The Rapid Response® LH Ovulation Test Strip is a rapid, qualitative test for the determination of luteinizing hormone in human urine specimens, to aid in the detection of ovulation. It is intended for in vitro diagnostic use only. Interpretation of test results are: positive (two lines where the Test line is the same as or darker than the Control line), negative (two lines with a lighter Test line or one line), invalid (no lines or no Control line).