Testing blood supply for hep b started about 1972. Testing hep c
started in 1992. Arguably you received your blood transfusions
after the test dates (or not). Any other risk factors, e.g. Men having sex
with men, tattoos
(if at all not sterile needle and fresh sterile ink), IV or nasal drug use, multiple sex partners warrant test. Cdc sugg test born 1945-65.