1. : a theory in geology: the lithosphere of the earth is divided into a small number of plates which float on and travel independently over the mantle and much of the earth's seismic activity occurs at the boundaries of these plates. 2.
Sperm DNA Fragmentation Test. The genetic integrity of the sperm is crucial for successful fertilization and normal embryo development. Sperm DNA fragmentation is a term used to denote when the genetic material within the sperm is abnormal, which in turn may lead to male subfertility and IVF failure.s a second generation sperm DNA test. It detects the sperm with DNA damage and also tells how much DNA damage each sperm have. A SpermComet test result of 45% means that there is an average of 45% damage in each sperm that was assessed.
WHO (Edition 5) states that men with 4% normal sperm are considered to have normal sperm morphology. This is a topic that elicits much discussion among the experts, and is rather controversial. For Kruger Strict criteria, which is the method used by the Cryobank, sperm classified as borderline normal sperm are scored abnormal. Based on Kruger analysis men with 14% morphologically normal sperm are considered normal. The shape of the sperm is a reflection of proper sperm development (spermatogenesis) in the testicles. Men with defective spermatogenesis may produce a high percentage of abnormal sperm. There are many factors that can lead to formation of abnormal sperm.