<unk>  is the sampling of a<unk> <unk>  of an oocyte. It was first applied clinically in humans in 1987 after extensive animal studies. A<unk> <unk>  is a small haploid cell that is formed concomitantly as an egg cell during oogenesis, but which generally does not have the ability to be fertilized. After sampling of a<unk> <unk> , subsequent analysis can be used to predict viability and pregnancy chance of the oocyte, as well as the future health of a person resulting from such a pregnancy. The latter use makes it a form of preimplantation genetic screening (PGS). Compared to a blastocyst biopsy, a<unk>  can potentially be of lower costs, less harmful side-effects, and more sensitive in detecting abnormalities.
Polar body biopsy
Needle-localized biopsy
Vitreology
Open biopsy
Dermatopathology
DNA profiling
Tissue typing
Lymph node biopsy