Human IL-8/Interleukin-8/CXCL8 ELISA Kit PicoKine® (96 Tests) . Quantitate Human CXCL8 in cell culture supernatants, serum and plasma (heparin, EDTA, citrate) . Sensitivity: 1pg/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.