Monozygotic twins and triplets in association with blastocyst transfer.

Purpose: To compare the incidence of monozygotic twins following blastocyst versus day-3 embryo transfer (ET).

Methods: A retrospective analysis of the outcome of assisted reproductive technology (ART) cycles utilizing blastocyst ET during 1999-2000 was compared to a similar group of patients undergoing day-3 ET during 1997-1998.

Results: Blastocyst ET was used in 75 cycles with 2.

Pregnancy in the sixth decade of life: obstetric outcomes in women of advanced reproductive age.

Context: As a result of oocyte donation, women in their sixth decade of life are now able to conceive and carry pregnancies to term. However, little is known about pregnancy outcomes in this population.

Objective: To describe pregnancy outcomes in women aged 50 years or older who conceived after in vitro fertilization with donor oocytes.