Wondfo One Step HCG Urine Test is a rapid pregnancy test which you can easily carry out yourself. It detects the presence of human chorionic gonadotropin (HCG), which appears in urine very early during pregnancy. Pregnancy Test Cassette format uses a dropper to dispense urine drops into a pregnancy test. This method allows you to write on the cassette window and keep track of your results. Product Expiration Date : 10/27/2008