These appear to be the currently performed test for donated blood as posted by the Blood-Mobile folks:
"In the United States, at the time of this writing, before your donated Blood is made available for transfusion, it will be tested as follows:
ABO Typing - provides determination of Blood type: A, B, O, or AB.
Rh Factor Determination - indicates positive or negative Blood type.
Blood Group Antibodies - indicates unexpected antibodies that may be a result of prior transfusion, pregnancy or other factors.
Hepatitis B Surface Antigen - indicates a present infection (hepatitis) or carrier state of hepatitis B virus.
Antibody to Hepatitis B Core - additional test that detects a present or past infection with the hepatitis B virus.
Antibody to Hepatitis C Virus - indicates antibody to a virus that causes hepatitis C (responsible for non-A non-B hepatitis.) The mean incubation time is six to eight weeks.
Alanine Aminotransferase (ALT) - identifies a liver enzyme that, when increased, may indicate undetectable forms of hepatitis.
Antibody to HTLV - 1 and 2 - indicates the antibody to a virus that causes adult T-cell leukemia, among other things.
Antibody to HIV 1 and 2 - indicates an infection with Human Immune deficiency Virus.
Syphilis - screens for this dangerous venereal disease."
So it also appears that testing should demonstrate infection-free blood from homosexuals acceptable for use.