The two bars of the pregnancy test stick are positive to indicate pregnancy. At present, the widespread early pregnancy diagnostic test paper is convenient and quick, but there is a certain rate of false positives and false negatives, which can be avoided by repeated testing. Specific operation steps: keep the morning urine of the woman being tested, insert the end of the early pregnancy diagnostic test strip with reagent marked MAX into the urine, the urine line must not cross the MAX line, and the result can be observed in 1-5 minutes, and the result is invalid after 10 minutes. Judgment of the result: only at the upper end of the white display area, presenting a red line is negative; two red lines above and below the white display area are positive indicating early pregnancy. The test paper reaction line can show changes in color shades depending on the amount of HCG concentration contained in the specimen. The absence of a red line at the upper end of the test paper strip indicates test paper failure or test method failure, and this method can detect the minimum amount of HCG in urine as 25U/L.