

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 T-cell receptor excision circle. It is commonly used with the system or sample type Bld.dot.

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: Probe.amp.tar

What it does not mean

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

Key facts

• T-cell receptor excision circle [#/volume] in DBS by NAA with probe detection
• T-cell receptor excision circle
• In newborn screening laboratories where dried blood spots (DBS) are the only available specimens, the test for T cell receptor excision circles (TREC) has been established as a reliable method in population-based pilot studies. TRECs are circular episomal DNA generated at the rearrangement of T cell antigen-receptor gene segments during maturation of T lymphocytes in the thymus. They are non-replicating byproducts that stay in the recent thymic emigrants in the peripheral blood. As such, they can serve as sensitive markers of T cell production in the newborn infant.
• #; 3 Self-Sustaining Sequence Replication; 3SR SR; ABS; absolute; absolutes; Amplif; Amplification; Amplified; Blood; Chemistry; Cnt; Count; Count/volume; CT; DBS; DNA NUCLEIC ACID PROBE; DNA probe; Dried blood spot; Filter paper; FP; LAT; LCR; Ligase chain reaction; Ligation-activated transcription; NAA+probe; NAAT; NASBA; Nucleic acid sequence based analysis; Number concentration; Number Concentration (count/vol); PCR; Point in time; Polymerase chain reaction; Probe amp; Probe with ampification; Probe with target amplification; QBR; QNT; Quan; Quant; Quantitative; Random; Rec; Recept; Receptors; Recp; Recptr; SDA; Strand Displacement Amplification; T cell; T prime; TMA; Transcription mediated amplification; TREC; UCHL-1; Viral load; WB; Whole blood

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.

Related SNOMED CT concepts

Related observations and tests

Common synonyms

Frequently asked questions