1.   They are used in medicine for the treatment of cancer and to detect thyroid gland disorders.

2.   Prenatal genetic testing, which can detect disorders such as Down syndrome or cystic fibrosis in unborn fetuses, has been available for some time.

3.   ADD is difficult to diagnose because there is no test that detects the disorder.

4.   But ADD is difficult to diagnose because there is no test that detects the disorder.

5.   Many health care professionals do not have adequate training to detect such disorders, she said.