Parishes in Louisiana. Louisiana is divided into 64 parishes, in the same way that 48 of the other states of the U.S. are divided into counties (Alaska is divided into boroughs and census areas). Types of local government. Parishes: Parishes are Louisiana's equivalent to counties in most states.
The types of tests and how they work are reviewed in the following links: 1  The Genetics of Prader-Willi Syndrome: An Explanation for the Rest of Us. 2  Gene Tests-Gene Clinics: Prader-Willi Syndrome has lots of fairly academic information on inheritance, genes, genetic testing, and prenatal testing.
The mainstay of diagnosis is genetic testing, specifically DNA-based methylation testing to detect the absence of the paternally contributed PraderâWilli syndrome/ Angelman syndrome (PWS/AS) region on chromosome 15q11-q13. Such testing detects over 97% of cases.