WASHINGTON - Gay men remain banned for life from donating blood, the government said Wednesday, leaving in place — for now — a 1983 prohibition meant to prevent the spread of HIV through transfusions. The Food and Drug Administration reiterated its long-standing policy on its Web site Wednesday, more than a year after the Red Cross and two other blood groups criticized the policy as “medically and scientifically unwarranted.” “I am disappointed, I must confess,” said Dr. Celso Bianco, executive vice president of America’s Blood Centers, whose members provide nearly Before giving blood, all men are asked if they have had sex, even once, with another man since 1977. Those who say they have are permanently banned from donating. The FDA said those men are at increased risk of infection by HIV that can be transmitted to others by blood transfusion. In March 2006, the Red Cross, the international blood association AABB and America’s Blood Centers proposed replacing the lifetime ban with a one-year deferral following male-to-male sexual contact. New and improved tests, which can detect HIV-positive donors within just 10 to 21 days of infection, make the lifetime ban unnecessary, the blood groups told the FDA. In a document posted Wednesday, the FDA said it would change its policy if given data that show doing so wouldn’t pose a “significant and preventable” risk to blood recipients. “It is a way of saying, ‘Whatever was presented to us was not sufficient to make us change our minds,”’ Bianco said.