A test for the HIV-1/2 antibody contains an externalcontrol that did not fall into the range required. What is thecorrect procedure for this problem? Why are external controlstested?
A donor’s sample tests positive with thehemagglutination test for syphilis. The confirmatory test isnegative, and the donor’s history indicates no high-risk behavior.The donor is 68 years old and donating an autologous unit forsurgery. Can this autologous unit be used? Why or whynot?
