An object of the present invention is to provide a method for assisting prediction of the time to the arrival of labor in the vaginal delivery, and a biomarker that can be used to detect such time. Although blood (such as serum) did not become clear, P-LAP levels in urine increased with the progress of pregnancy in pregnant women's urine were observed at week 35 pregnancy or at week 36 or later. It has been found that labor will come after a certain number of days following the lowering of P-LAP levels in urine. The present invention can objectively predict the time to the occurrence of labor. It was also found that the degree of decrease (width) of P-LAP after this peak is proportional to the intensity of labor, and it was also apparent that the small decrease width results in weak labor. The present invention also makes it possible...

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