Human Kallistatin/Serpina4 PicoKine® Quick ELISA Kit (90 minutes, 96 Tests) . Quantitate Human SERPINA4 in cell culture supernatants, cell lysates, serum and plasma (heparin, EDTA) . Sensitivity: 10pg/ml. The brand Picokine indicates this is a premium quality ELISA kit. Each Picokine kit delivers precise quantification, high sensitivity, and excellent reproducibility. Only our most reliable and effective kits qualify as Picokine, guaranteeing top-tier results for your assays.