title: Thromboplastic activity in amniotic fluid during pregnancy.
abstract: Thromboplastic activity of amniotic fluid (TAAF) was determined in 97 normal and pathologic pregnancies using a modification of Quick's one-stage method for prothrombin time. It was shown that amniotic fluid (AF) has thromboplastic activity. This activity was found to increase with the progression of pregnancy, showing a very high correlation coefficient (r = -0.86). In cases of pathologic pregnancies such as those associated with diabetes, toxemia, IUGR, and Rh incompatibility, the values of TAAF do not differ from normal pregnancies. However, in 7 of 10 cases of postmature pregnancies the TAAF was below 45 seconds while no preterm or term pregnancy showed TAAF of less than 45 seconds.
mesh_terms: D000653:Amniotic Fluid / Q000378:metabolism*; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000378:metabolism; D013925:Thromboplastin / Q000378:metabolism*
chemical_list: D013925:Thromboplastin