This assay has high sensitivity and excellent specificity for detection of Casein Beta. No significant cross-reactivity or interference between Casein Beta and analogues was observed. Sample types: breast milk and other biological fluids. Range: 78-5,000 ng/mL. Sensitivity: 33 ng/mL. Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Casein Beta were tested 20 times on one plate, respectively. Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Casein Beta were tested on 3 different plates, 8 replicates in each plate.CV (%) = SD/meanX100;Intra-Assay: CV<10%;Inter-Assay: CV<12%. Time: 3 hours