Cayman Alphaspinasterol; Purity- Greater Than Or Equal To 95%;

Estriol-d₂ is intended for use as an internal standard for the quantification of estriol (Item No. ) by GC- or LC-MS. Estriol is a metabolite of estradiol (Item Nos. | ) and a major estrogen produced in the later stages of pregnancy. In a longitudinal study in healthy pregnant women, total plasma estriol levels increased from <10 ng/ml at 8-10 weeks gestation to approximately 150 ng/ml at week 38. The majority of the estriol synthesized in the later stages of pregnancy originates from fetal dehydroepiandrosterone sulfate (DHEAS; Item No. ) and serves as a direct marker of fetal adrenal gland activity. Saliva contains primarily unbound and unconjugated estriol and is commonly used for monitoring estriol levels.^, Plasma levels of estriol in males and non-pregnant females is less than 2 ng/ml.

WARNING This product is not for human or veterinary use.