Solid Phase Assays
In addition to HLA typing, patients are screened for HLA antibodies. Panel reactivity antibody (PRA) indicates the degree of reactivity of tested serum in terms of percent of positive reactions when tested against a panel of known HLA phenotypes.
For positive results, the report will define the detected HLA antibody specificities. For negative results, 0% PRA will be reported.
*Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect specimen in a red top (preferred) or SST tube. Send intact specimen at room temperature. Do not refrigerate or freeze.
The Class I & II screening assay is performed first and detects the presence/absence of HLA antibodies. If the screening assay is positive, a high specificity and sensitivity single HLA Antigen assay will be performed to identify the specificity of the anti-HLA antibody present in the serum sample from the recipient. By ordering this test the clinician acknowledges that additional reflex testing will be performed and billed at a separate additional charge if indicated.