The Ms.Tellme Pregnancy Test Kits detect a hormone in the urine that the body produces during pregnancy – hCG (human chorionic gonadotropin). The amount of pregnancy hormone increases as pregnancy progresses. However, the test can be performed anytime of the day and as early as the first day of missing the period as it is capable of detecting the presence of 25mIU/ml of hCG in the urine.The box contains a dropper and a cassette where you have to urinate into a container and transfer 4 drops of urine using the dropper provided into the cassette well.