OBJECTIVE To study a new assay for enhancing the sensitivity of the gold immunochromatographic assay quickly by Au nanoparticles. METHODS The urine human chorionic gonadotropin hormone (HCG) was qualitative detected by gold immunochromatographic assay ( GICA). Based on this, the reaction bands of GICA were treated by modification solution, bound the colloidal gold prepared by NH 2 OH·HCl and HAuCl 4 and the sensitivity was evaluated pre-post enhancing test. RESULTS The sensitizing reagent that prepared by N...