At the beginning of conception, it is not possible to see the fertilized egg through ultrasound examination, but a pregnancy test stick or paper can be used to roughly determine whether pregnancy has occurred by measuring the composition of urine. Although this detection method has some errors, its accuracy is still quite high. However, what will be displayed if the pregnancy test stick expires?
Firstly, the distance between the pregnancy test stick and the human chorionic gonadotropin in urine is quite simple. The test strip reacts with the human chorionic gonadotropin in urine, and the color change is used to determine whether pregnancy has occurred. Generally, there is no such hormone in urine when pregnancy is not present. Even if the pregnancy test stick expires, it may not completely fail, so it is still possible for it to react with this hormone in urine and detect pregnancy. Of course, the detected color may be slightly lighter.
Secondly, if the test strip in the pregnancy test stick has completely expired. Even if there is human chorionic gonadotropin in the urine, there is no response, and only one test result will be displayed, which is that there is no pregnancy.
In short, even if the pregnancy test has expired, there are only two test results, pregnancy and non pregnancy, and generally no other reaction results will appear. In addition, the accuracy of expired pregnancy test strips will be greatly reduced, so it is recommended not to use expired pregnancy test strips as much as possible, and to store them according to the correct storage method.
