Test strips to measure amniotic fluid are called pH test strips, which are test strips that test the acidity or alkalinity of a liquid to determine if the fluid coming out of a woman is amniotic fluid. The test paper to measure amniotic fluid is called pH test paper, which is a test strip to detect the acidity or alkalinity of the liquid. Normal pH test paper is yellow, late pregnancy female vaginal fluid outflow, doctors can use pH test paper to detect the fluid in the posterior vaginal fornix, pH test paper becomes blue, consider a premature rupture of membranes, but it is not absolute, affected by the blood, disinfectant, there may also be a false positive result. pH test paper is characterized by meeting acidic liquid can turn red, meet alkaline liquid will turn blue, according to the different degrees of acidity and alkalinity, the degree of red and blue degree is not the same, through the pH test paper colorimetric comparison card can be roughly determine the acidity of the liquid measured. Women with fluid flow in late pregnancy are advised to go to the hospital for examination and judgment to improve the accuracy.