The Molecular Microscope Diagnostic System is also known as MMDx and is a Laboratory Developed Test that uses a GeneChip Custom Microarray to measure mRNA transcript levels in biopsies along with extensive big data derived from individuals and populations. The system combines these technologies to deliver objective and reproducible transplant biopsy assessments on a molecular level. MMDx complements conventional biopsy processing to improve the assessment of rejection and injury in transplanted organs.