Blood supply: weighing which tests stay.
Check
W A
WA
D015492:AIDS Serodiagnosis; D001782:Blood Donors; D014355:Chagas Disease / Q000175:diagnosis; D003141:Communicable Diseases / Q000175:diagnosis*; D016655:HIV Core Protein p24 / Q000032:analysis; D006525:Hepatitis, Viral, Human / Q000175:diagnosis; D006801:Humans; D013588:Syphilis Serodiagnosis