Pregnancy and live birth rates following in-vitro fertilization decline rap
idly with advancing maternal age partly because of an increase in age-relat
ed aneuploidies occurring in female meiosis. Screening oocytes or preimplan
tation embryos for common aneuploidies is now possible by polar body or cle
avage stage biopsy and multicolour fluorescence in-situ hybridization. (C)
1999 Lippincott Williams & Wilkins.