Pregnancy test strips that show a double red line representing elevated human chorionic gonadotropin in the urine are usually indicative of pregnancy. Pregnancy test is a tool used by women to detect early pregnancy. Pregnancy test strips are used to detect the value of human chorionic gonadotropin in the urine to determine whether or not you are pregnant. Generally, a single red line means that you are not pregnant, while a double red line means that you are pregnant. The accuracy of pregnancy test paper has some error, you can check the blood level of human chorionic gonadotropin to determine whether you are pregnant or not. Pregnancy test paper shows a double red line, is not certain that the intrauterine pregnancy, need to improve the uterine adnexa ultrasound examination to clarify whether it is intrauterine pregnancy. And gestational trophoblastic diseases such as chorionic carcinoma, choriocarcinoma, etc., will also appear in the blood and urine of human chorionic gonadotropin significantly increased, manifested in the pregnancy test paper shows a double red line situation. People whose pregnancy test paper shows a red line with a double bar should go to a regular hospital in time to complete the relevant examinations to determine whether the pregnancy is intrauterine.