AlloMap® Testing Overview
The AlloMap test is a 20-gene real-time quantitative polymerase chain reaction (qRT-PCR) assay. AlloMap testing applies a proprietary mathematical algorithm that combines the gene expression values from genes associated with cardiac allograft rejection to generate an objective, actionable score. Results are reported as an AlloMap score - an integer ranging from 0 to 40. Compared with patients in the same post-transplant period, the lower the score, the lower the probability of acute cellular rejection (ACR) at the time of testing.
The AlloMap Report is delivered via fax to the treating physician, who interprets it in light of the patient’s clinical assessment and other test results. After testing, XDx bills the medical center or patient's insurer directly.
The AlloMap test is performed at the CLIA-certified XDx Reference Laboratory in Brisbane, California.








