CAUSES OF HIGH AMMONIA. Ammonia is a normal by-product of processing nitrogen in the body, and is excreted as waste in the urine, in healthy people. However, elevated blood ammonia levels can occur when the kidneys or liver are not working properly, allowing this waste to remain in the bloodstream, which can be poisonous to your cells.
Spina bifida research scientists are looking at a possible genetic cause of spina bifida. The goal of this research is to find the genetic factors that make some children more susceptible to neural tube defects than others.
Neurofibromatosis type 1 (NF1) is caused by a change in the NF1 gene, which is found on chromosome 17. Some people have features of NF1 that are limited to only one part of their body. This is called mosaic NF1 (also called segmental NF1). Mosaic NF1 is caused by changes in the NF1 gene, but genetic testing for people with this form of NF1 can be more complicated than for people who do not have a mosaic form of NF1.