TREC assay
Also written as: TREC — T-cell Receptor Excision Circles
A molecular test measuring T-cell receptor excision circles to screen for severe combined immunodeficiency.
Full Definition
The TREC assay (T-cell Receptor Excision Circles assay) is a quantitative PCR-based test used in newborn screening to detect severe combined immunodeficiency (SCID) and other T-cell lymphopenias. TRECs are stable DNA byproducts formed during T-cell development in the thymus. Low or absent TREC levels indicate impaired T-cell production, suggesting primary immunodeficiency disorders. The assay is performed on the same dried blood spot used for other newborn screening tests, making it an efficient addition to screening panels. This test has revolutionized early detection of SCID, enabling life-saving interventions before the onset of serious infections.
Usage
Usage note: Often capitalized as TREC when referring to the specific assay methodology.
In Context
- "The TREC assay showed undetectable levels, prompting immediate referral to immunology." — Screening result report
- "Quality control measures for the TREC assay include monitoring PCR efficiency and reagent stability." — Laboratory protocol