in this report we present data showing an increase in blood levels of this endogenous substance in pregnant women with time of gestation ( 45 +/- 12 , 125 +/- 32 , and 195 +/- 27 pg/ml digoxin-equivalent for the 1st , 2nd , and 3rd trimesters , respectively , mean +/- se ) .
C0032961
gestation
C0032981
3rd