EurekAlert! -- NEW YORK, NY (March 25, 2009) – Transdermal delivery of estrogen therapy available by prescription “seems not to alter” the risk of venous thromboembolism (VTE), or blood clotting, in postmenopausal patients when compared to oral delivery, a new study suggests. The study was conducted by researchers at NYU Langone Medical Center and was published in the latest issue of Menopause: The Journal of the North American Menopause Society.