The most simple and economical alternative for clinical diagnostic testing. The HCG pregnancy strip is designed for rapid determination of pregnancy conditions in urine specimens. The strip is dipped into a sample for 3-5 seconds. The reaction approximately takes 5 minutes with visual development of control and test lines. One Step LH Ovulation Test is fast and easy-to-use. It is a qualitative test that can predict when there is a LH (luteinizing hormone) surge, and in turn, when you are likely to ovulate. Theyre FDA-approved, highly sensitive (detecting a level of 25 miu/ml LH), and provide a high degree of accuracy in pinpointing your most fertile time of the month.Product is manufactured from China.