Human Casein Alpha ELISA Kit is a sandwich ELISA kit for use with Breast milk. This assay has high sensitivity and excellent specificity for detection of Casein Alpha (CSN1). No significant cross-reactivity or interference between Casein Alpha (CSN1) and analogues was observed. Please note that this kit is also available as a CLIA Kit. Quantitative Colorimetric Sandwich ELISA. Sample Types: breast milk. Range: 1.56 ng/ml - 100 ng/ml. Sensitivity: < 0.55 ng/ml