Negative (No LH Surge): Only one color band appears on the control region, or the test band appears but is lighter than the control band.
Positive (LH Surge): If two color bands are visible, and the test band is equal to or darker than the control band.
Invalid: No visible band at all. Repeat with a new test kit.
Note: the color band of the reagent bar quality control line and the test line can show the light or dark color due to the content of LH in urine, and the results are determined according to the above standards.