HCG test strips, also known as early pregnancy test strips, are designed to test the HCG hormone in urine to determine whether a woman is pregnant or not. If the HCG in blood is less than 50 IU/L, the HCG in urine will not be significantly elevated and the early pregnancy test paper will only appear negative. Since the HCG test in urine is only a qualitative but not a quantitative test, there is no way to see the specific value of HCG in urine directly, so we can only use the test paper to see if it is positive or negative, so as to determine the pregnancy situation.