the plasma concentrations of 6-keto-pgf1 alpha in women with combined oral contraceptives ( 65.5 +/- 16.1 pg/ml , mean +/- sd ) was lower ( p less than 0.01 ) than that in the control subjects ( 77.4 +/- 26.4 pg/ml ) , whereas the use of combined oral contraceptives was associated with no changes in txb2 levels in plasma or serum , in women with progestogen-only oral contraceptives , the plasma levels of 6-keto-pgf1 alpha and txb2 were normal , but the capacity of the platelets to release txb2 during spontaneous clotting was decreased ( 113.6 +/- 77.6 ng/ml versus 179.9 +/- 81.9 ng/ml , p less than 0.05 ) .
C0229671
serum
C0032105
plasma