WOODBURY - Healthy women are being told they should not be routinely screened for ovarian cancer because the test can potentially do more harm than good. A federal panel of doctors has ruled that some of the tests can result in false positives, prompting unnecessary treatments or surgery. The guidelines that the panel has released say only women who have symptoms or a family history of the disease should be tested. Some ovarian cancer survivors who credit the routine test with saving their lives are denouncing the panel's findings. They are encouraging women who want to be tested to ask their doctors anyway. Ovarian cancer is the ninth most common cancer among women and it affects about one in 70.