a simple , rapid and highly specific method by selected ion monitoring ( sim ) , using 9 alpha , 11 alpha- [ 2h2 ] estrone , [ 2,4-2h2 ] estradiol-17 beta and 2,4- [ 2h2 ] estriol as internal standards , was developed for the determination of serum estrogens during pregnancy .
C0014912
estradiol-17 beta
C0032961
pregnancy