Pregnancy test stick in the morning a bar, put into the afternoon into two bars, indicating that the observation error, is caused by molecular diffusion, does not have clinical significance. The correct way to use the pregnancy test stick is to take a woman’s morning urine, put the arrow end of the stick into a cup of urine, and then observe it for 5 minutes after putting it into the cup, and read the test results in time, which is accurate at this time. If the time is long, due to the diffusion of molecules, it will make the pregnancy test stick a bar in the morning and two bars in the afternoon, then it is not allowed, does not have clinical significance. If a woman suspects that she is pregnant, the pregnancy test has a certain probability of false negatives, and at this time she should go to the hospital in time to see a doctor for blood hCG measurement, to clearly determine whether she is pregnant or not.