In most cases Prader-Willi starts to show symptoms in infants. Usually the most obvious is very loose muscles and skin, almost flabby looking. One way to test and make 100% sure you or your child is Prader-Willi positive is to take a test. The second way of diagnosing is with a 'FISH' (fluorescent in situ hybridization), but this way can only identify those who have the deletion of chromosome 15. The final way for diagnoses is to take a Methylation analysis, this will identify all types of Prader-Willi.
"Prader-Willi Syndrome Diagnosis & Treatments | Foundation for Prader-Willi Research." Foundation for Prader-Willi Research |. Web. 12 Mar. 2011. <http://www.fpwr.org/prader-willi-syndrome-diagnosis-treatments>.
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