The FSH test paper is a qualitative check of follicle-stimulating hormone in the urine, thus indirectly determining ovarian function, and is checked 3 days before the onset of menstruation. It is to put the FSH test paper into the woman’s urine, and then according to the number of red lines on the FSH test paper, to determine the ovarian function. It mainly depends on the number of red lines and the color depth of the red lines. If there is one red line, it means that the FSH test paper is negative, which indirectly suggests that the ovarian function is at a normal level. If there are two red lines on the FSH test paper, but the other red line is lighter in color, it means that the FSH test paper is weakly positive, which also suggests that the ovarian function of the woman has declined, but she is able to secrete estrogen and progesterone and discharge eggs, so the woman will still have her menstrual period. However, if there are two red lines on the FSH test paper, and the color of the red line is particularly dark, it means that the FSH test paper is positive, which is mostly indicative of premature ovarian failure.