KRT88P and hepatitis B virus infection: In the results presented, it is possible to observe the importance of performing the anti-HBc test in the serological screening of hepatitis B, since in 100% of the positive results with HBsAg and anti-HBc, the viral load was detected, whereas in 100% of the positive results, with only HBsAg alone, the viral load was not detected, probably due to the 20% gray zone adopted by HEMOAM in these tests as a safety margin.