82499-5

LOINC code 82499-5 identifies "TRBV4 gene segments/TRBV gene segments.total in Blood". This assay represents the fraction of T-cell receptor beta chain variable gene segments that are in the TRBV4 gene family out of the total number of TRBV gene segments identified ("diversity ratio"). At the time this term was created, TRBV4 included the following gene segments: TRBV4-1, TRBV4-2, and TRBV4-3. Because some portion of TRBV gene segments that are counted in the total will not correspond to any of the probes and therefore will not be identified as belonging to a specific TRBV gene family, the total of the diversity ratios reported will not equal 100%.

This code measures TRBV4 gene segments/TRBV gene segments.total in Bld. It belongs to the MOLPATH class in the LOINC classification.

LOINC (Logical Observation Identifiers Names and Codes) is a universal standard for identifying laboratory and clinical observations. It is maintained by the Regenstrief Institute and used worldwide for health data exchange.