Quantitative colorimetric assay. This assay has high sensitivity and excellent specificity for detection of Family With Sequence Similarity 19, Member A5 (FAM19A5). No significant cross-reactivity or interference between Family With Sequence Similarity 19, Member A5 (FAM19A5) and analogues was observed. Sample types: cell lysates, tissue homogenates. Range: 78 - 5000 pg/ml. Precision: Intra-Assay: CV<10% / Inter-Assay: CV<12%. Time: 3 hours