What Does a Single Line in the C Area of a Pregnancy Test Stick Mean?

1. A negative reaction in the C zone of a pregnancy test stick may indicate that the person is not pregnant. A pregnancy test stick is a tool for women to detect whether they are pregnant, utilizing the double antibody sandwich principle to qualitatively or semi-quantitatively detect chorionic gonadotropin in urine to determine the success of pregnancy.

2. Pregnancy test sticks are divided into two zones: the T zone and the C zone, where the former is the reaction zone and the latter is the control zone. If only the C zone has a red line and the T zone does not change, it is a negative result, which may indicate an unsuccessful pregnancy. If both zones show red or if the T zone has a lighter color, it is a positive result, which may indicate a successful pregnancy.

3. It should be emphasized that pregnancy test sticks are not 100% accurate. During early pregnancy, when the level of chorionic gonadotropin in urine is low, a false negative result may occur. If menstruation has been missed for more than 10 days this month, it is recommended to seek medical attention for a blood chorionic gonadotropin test to confirm pregnancy. If diagnosed with a successful pregnancy, regular prenatal checkups should be scheduled.