Ovulation test paper C is the control line, T is the test line, look at the C area and T area display situation, determine the woman’s ovulation. After the menstrual period is clean and you start to use ovulation test paper to monitor ovulation, at first it shows a red line in the C zone as negative, which means that the ovaries are not ovulating for the time being. As the test continues, red lines appear in zones C and T. The darker color of zone C and the lighter color of zone T are weakly positive, indicating that the ovaries have almost mature follicles developing. If the two lines in zone C and T are of the same color, it means that the ovary has developed a mature follicle, but it has not yet been expelled from the body. If the color of the T-zone becomes lighter, the test is weakly positive, indicating that the ovary has begun to expel a mature follicle, and if the test becomes negative, the ovary has already ovulated. Ovulation test paper is not 100% accurate, if you want to accurately monitor ovulation, you can monitor follicle development through ultrasound.