Is there a test for nf?

Yes. Nf ( neurofibriomatosis ) is a inherited genetic disease , could be tested even in unborn if one of the parent has ii , from amniocentesis.
Prenatal tests. There are prenatal genetic tests for neurofibromatosis. While test results can provide very important information for future parents. Genetic tests available today can be performed only when there is a family history of nf; prenatal tests include chorionic villus sampling can be performed at 10 weeks gestation. Amnioncentesis is performed at 16 weeks.