plasma atrial natriuretic peptide levels in normal pregnant women showed a gradual increase as pregnancy advanced , but the mean ( +/- sd ) concentrations in women in each trimester ( 34.8 +/- 14.7 pg/ml in the first trimester , n = 35 ; 38.7 +/- 12.2 pg/ml in the second trimester , n = 34 ; and 43.1 +/- 20.0 pg/ml in the third trimester , n = 71 ) did not differ statistically from the mean plasma atrial natriuretic peptide level in nonpregnant women ( 38.2 +/- 13.6 pg/ml , n = 44 ) .
C0032961
pregnancy
C0032981
third