Pregnant test paper test can not come out how to return a responsibility

There are many factors that affect the results of pregnancy test paper tests. Using this method to test pregnancy must take into account the time of pregnancy test, the concentration of urine, the accuracy of menstruation, etc.: First, the time of detection: hcg is generally a few days after the implantation of fertilized eggs, and it is only in the urine that a certain amount can be detected. Therefore, for women with regular menstruation, it is possible to detect hcg in urine after menstruation is delayed, while women with long menstrual cycles or abnormal ovulation need to stop menstruation for 40 to 44 days before they can be detected. Second, urine dilution: if you drink too much water to dilute urine, it may cause false negative results. Third, if you do early pregnancy test paper at night, the accuracy rate will be more or less affected. Because early urine generally has the highest hcg value, while the hcg content in urine at night is very low, it is generally not easy to detect. Fourth, the correct use of pregnancy test paper: pay attention to the length of urine immersion test paper when detecting, sometimes the length of urine immersion test paper is too short or too long, may make the test results show errors.