Quantitative colorimetric assay. This assay has high sensitivity and excellent specificity for detection of Programmed Cell Death Protein 1 Ligand 1 (PDL1). No significant cross-reactivity or interference between Programmed Cell Death Protein 1 Ligand 1 (PDL1) and analogues was observed. Sample types: plasma, serum, tissue homogenates. Range: 0.312 - 20 ng/ml. Precision: Intra-Assay: CV<10% / Inter-Assay: CV<12%. Time: 3 hours