NEW YORK (Reuters Health) - Levels of the male sex hormone testosterone in infant boys who are conceived using an assisted fertility technique called intracytoplasmic sperm injection (ICSI) are significantly lower than in their naturally conceived counterparts, according to Danish researchers.ICSI is the main method used to overcome male infertility. With ICSI, a single sperm is injected directly into a single egg. If successful fertilization occurs, the embryo is then placed into the female to undergo development as usual.
