In the US, the current guidance from the U.S. Food and Drug Administration (FDA) is to permanently defer any male donor who has had sex with another man, even only once, in the period from 1977 to the present day. In 2006, the AABB, America's Blood Centers and American Red Cross recommended to the FDA that the deferral period for men who had sex with other men should be changed to be equivalent with the deferral period for heterosexual's judged to be at risk. The FDA chose to uphold the blood ban. Female sexual partners of MSM* are deferred for one year since the last exposure. This is the same policy used for any sexual partner of someone in a high risk group. The intent of these policies is to ensure that blood is collected from a population that is at low risk for disease, since the tests are not perfect and human error may lead to infected units not being properly discarded. The policy was first put in place in 1985.
Donors of what the FDA calls "HCT/P's", a category that includes transplants (other than organs) and some reproductive tissue, notably anonymous semen donations, are ineligible for five years after the most recent contact. UNOS policies for Organ donation require the hospital receiving the organ to be notified if the donor was an MSM within the past 5 years. The organs are generally used unless there is a clear positive test for a disease.
On August 19th, 2009 the Assembly Judiciary Committee in California passed AJR13, the U.S. Blood Donor Nondiscrimination Resolution, calling upon the FDA to end the gay blood ban.