Quantitative colorimetric assay. This assay has high sensitivity and excellent specificity for detection of human GH. No significant cross-reactivity or interference between human GH and analogs was observed. Note: Limited by current skills and knowledge, it is impossible for us to complete the cross-reactivity detection between human GH and all the analogs, therefore, cross reaction may still exist. Sample types: plasma, serum. Range: 2.5 - 50 ng/ml. Precision: Intra-assay: CV%<15% Inter-assay: CV%<20%.